{"id":1051,"date":"2022-03-06T17:09:04","date_gmt":"2022-03-06T17:09:04","guid":{"rendered":"https:\/\/zenith-tech.de\/?post_type=project&#038;p=1051"},"modified":"2026-09-16T21:48:02","modified_gmt":"2026-09-16T21:48:02","slug":"zenith-liquid-humic-acid-blackjack","status":"publish","type":"project","link":"https:\/\/zenith-tech.de\/en\/project\/zenith-liquid-humic-acid-blackjack\/","title":{"rendered":"ZENITH LIQUID HUMIC ACID- BLACKJACK"},"content":{"rendered":"<p>[et_pb_section admin_label=&#8221;section&#8221;]<br \/>\n\t\t\t[et_pb_row admin_label=&#8221;row&#8221;]<br \/>\n\t\t\t\t[et_pb_column type=&#8221;4_4&#8243;][et_pb_text admin_label=&#8221;Text&#8221;]<!-- ============================================================\n     ZENITH BLACKJAK \u2014 product page content  (v2, 16.09.2026)\n     Paste into WordPress: Add Block > Custom HTML  (or Elementor > HTML widget)\n\n     UPLOAD THESE 3 IMAGES TO THE MEDIA LIBRARY FIRST, THEN REPLACE THE\n     THREE PLACEHOLDERS BELOW WITH THEIR URLs:\n        IMG_BOTTLE   ->  zenith-blackjak-bottle.png\n        IMG_INK      ->  zenith-blackjak-ink.png\n        https:\/\/zenith-tech.de\/wp-content\/uploads\/2026\/09\/zenith-blackjack-research-results.png  ->  zenith-blackjack-research-results.png\n     ============================================================ --><\/p>\n<style>\n.zbj{--g:#3D9B35;--gd:#22701F;--gl:#8CC63F;--bg:#F4F9F2;--ink:#1F1F1F;--grey:#5E6B5C;\n  font-family:inherit;color:var(--ink);line-height:1.65;max-width:100%;}\n.zbj *{box-sizing:border-box}\n.zbj h2{font-size:1.65rem;line-height:1.25;color:var(--gd);margin:2.2rem 0 .8rem;font-weight:700}\n.zbj h3{font-size:1.18rem;color:var(--gd);margin:1.6rem 0 .6rem;font-weight:700}\n.zbj p{margin:0 0 1rem}\n.zbj .lead{font-size:1.12rem;color:var(--grey);margin-bottom:1.6rem}<\/p>\n<p>\/* ---------- animated hero ---------- *\/\n.zbj .hero{position:relative;overflow:hidden;border-radius:10px;isolation:isolate;\n  background:radial-gradient(120% 90% at 78% 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.lab{font-size:.88rem;color:var(--grey);margin-top:.25rem}\n.zbj .split{display:grid;grid-template-columns:1fr 1fr;gap:1.6rem;margin:1.2rem 0}\n@media(max-width:780px){.zbj .split{grid-template-columns:1fr}}\n.zbj ul.check{list-style:none;padding:0;margin:.6rem 0 1.2rem}\n.zbj ul.check li{position:relative;padding:.38rem 0 .38rem 1.75rem;border-bottom:1px solid #EDF2EB}\n.zbj ul.check li:last-child{border-bottom:none}\n.zbj ul.check li:before{content:\"\u2713\";position:absolute;left:0;top:.38rem;color:var(--g);font-weight:800}\n.zbj table{width:100%;border-collapse:collapse;margin:1rem 0 .6rem;font-size:.95rem}\n.zbj table th{background:var(--gd);color:#fff;text-align:left;padding:.62rem .8rem;font-weight:600}\n.zbj table td{padding:.55rem .8rem;border-bottom:1px solid #E6EDE4}\n.zbj table tr:nth-child(even) td{background:#FAFCF9}\n.zbj table td.num,.zbj table th.num{text-align:right;white-space:nowrap}\n.zbj .fig{margin:1.4rem 0}\n.zbj .fig img{width:100%;height:auto;border-radius:8px;border:1px solid #E2EAE0;display:block}\n.zbj .fig figcaption{font-size:.82rem;color:var(--grey);margin-top:.55rem;line-height:1.5}\n.zbj .cta{background:var(--gd);color:#fff;border-radius:8px;padding:1.5rem 1.6rem;margin:2rem 0 0;\n  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:1rem}\n.zbj .cta p{margin:0;font-size:1.05rem}\n.zbj .cta a{background:var(--gl);color:#14290F;text-decoration:none;font-weight:700;\n  padding:.7rem 1.5rem;border-radius:26px;white-space:nowrap;display:inline-block}\n.zbj .cta a:hover{background:#fff;color:var(--gd)}\n.zbj .small{font-size:.82rem;color:var(--grey)}\n.zbj .foot{font-size:.78rem;color:var(--grey);margin-top:.4rem;line-height:1.5}\n<\/style>\n<div class=\"zbj\">\n<p>  <!-- ============ HERO with drifting ink ============ --><\/p>\n<div class=\"hero\">\n<div class=\"hero-copy\">\n<h1>ZENITH BLACKJAK<sup>\u00ae<\/sup><\/h1>\n<p class=\"sub\">Liquid humic biostimulant \u2014 a concentrated suspension of pure, chemically unmodified humus from natural leonardite<\/p>\n<div class=\"pills\">\n        <span class=\"pill\">Acidic pH 4 \u2013 5<\/span><br \/>\n        <span class=\"pill\">Humic \u00b7 Fulvic \u00b7 Ulmic \u00b7 Humin<\/span><br \/>\n        <span class=\"pill\">Foliar &amp; fertigation<\/span><br \/>\n        <span class=\"pill\">Suspension Concentrate (SC)<\/span><br \/>\n        <span class=\"pill alt\">Suitable for organic farming<\/span>\n      <\/div>\n<\/p><\/div>\n<div class=\"shot\">\n      <img decoding=\"async\" class=\"bottle\" src=\"https:\/\/zenith-tech.de\/wp-content\/uploads\/2026\/09\/Untitled-2-scaled.png\" alt=\"ZENITH BLACKJAK 1 L liquid humic biostimulant bottle with humic suspension dispersing in water\">\n    <\/div>\n<\/p><\/div>\n<p class=\"lead\">Most humic products on the market are <strong>humates<\/strong> \u2014 alkaline salts, pH above 9, containing only the<br \/>\n  humic and fulvic fractions. ZENITH BLACKJAK is different on both counts: it delivers the <strong>complete humic<br \/>\n  spectrum<\/strong> at an <strong>acidic pH of 4 \u2013 5<\/strong>, so the active molecules reach the plant in their<br \/>\n  original free-acid form rather than as salts.<\/p>\n<p>  <!-- ============ WHY DIFFERENT ============ --><\/p>\n<h2>Why the full humic spectrum matters<\/h2>\n<p>Natural humus contains four main groups of substances, each with a different solubility \u2014 which is exactly why<br \/>\n  most manufacturers extract only part of it:<\/p>\n<table>\n<tr>\n<th>Fraction<\/th>\n<th>Solubility<\/th>\n<th>Role in the plant\u2013soil system<\/th>\n<\/tr>\n<tr>\n<td><strong>Humic acids<\/strong><\/td>\n<td>Soluble in alkali only<\/td>\n<td>Soil activator \u2014 improves structure, buffering and cation exchange<\/td>\n<\/tr>\n<tr>\n<td><strong>Fulvic acids<\/strong><\/td>\n<td>Soluble in alkaline and acidic solutions<\/td>\n<td>Nutrient carrier \u2014 mobilises and transports nutrients<\/td>\n<\/tr>\n<tr>\n<td><strong>Ulmic acids<\/strong><\/td>\n<td>Soluble in alcoholic solution of humic acids<\/td>\n<td>Natural chelating agent \u2014 ionises metals, stimulates root development<\/td>\n<\/tr>\n<tr>\n<td><strong>Humin<\/strong><\/td>\n<td>Insoluble in alkali and acid<\/td>\n<td>Direct plant activator \u2014 absorbed and transported by the vascular system<\/td>\n<\/tr>\n<\/table>\n<p>Because full extraction is technically demanding, most preparations available are humates: salts of only the<br \/>\n  humic and fulvic fractions, obtained by extraction with potassium or sodium alkali, with an alkaline pH above 9.<\/p>\n<p><strong>ZENITH BLACKJAK was developed to deliver something more complete<\/strong> \u2014 an acidic concentrated<br \/>\n  suspension (pH 4 \u2013 5) containing not only humic and fulvic acids but also <strong>ulmic acids and humin<\/strong>,<br \/>\n  together with the other beneficial nutrients naturally present in leonardite.<\/p>\n<div class=\"split\">\n<div>\n<h3>Indirect action \u2014 the soil<\/h3>\n<p>Humic and fulvic acids work as soil activators, stimulating the metabolism of soil microorganisms and the<br \/>\n      dynamics of nutrient cycling. This is what conventional humates deliver.<\/p>\n<\/p><\/div>\n<div>\n<h3>Direct action \u2014 the plant<\/h3>\n<p>Ulmic acids and humin act as plant growth activators at the level of metabolism and of hormonal and<br \/>\n      enzymatic processes. Certain components of humin are absorbed and transported directly by the vascular system<br \/>\n      and catalyse numerous metabolic processes.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<h2>Why the acidic pH is the real advantage<\/h2>\n<p>An alkaline humate has to be neutralised by the soil or the leaf surface before it can do much. ZENITH BLACKJAK<br \/>\n  arrives already acidic, and that changes four things:<\/p>\n<ul class=\"check\">\n<li><strong>Micronutrients stay available.<\/strong> Iron, manganese, zinc and copper are far more soluble at low pH.<br \/>\n    In the calcareous, high-pH soils common across the Mediterranean, the Middle East and North Africa, these elements<br \/>\n    are chemically locked up \u2014 an acidic humic input helps release them in the root zone.<\/li>\n<li><strong>Phosphorus is freed.<\/strong> In alkaline soils phosphate is bound as insoluble calcium phosphate.<br \/>\n    Local acidification around the root, combined with the chelating action of the humic and ulmic fractions, helps<br \/>\n    bring it back into solution.<\/li>\n<li><strong>Better foliar uptake, gentler on the leaf.<\/strong> Slightly acidic spray solutions favour penetration<br \/>\n    through the leaf cuticle, and they do not carry the leaf-scorch and tank-mix instability risk that comes with<br \/>\n    strongly alkaline products.<\/li>\n<li><strong>Cleaner irrigation lines and safer tank mixes.<\/strong> An acidic product does not precipitate with<br \/>\n    micronutrients or phosphates in the mixing tank, and helps keep drip emitters free of lime scale, rather than<br \/>\n    contributing to the blockages that alkaline products can cause.<\/li>\n<\/ul>\n<p>The humic substances themselves then raise the <strong>cation exchange capacity<\/strong> of the soil once<br \/>\n  incorporated \u2014 holding potassium, calcium, magnesium and ammonium against leaching and releasing them to the crop as<br \/>\n  it needs them. This is the long-term soil benefit that sits on top of the immediate uptake effect.<\/p>\n<p>Delivering the humic and fulvic acids in their <strong>original free-acid form rather than as potassium or sodium<br \/>\n  salts<\/strong> is what makes ZENITH BLACKJAK markedly more active than a humate in foliar application \u2014 and equally<br \/>\n  effective through drip irrigation.<\/p>\n<p>The suspension is stable and free-flowing, passing through spray nozzles and drip emitters without clogging,<br \/>\n  in both <strong>foliar application<\/strong> and <strong>drip irrigation<\/strong>.<\/p>\n<p>  <!-- ============ RESEARCH ============ --><\/p>\n<h2>What the research shows<\/h2>\n<p>Humic substances are among the most thoroughly studied inputs in plant nutrition. The figures below come from<br \/>\n  independent, peer-reviewed research on humic and fulvic acid applications \u2014 including a meta-analysis that pooled<br \/>\n  more than four hundred published trials.<\/p>\n<div class=\"grid4\">\n<div class=\"card\">\n<div class=\"num\">+22 %<\/div>\n<div class=\"lab\">Shoot dry weight<br \/><span class=\"small\">meta-analysis, \u00b14 %<\/span><\/div>\n<\/div>\n<div class=\"card\">\n<div class=\"num\">+21 %<\/div>\n<div class=\"lab\">Root dry weight<br \/><span class=\"small\">meta-analysis, \u00b16 %<\/span><\/div>\n<\/div>\n<div class=\"card\">\n<div class=\"num\">+28 %<\/div>\n<div class=\"lab\">Chlorophyll index<br \/><span class=\"small\">tomato, foliar application<\/span><\/div>\n<\/div>\n<div class=\"card\">\n<div class=\"num\">+30 %<\/div>\n<div class=\"lab\">Storage root yield<br \/><span class=\"small\">sweet potato<\/span><\/div>\n<\/div><\/div>\n<figure class=\"fig\">\n    <img decoding=\"async\" src=\"https:\/\/zenith-tech.de\/wp-content\/uploads\/2026\/09\/zenith-blackjack-research-results.png\" alt=\"Published research results for humic substances: shoot dry weight +22%, root dry weight +21%, root length and root dry weight +25%, chlorophyll index +28.2%, sweet potato storage root yield +29.6%, sugarcane stem yield +37%\"><figcaption><strong>Published research on humic substances.<\/strong> Sources: Rose et al. (2014), meta-analysis in<br \/>\n    <em>Advances in Agronomy<\/em> \u2014 shoot dry weight +22 \u00b1 4 %, root dry weight +21 \u00b1 6 %; humic-like substances applied<br \/>\n    foliarly to tomato (2025); humic-acid urea on sweet potato (2017); humic acid biostimulant applied foliarly to<br \/>\n    sugarcane. These results come from independent published research on humic substances in general and are not trials<br \/>\n    of this product. Field response varies with soil type, crop, climate and application method.<\/figcaption><\/figure>\n<p>The mechanism behind these numbers is consistent across studies: humic substances stimulate plasma membrane<br \/>\n  H\u207a-ATPase activity, and the lower molecular weight fractions penetrate plant cells to act as signalling molecules.<br \/>\n  The result is a coordinated increase in both root and shoot growth rather than one at the expense of the other.<\/p>\n<p>  <!-- ============ BENEFITS ============ --><\/p>\n<h2>Much more than a humate<\/h2>\n<div class=\"split\">\n<div>\n<ul class=\"check\">\n<li>Improves plant development and vigour<\/li>\n<li>Stimulates development of the root system<\/li>\n<li>Increases resistance to abiotic stress<\/li>\n<li>Acidic pH 4 \u2013 5 \u2014 roots absorb better and faster<\/li>\n<li>Greater absorption and use of nutrients<\/li>\n<li>Improves soil structure and microbial activity<\/li>\n<li>Activates cation exchange of macro- and micronutrients<\/li>\n<\/ul><\/div>\n<div>\n<ul class=\"check\">\n<li>Natural leonardite origin, with naturally occurring nutrients<\/li>\n<li>Ulmic acid and humin activate root and vegetative growth<\/li>\n<li>Acts as a natural chelating agent throughout the plant<\/li>\n<li>Enhances uptake of nutrients penetrating the leaves<\/li>\n<li>Does not clog spray nozzles or drip emitters \u2014 superior solubility<\/li>\n<li>Suitable for seed treatment, drip irrigation and foliar use<\/li>\n<\/ul><\/div>\n<\/p><\/div>\n<p>  <!-- ============ COMPOSITION ============ --><\/p>\n<h2>Composition<\/h2>\n<div class=\"split\" style=\"gap:1.2rem\">\n<div>\n<table>\n<tr>\n<th>Content<\/th>\n<th class=\"num\">% w\/w<\/th>\n<\/tr>\n<tr>\n<td>Total Humic Extracts <sup>1<\/sup><\/td>\n<td class=\"num\">22 \u2013 26<\/td>\n<\/tr>\n<tr>\n<td>Humic Acid <sup>1<\/sup><\/td>\n<td class=\"num\">19 \u2013 21<\/td>\n<\/tr>\n<tr>\n<td>Fulvic Acid <sup>1<\/sup><\/td>\n<td class=\"num\">3 \u2013 5<\/td>\n<\/tr>\n<tr>\n<td>Potassium Oxide (K<sub>2<\/sub>O)<\/td>\n<td class=\"num\">4<\/td>\n<\/tr>\n<\/table><\/div>\n<div>\n<table>\n<tr>\n<th>Property<\/th>\n<th class=\"num\">Value<\/th>\n<\/tr>\n<tr>\n<td>Organic Matter<\/td>\n<td class=\"num\">23 %<\/td>\n<\/tr>\n<tr>\n<td>Organic Carbon<\/td>\n<td class=\"num\">7.3 %<\/td>\n<\/tr>\n<tr>\n<td><strong>pH<\/strong><\/td>\n<td class=\"num\"><strong>4 \u2013 5<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Density (20 \u00b0C)<\/td>\n<td class=\"num\">approx. 1.135 g\/cm<sup>3<\/sup><\/td>\n<\/tr>\n<\/table><\/div>\n<\/p><\/div>\n<p class=\"foot\"><sup>1<\/sup> Humic and fulvic fractions determined according to <strong>ISO 19822<\/strong><br \/>\n  (International Humic Substances Society reference method). ISO 19822 is the internationally recognised standard for<br \/>\n  the quantification of humic and fulvic acids in fertilizer materials, and is the figure on which this product is<br \/>\n  guaranteed.<\/p>\n<p>  <!-- ============ APPLICATION ============ --><\/p>\n<h2>How to use<\/h2>\n<table>\n<tr>\n<th>Application method<\/th>\n<th>Guidance<\/th>\n<th>Rate<\/th>\n<\/tr>\n<tr>\n<td><strong>Drip irrigation \/ fertigation<\/strong><\/td>\n<td>Apply through the season at regular intervals. Shake well before use.<\/td>\n<td>5 \u2013 15 L\/ha per season<\/td>\n<\/tr>\n<tr>\n<td><strong>Foliar application<\/strong><\/td>\n<td>Apply to an actively growing crop; avoid the hottest hours of the day.<\/td>\n<td>1.5 \u2013 3 L\/ha per application<\/td>\n<\/tr>\n<tr>\n<td><strong>Seed treatment<\/strong><\/td>\n<td>Dilute before use and treat evenly.<\/td>\n<td>0.5 \u2013 2 L per tonne of seed<\/td>\n<\/tr>\n<tr>\n<td><strong>Soil application at planting<\/strong><\/td>\n<td>Apply to the root zone.<\/td>\n<td>10 \u2013 20 L\/ha<\/td>\n<\/tr>\n<\/table>\n<p class=\"small\">Rates are guidance only. Adjust to crop, growth stage, soil analysis, water quality and local<br \/>\n  agronomic practice. Always carry out a small-scale trial before large-scale use.<\/p>\n<h3>Compatibility<\/h3>\n<p>Compatible with most macro- and micronutrients and with plant protection products. Because ZENITH BLACKJAK is<br \/>\n  acidic (pH 4 \u2013 5) it is more tank-mix tolerant than alkaline humates \u2014 it will not precipitate micronutrients or<br \/>\n  phosphates in the mixing tank. A jar test must still be carried out before any new mixture, and the product should<br \/>\n  not be combined directly with strongly alkaline products.<\/p>\n<h3>Packaging and storage<\/h3>\n<p>Available in 1 L (1.135 kg), 5 L and 20 L containers and 1000 L IBC. Store in the original closed container in a<br \/>\n  cool, dry, well-ventilated place between 5 \u00b0C and 30 \u00b0C, protected from direct sunlight and frost. Shake well before<br \/>\n  use; natural sedimentation does not affect product quality. Shelf life 24 months from date of manufacture.<\/p>\n<p>  <!-- ============ CTA ============ --><\/p>\n<div class=\"cta\">\n<p><strong>Need technical advice or a quotation?<\/strong><br \/>\n    Our agronomy team will help you build the right programme for your crop.<\/p>\n<p>    <a href=\"https:\/\/zenith-tech.de\/contact-us\/\">Contact ZENITH<\/a>\n  <\/div>\n<\/div>\n<p><!-- ============ END ZENITH BLACKJAK ============ --><br \/>\n[\/et_pb_text][\/et_pb_column]<br \/>\n\t\t\t[\/et_pb_row]<br \/>\n\t\t[\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>ZENITH BLACKJAK\u00ae Liquid humic biostimulant \u2014 a concentrated suspension of pure, chemically unmodified humus from natural leonardite Acidic pH 4 \u2013 5 Humic \u00b7 Fulvic \u00b7 Ulmic \u00b7 Humin Foliar &amp; fertigation Suspension Concentrate (SC) Suitable for organic farming Most humic products on the market are humates \u2014 alkaline salts, pH above 9, containing only [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1052,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"<!-- ============================================================\r\n     ZENITH BLACKJAK \u2014 product page content  (v2, 16.09.2026)\r\n     Paste into WordPress: Add Block > Custom HTML  (or Elementor > HTML widget)\r\n\r\n     UPLOAD THESE 3 IMAGES TO THE MEDIA LIBRARY FIRST, THEN REPLACE THE\r\n     THREE PLACEHOLDERS BELOW WITH THEIR URLs:\r\n        IMG_BOTTLE   ->  zenith-blackjak-bottle.png\r\n        IMG_INK      ->  zenith-blackjak-ink.png\r\n        https:\/\/zenith-tech.de\/wp-content\/uploads\/2026\/09\/zenith-blackjack-research-results.png  ->  zenith-blackjack-research-results.png\r\n     ============================================================ -->\r\n\r\n<style>\r\n.zbj{--g:#3D9B35;--gd:#22701F;--gl:#8CC63F;--bg:#F4F9F2;--ink:#1F1F1F;--grey:#5E6B5C;\r\n  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p{margin:0;font-size:1.05rem}\r\n.zbj .cta a{background:var(--gl);color:#14290F;text-decoration:none;font-weight:700;\r\n  padding:.7rem 1.5rem;border-radius:26px;white-space:nowrap;display:inline-block}\r\n.zbj .cta a:hover{background:#fff;color:var(--gd)}\r\n.zbj .small{font-size:.82rem;color:var(--grey)}\r\n.zbj .foot{font-size:.78rem;color:var(--grey);margin-top:.4rem;line-height:1.5}\r\n<\/style>\r\n\r\n<div class=\"zbj\">\r\n\r\n  <!-- ============ HERO with drifting ink ============ -->\r\n  <div class=\"hero\">\r\n    <div class=\"hero-copy\">\r\n      <h1>ZENITH BLACKJAK<sup>\u00ae<\/sup><\/h1>\r\n      <p class=\"sub\">Liquid humic biostimulant \u2014 a concentrated suspension of pure, chemically unmodified humus from natural leonardite<\/p>\r\n      <div class=\"pills\">\r\n        <span class=\"pill\">Acidic pH 4 \u2013 5<\/span>\r\n        <span class=\"pill\">Humic \u00b7 Fulvic \u00b7 Ulmic \u00b7 Humin<\/span>\r\n        <span class=\"pill\">Foliar &amp; fertigation<\/span>\r\n        <span class=\"pill\">Suspension Concentrate (SC)<\/span>\r\n        <span class=\"pill alt\">Suitable for organic farming<\/span>\r\n      <\/div>\r\n    <\/div>\r\n    <div class=\"shot\">\r\n      <img class=\"bottle\" src=\"https:\/\/zenith-tech.de\/wp-content\/uploads\/2026\/09\/Untitled-2-scaled.png\" alt=\"ZENITH BLACKJAK 1 L liquid humic biostimulant bottle with humic suspension dispersing in water\">\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <p class=\"lead\">Most humic products on the market are <strong>humates<\/strong> \u2014 alkaline salts, pH above 9, containing only the\r\n  humic and fulvic fractions. ZENITH BLACKJAK is different on both counts: it delivers the <strong>complete humic\r\n  spectrum<\/strong> at an <strong>acidic pH of 4 \u2013 5<\/strong>, so the active molecules reach the plant in their\r\n  original free-acid form rather than as salts.<\/p>\r\n\r\n  <!-- ============ WHY DIFFERENT ============ -->\r\n  <h2>Why the full humic spectrum matters<\/h2>\r\n\r\n  <p>Natural humus contains four main groups of substances, each with a different solubility \u2014 which is exactly why\r\n  most manufacturers extract only part of it:<\/p>\r\n\r\n  <table>\r\n    <tr><th>Fraction<\/th><th>Solubility<\/th><th>Role in the plant\u2013soil system<\/th><\/tr>\r\n    <tr><td><strong>Humic acids<\/strong><\/td><td>Soluble in alkali only<\/td><td>Soil activator \u2014 improves structure, buffering and cation exchange<\/td><\/tr>\r\n    <tr><td><strong>Fulvic acids<\/strong><\/td><td>Soluble in alkaline and acidic solutions<\/td><td>Nutrient carrier \u2014 mobilises and transports nutrients<\/td><\/tr>\r\n    <tr><td><strong>Ulmic acids<\/strong><\/td><td>Soluble in alcoholic solution of humic acids<\/td><td>Natural chelating agent \u2014 ionises metals, stimulates root development<\/td><\/tr>\r\n    <tr><td><strong>Humin<\/strong><\/td><td>Insoluble in alkali and acid<\/td><td>Direct plant activator \u2014 absorbed and transported by the vascular system<\/td><\/tr>\r\n  <\/table>\r\n\r\n  <p>Because full extraction is technically demanding, most preparations available are humates: salts of only the\r\n  humic and fulvic fractions, obtained by extraction with potassium or sodium alkali, with an alkaline pH above 9.<\/p>\r\n\r\n  <p><strong>ZENITH BLACKJAK was developed to deliver something more complete<\/strong> \u2014 an acidic concentrated\r\n  suspension (pH 4 \u2013 5) containing not only humic and fulvic acids but also <strong>ulmic acids and humin<\/strong>,\r\n  together with the other beneficial nutrients naturally present in leonardite.<\/p>\r\n\r\n  <div class=\"split\">\r\n    <div>\r\n      <h3>Indirect action \u2014 the soil<\/h3>\r\n      <p>Humic and fulvic acids work as soil activators, stimulating the metabolism of soil microorganisms and the\r\n      dynamics of nutrient cycling. This is what conventional humates deliver.<\/p>\r\n    <\/div>\r\n    <div>\r\n      <h3>Direct action \u2014 the plant<\/h3>\r\n      <p>Ulmic acids and humin act as plant growth activators at the level of metabolism and of hormonal and\r\n      enzymatic processes. Certain components of humin are absorbed and transported directly by the vascular system\r\n      and catalyse numerous metabolic processes.<\/p>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <h2>Why the acidic pH is the real advantage<\/h2>\r\n\r\n  <p>An alkaline humate has to be neutralised by the soil or the leaf surface before it can do much. ZENITH BLACKJAK\r\n  arrives already acidic, and that changes four things:<\/p>\r\n\r\n  <ul class=\"check\">\r\n    <li><strong>Micronutrients stay available.<\/strong> Iron, manganese, zinc and copper are far more soluble at low pH.\r\n    In the calcareous, high-pH soils common across the Mediterranean, the Middle East and North Africa, these elements\r\n    are chemically locked up \u2014 an acidic humic input helps release them in the root zone.<\/li>\r\n    <li><strong>Phosphorus is freed.<\/strong> In alkaline soils phosphate is bound as insoluble calcium phosphate.\r\n    Local acidification around the root, combined with the chelating action of the humic and ulmic fractions, helps\r\n    bring it back into solution.<\/li>\r\n    <li><strong>Better foliar uptake, gentler on the leaf.<\/strong> Slightly acidic spray solutions favour penetration\r\n    through the leaf cuticle, and they do not carry the leaf-scorch and tank-mix instability risk that comes with\r\n    strongly alkaline products.<\/li>\r\n    <li><strong>Cleaner irrigation lines and safer tank mixes.<\/strong> An acidic product does not precipitate with\r\n    micronutrients or phosphates in the mixing tank, and helps keep drip emitters free of lime scale, rather than\r\n    contributing to the blockages that alkaline products can cause.<\/li>\r\n  <\/ul>\r\n\r\n  <p>The humic substances themselves then raise the <strong>cation exchange capacity<\/strong> of the soil once\r\n  incorporated \u2014 holding potassium, calcium, magnesium and ammonium against leaching and releasing them to the crop as\r\n  it needs them. This is the long-term soil benefit that sits on top of the immediate uptake effect.<\/p>\r\n\r\n  <p>Delivering the humic and fulvic acids in their <strong>original free-acid form rather than as potassium or sodium\r\n  salts<\/strong> is what makes ZENITH BLACKJAK markedly more active than a humate in foliar application \u2014 and equally\r\n  effective through drip irrigation.<\/p>\r\n\r\n  <p>The suspension is stable and free-flowing, passing through spray nozzles and drip emitters without clogging,\r\n  in both <strong>foliar application<\/strong> and <strong>drip irrigation<\/strong>.<\/p>\r\n\r\n  <!-- ============ RESEARCH ============ -->\r\n  <h2>What the research shows<\/h2>\r\n\r\n  <p>Humic substances are among the most thoroughly studied inputs in plant nutrition. The figures below come from\r\n  independent, peer-reviewed research on humic and fulvic acid applications \u2014 including a meta-analysis that pooled\r\n  more than four hundred published trials.<\/p>\r\n\r\n  <div class=\"grid4\">\r\n    <div class=\"card\"><div class=\"num\">+22 %<\/div><div class=\"lab\">Shoot dry weight<br><span class=\"small\">meta-analysis, \u00b14 %<\/span><\/div><\/div>\r\n    <div class=\"card\"><div class=\"num\">+21 %<\/div><div class=\"lab\">Root dry weight<br><span class=\"small\">meta-analysis, \u00b16 %<\/span><\/div><\/div>\r\n    <div class=\"card\"><div class=\"num\">+28 %<\/div><div class=\"lab\">Chlorophyll index<br><span class=\"small\">tomato, foliar application<\/span><\/div><\/div>\r\n    <div class=\"card\"><div class=\"num\">+30 %<\/div><div class=\"lab\">Storage root yield<br><span class=\"small\">sweet potato<\/span><\/div><\/div>\r\n  <\/div>\r\n\r\n  <figure class=\"fig\">\r\n    <img src=\"https:\/\/zenith-tech.de\/wp-content\/uploads\/2026\/09\/zenith-blackjack-research-results.png\" alt=\"Published research results for humic substances: shoot dry weight +22%, root dry weight +21%, root length and root dry weight +25%, chlorophyll index +28.2%, sweet potato storage root yield +29.6%, sugarcane stem yield +37%\">\r\n    <figcaption><strong>Published research on humic substances.<\/strong> Sources: Rose et al. (2014), meta-analysis in\r\n    <em>Advances in Agronomy<\/em> \u2014 shoot dry weight +22 \u00b1 4 %, root dry weight +21 \u00b1 6 %; humic-like substances applied\r\n    foliarly to tomato (2025); humic-acid urea on sweet potato (2017); humic acid biostimulant applied foliarly to\r\n    sugarcane. These results come from independent published research on humic substances in general and are not trials\r\n    of this product. Field response varies with soil type, crop, climate and application method.<\/figcaption>\r\n  <\/figure>\r\n\r\n  <p>The mechanism behind these numbers is consistent across studies: humic substances stimulate plasma membrane\r\n  H\u207a-ATPase activity, and the lower molecular weight fractions penetrate plant cells to act as signalling molecules.\r\n  The result is a coordinated increase in both root and shoot growth rather than one at the expense of the other.<\/p>\r\n\r\n  <!-- ============ BENEFITS ============ -->\r\n  <h2>Much more than a humate<\/h2>\r\n\r\n  <div class=\"split\">\r\n    <div>\r\n      <ul class=\"check\">\r\n        <li>Improves plant development and vigour<\/li>\r\n        <li>Stimulates development of the root system<\/li>\r\n        <li>Increases resistance to abiotic stress<\/li>\r\n        <li>Acidic pH 4 \u2013 5 \u2014 roots absorb better and faster<\/li>\r\n        <li>Greater absorption and use of nutrients<\/li>\r\n        <li>Improves soil structure and microbial activity<\/li>\r\n        <li>Activates cation exchange of macro- and micronutrients<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n    <div>\r\n      <ul class=\"check\">\r\n        <li>Natural leonardite origin, with naturally occurring nutrients<\/li>\r\n        <li>Ulmic acid and humin activate root and vegetative growth<\/li>\r\n        <li>Acts as a natural chelating agent throughout the plant<\/li>\r\n        <li>Enhances uptake of nutrients penetrating the leaves<\/li>\r\n        <li>Does not clog spray nozzles or drip emitters \u2014 superior solubility<\/li>\r\n        <li>Suitable for seed treatment, drip irrigation and foliar use<\/li>\r\n      <\/ul>\r\n    <\/div>\r\n  <\/div>\r\n\r\n  <!-- ============ COMPOSITION ============ -->\r\n  <h2>Composition<\/h2>\r\n\r\n  <div class=\"split\" style=\"gap:1.2rem\">\r\n    <div>\r\n      <table>\r\n        <tr><th>Content<\/th><th class=\"num\">% w\/w<\/th><\/tr>\r\n        <tr><td>Total Humic Extracts <sup>1<\/sup><\/td><td class=\"num\">22 \u2013 26<\/td><\/tr>\r\n        <tr><td>Humic Acid <sup>1<\/sup><\/td><td class=\"num\">19 \u2013 21<\/td><\/tr>\r\n        <tr><td>Fulvic Acid <sup>1<\/sup><\/td><td class=\"num\">3 \u2013 5<\/td><\/tr>\r\n        <tr><td>Potassium Oxide (K<sub>2<\/sub>O)<\/td><td class=\"num\">4<\/td><\/tr>\r\n      <\/table>\r\n    <\/div>\r\n    <div>\r\n      <table>\r\n        <tr><th>Property<\/th><th class=\"num\">Value<\/th><\/tr>\r\n        <tr><td>Organic Matter<\/td><td class=\"num\">23 %<\/td><\/tr>\r\n        <tr><td>Organic Carbon<\/td><td class=\"num\">7.3 %<\/td><\/tr>\r\n        <tr><td><strong>pH<\/strong><\/td><td class=\"num\"><strong>4 \u2013 5<\/strong><\/td><\/tr>\r\n        <tr><td>Density (20 \u00b0C)<\/td><td class=\"num\">approx. 1.135 g\/cm<sup>3<\/sup><\/td><\/tr>\r\n      <\/table>\r\n    <\/div>\r\n  <\/div>\r\n  <p class=\"foot\"><sup>1<\/sup> Humic and fulvic fractions determined according to <strong>ISO 19822<\/strong>\r\n  (International Humic Substances Society reference method). ISO 19822 is the internationally recognised standard for\r\n  the quantification of humic and fulvic acids in fertilizer materials, and is the figure on which this product is\r\n  guaranteed.<\/p>\r\n\r\n  <!-- ============ APPLICATION ============ -->\r\n  <h2>How to use<\/h2>\r\n\r\n  <table>\r\n    <tr><th>Application method<\/th><th>Guidance<\/th><th>Rate<\/th><\/tr>\r\n    <tr><td><strong>Drip irrigation \/ fertigation<\/strong><\/td><td>Apply through the season at regular intervals. Shake well before use.<\/td><td>5 \u2013 15 L\/ha per season<\/td><\/tr>\r\n    <tr><td><strong>Foliar application<\/strong><\/td><td>Apply to an actively growing crop; avoid the hottest hours of the day.<\/td><td>1.5 \u2013 3 L\/ha per application<\/td><\/tr>\r\n    <tr><td><strong>Seed treatment<\/strong><\/td><td>Dilute before use and treat evenly.<\/td><td>0.5 \u2013 2 L per tonne of seed<\/td><\/tr>\r\n    <tr><td><strong>Soil application at planting<\/strong><\/td><td>Apply to the root zone.<\/td><td>10 \u2013 20 L\/ha<\/td><\/tr>\r\n  <\/table>\r\n\r\n  <p class=\"small\">Rates are guidance only. Adjust to crop, growth stage, soil analysis, water quality and local\r\n  agronomic practice. Always carry out a small-scale trial before large-scale use.<\/p>\r\n\r\n  <h3>Compatibility<\/h3>\r\n  <p>Compatible with most macro- and micronutrients and with plant protection products. Because ZENITH BLACKJAK is\r\n  acidic (pH 4 \u2013 5) it is more tank-mix tolerant than alkaline humates \u2014 it will not precipitate micronutrients or\r\n  phosphates in the mixing tank. A jar test must still be carried out before any new mixture, and the product should\r\n  not be combined directly with strongly alkaline products.<\/p>\r\n\r\n  <h3>Packaging and storage<\/h3>\r\n  <p>Available in 1 L (1.135 kg), 5 L and 20 L containers and 1000 L IBC. Store in the original closed container in a\r\n  cool, dry, well-ventilated place between 5 \u00b0C and 30 \u00b0C, protected from direct sunlight and frost. Shake well before\r\n  use; natural sedimentation does not affect product quality. Shelf life 24 months from date of manufacture.<\/p>\r\n\r\n  <!-- ============ CTA ============ -->\r\n  <div class=\"cta\">\r\n    <p><strong>Need technical advice or a quotation?<\/strong><br>\r\n    Our agronomy team will help you build the right programme for your crop.<\/p>\r\n    <a href=\"https:\/\/zenith-tech.de\/contact-us\/\">Contact ZENITH<\/a>\r\n  <\/div>\r\n\r\n<\/div>\r\n<!-- ============ END ZENITH BLACKJAK ============ -->\r\n","_et_gb_content_width":"","footnotes":""},"project_category":[8],"project_tag":[],"class_list":["post-1051","project","type-project","status-publish","has-post-thumbnail","hentry","project_category-special-products"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ZENITH LIQUID HUMIC ACID- BLACKJACK - Zenith Tech<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zenith-tech.de\/en\/project\/zenith-liquid-humic-acid-blackjack\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ZENITH LIQUID HUMIC ACID- BLACKJACK - Zenith Tech\" \/>\n<meta property=\"og:description\" content=\"ZENITH BLACKJAK\u00ae Liquid humic biostimulant \u2014 a concentrated suspension of pure, chemically unmodified humus from natural leonardite Acidic pH 4 \u2013 5 Humic \u00b7 Fulvic \u00b7 Ulmic \u00b7 Humin Foliar &amp; fertigation Suspension Concentrate (SC) Suitable for organic farming Most humic products on the market are humates \u2014 alkaline salts, pH above 9, containing only [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/zenith-tech.de\/en\/project\/zenith-liquid-humic-acid-blackjack\/\" \/>\n<meta property=\"og:site_name\" content=\"Zenith Tech\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-16T21:48:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/zenith-tech.de\/wp-content\/uploads\/2022\/03\/blackjack.png\" \/>\n\t<meta property=\"og:image:width\" content=\"721\" \/>\n\t<meta property=\"og:image:height\" content=\"721\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/\",\"url\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/\",\"name\":\"ZENITH LIQUID HUMIC ACID- BLACKJACK - Zenith Tech\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/zenith-tech.de\\\/wp-content\\\/uploads\\\/2022\\\/03\\\/blackjack.png\",\"datePublished\":\"2022-03-06T17:09:04+00:00\",\"dateModified\":\"2026-09-16T21:48:02+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/#primaryimage\",\"url\":\"https:\\\/\\\/zenith-tech.de\\\/wp-content\\\/uploads\\\/2022\\\/03\\\/blackjack.png\",\"contentUrl\":\"https:\\\/\\\/zenith-tech.de\\\/wp-content\\\/uploads\\\/2022\\\/03\\\/blackjack.png\",\"width\":721,\"height\":721},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/zenith-liquid-humic-acid-blackjack\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/zenith-tech.de\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Projekte\",\"item\":\"https:\\\/\\\/zenith-tech.de\\\/project\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"ZENITH LIQUID HUMIC ACID- BLACKJACK\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/#website\",\"url\":\"https:\\\/\\\/zenith-tech.de\\\/\",\"name\":\"Zenith Tech\",\"description\":\"Company Website\",\"publisher\":{\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/zenith-tech.de\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/#organization\",\"name\":\"ZENITH Growth Tech GmbH\",\"url\":\"https:\\\/\\\/zenith-tech.de\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/zenith-tech.de\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/zenith-logo-heartbeat.png\",\"contentUrl\":\"https:\\\/\\\/zenith-tech.de\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/zenith-logo-heartbeat.png\",\"width\":2048,\"height\":1534,\"caption\":\"ZENITH Growth Tech GmbH\"},\"image\":{\"@id\":\"https:\\\/\\\/zenith-tech.de\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"ZENITH LIQUID HUMIC ACID- BLACKJACK - Zenith Tech","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/zenith-tech.de\/en\/project\/zenith-liquid-humic-acid-blackjack\/","og_locale":"en_US","og_type":"article","og_title":"ZENITH LIQUID HUMIC ACID- BLACKJACK - Zenith Tech","og_description":"ZENITH BLACKJAK\u00ae Liquid humic biostimulant \u2014 a concentrated suspension of pure, chemically unmodified humus from natural leonardite Acidic pH 4 \u2013 5 Humic \u00b7 Fulvic \u00b7 Ulmic \u00b7 Humin Foliar &amp; 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