{"id":23202,"date":"2019-04-10T11:52:47","date_gmt":"2019-04-10T04:52:47","guid":{"rendered":"http:\/\/tom.ji42.com\/?p=23202"},"modified":"2019-04-10T11:52:47","modified_gmt":"2019-04-10T04:52:47","slug":"hydroponic-nutrient-solutions","status":"publish","type":"post","link":"https:\/\/tom.tomwork.net\/?p=23202","title":{"rendered":"HYDROPONIC NUTRIENT SOLUTIONS"},"content":{"rendered":"<p>The hydroponic nutrient solution is the sole source of nutrients to the plant. Therefore, it is imperative to apply a balanced solution, that contains all plant nutrients, at the right balance.<\/p>\n<p>Several important factors have to be considered when choosing fertilizers and preparing a hydroponic nutrient solutions:<\/p>\n<ul>\n<li><\/li>\n<li><i class=\"fa fa-arrow-circle-o-right\"><\/i>\u00a0\u00a0<a href=\"http:\/\/www.smart-fertilizer.com\/articles\/irrigation-water-quality\">Water quality<\/a>\u00a0&#8211; salinity, concentration of potential harmful elements (like sodium, chlorides and boron)<\/li>\n<li><\/li>\n<li><i class=\"fa fa-arrow-circle-o-right\"><\/i>\u00a0 Required nutrients and their concentrations in the hydroponic nutrient solution<\/li>\n<li><\/li>\n<li><i class=\"fa fa-arrow-circle-o-right\"><\/i>\u00a0 Nutrient balance<\/li>\n<li><\/li>\n<li><i class=\"fa fa-arrow-circle-o-right\"><\/i>\u00a0\u00a0<a href=\"http:\/\/www.smart-fertilizer.com\/articles\/pH-alkalinity\">The pH\u00a0<\/a>of the hydroponic nutrient solution\u00a0and its\u00a0effect on uptake of nutrients by plants<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h2>STANDARD NUTRIENT SOLUTIONS<\/h2>\n<p>There are various standard nutrient solutions, such as the Hoagland solution (1933), Steiner (1961), Bollard (1966) and others. These standard solutions are good as a general guideline, but are\u00a0not adapted to specific growing conditions.<\/p>\n<p>Even if you decide to use one of the standard nutrient solution, make sure to use the nutrient concentration\u00a0as a guideline, and not the fertilizer recipe that corresponds to them. The initial composition of the raw water that you use will affect the actual nutrients that have to be added with fertilizers.<\/p>\n<h2>COMMON NUTRIENT RANGES IN HYDROPONIC NUTRIENT SOLUTIONS<\/h2>\n<div class=\"tg-wrap\">\n<table class=\"tg\">\n<tbody>\n<tr>\n<th class=\"tg-lc20\">Element<\/th>\n<th class=\"tg-lc20\">Ionic form absorbed by plants<\/th>\n<th class=\"tg-lc20\">Common range (ppm=mg\/l)<\/th>\n<\/tr>\n<tr>\n<td class=\"tg-7mhy\">Nitrogen<\/td>\n<td class=\"tg-7mhy\">Nitrate (NO3<sup>&#8211;<\/sup>),<br \/>\nAmmonium (NH4<sup>+<\/sup>)<\/td>\n<td class=\"tg-7mhy\">100-250 ppm elemental N<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-7mhy\">Phosphorus<\/td>\n<td class=\"tg-7mhy\">Dihydrogen phosphate (H2PO4<sup>&#8211;<\/sup>)<br \/>\nPhosphate (PO4<sup>3-<\/sup>)<br \/>\nMonohydrogen phosphate (HPO4<sup>2-<\/sup>)<\/td>\n<td class=\"tg-7mhy\">30-50 ppm elemental P<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Potassium<\/td>\n<td class=\"tg-yzt1\">Potassium (K<sup>+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">100-300 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Calcium<\/td>\n<td class=\"tg-yzt1\">Calcium (Ca<sup>2+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">80-140 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Magnesium<\/td>\n<td class=\"tg-yzt1\">Magnesium (Mg<sup>2+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">30-70 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Sulfur<\/td>\n<td class=\"tg-yzt1\">Sulfate (SO4<sup>2-<\/sup>)<\/td>\n<td class=\"tg-yzt1\">50-120 ppm elemental S<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Iron<\/td>\n<td class=\"tg-yzt1\">Ferrous ion (Fe<sup>2+<\/sup>)<br \/>\nFerric ion (Fe3<sup>+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">1-5 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Copper<\/td>\n<td class=\"tg-yzt1\">Copper (Cu<sup>2+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">0.04-0.2 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Manganese<\/td>\n<td class=\"tg-yzt1\">Manganese (Mn<sup>2+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">0.5-1.0 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Zinc<\/td>\n<td class=\"tg-yzt1\">Zinc (Zn<sup>2+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">0.3-0.6 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Molybdenum<\/td>\n<td class=\"tg-yzt1\">Molybdate (MoO4<sup>2-<\/sup>)<\/td>\n<td class=\"tg-yzt1\">0.04-0.08 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Boron<\/td>\n<td class=\"tg-yzt1\">Boric acid (H3BO3)<br \/>\nBorate (H2BO3<sup>&#8211;<\/sup>)<\/td>\n<td class=\"tg-yzt1\">0.2-0.5 ppm elemental B<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Chloride<\/td>\n<td class=\"tg-yzt1\">Chloride (Cl<sup>&#8211;<\/sup>)<\/td>\n<td class=\"tg-yzt1\">&lt;75 ppm<\/td>\n<\/tr>\n<tr>\n<td class=\"tg-yzt1\">Sodium<\/td>\n<td class=\"tg-yzt1\">Sodium (Na<sup>+<\/sup>)<\/td>\n<td class=\"tg-yzt1\">&lt;50 ppm TOXIC to plants<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><\/h2>\n<table border=\"0\">\n<tbody>\n<tr>\n<td>\n<p class=\"styleCustom7\"><strong>Suggested Nutrient Solutions for Various Crops<\/strong><\/p>\n<table class=\"styleCustom9\" border=\"1\" cellspacing=\"1\" cellpadding=\"5\" align=\"center\">\n<tbody>\n<tr id=\"header\" align=\"center\" valign=\"top\">\n<td>Crop<\/td>\n<td>N<\/td>\n<td>P<\/td>\n<td>K<\/td>\n<td>Ca<\/td>\n<td>Mg<\/td>\n<\/tr>\n<tr valign=\"top\">\n<td colspan=\"6\">Concentration in mg\/l (ppm)<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td><a href=\"http:\/\/www.smart-fertilizer.com\/articles\/tomato-fertilizer\"><strong>Tomato<\/strong><\/a><\/td>\n<td>190<\/td>\n<td>40<\/td>\n<td>310<\/td>\n<td>150<\/td>\n<td>45<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td><strong>Cucumber<\/strong><\/td>\n<td>200<\/td>\n<td>40<\/td>\n<td>280<\/td>\n<td>140<\/td>\n<td>40<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td><strong>Pepper<\/strong><\/td>\n<td>190<\/td>\n<td>45<\/td>\n<td>285<\/td>\n<td>130<\/td>\n<td>40<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td><strong>Strawberry<\/strong><\/td>\n<td>50<\/td>\n<td>25<\/td>\n<td>150<\/td>\n<td>65<\/td>\n<td>20<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td><strong>Melon<\/strong><\/td>\n<td>200<\/td>\n<td>45<\/td>\n<td>285<\/td>\n<td>115<\/td>\n<td>30<\/td>\n<\/tr>\n<tr align=\"center\" valign=\"top\">\n<td><strong>Roses<\/strong><\/td>\n<td>170<\/td>\n<td>45<\/td>\n<td>285<\/td>\n<td>120<\/td>\n<td>40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><\/h2>\n<h2>THE ELECTRICAL CONDUCTIVITY (EC) OF THE HYDROPONIC NUTRIENT SOLUTION<\/h2>\n<p>The electrical conductivity is a measure of the total salts dissolved in the hydroponic nutrient\u00a0solution. It is used for monitoring applications of fertilizers. Note that the EC reading doesn&#8217;t provide you with information regarding the exact mineral content of the nutrient solution.<\/p>\n<p>In closed\u00a0<a href=\"http:\/\/www.smart-fertilizer.com\/articles\/hydroponic-systems\">hydroponics systems<\/a>, the hydroponic nutrient solution is recirculated and elements which are not absorbed in high quantities\u00a0by plants (such as sodium, chloride, fluoride etc.) or ions released by the plant, build up in the hydroponic nutrient solution.<\/p>\n<p>In this case there is a need more information about the nutrient solution content, that EC cannot provide. Testing the hydroponic nutrient solution frequently will help you decide on the timing for replacing the nutrient solution or dilute it with fresh water.<\/p>\n<h2>pH OF THE HYDROPONIC NUTRIENT\u00a0SOLUTION<\/h2>\n<p>The optimal\u00a0<a href=\"http:\/\/www.smart-fertilizer.com\/articles\/pH-alkalinity\">pH\u00a0range<\/a>\u00a0of the\u00a0hydroponic nutrient solution is 5.8-6.3. Micronutrients are more available in lower pH, but when pH levels drop below 5.5, you run the risk of micronutrients toxicity, as well as impaired availability of calcium and magnesium.<\/p>\n<p>In hydroponics, especially in closed systems, the roots readily affect the hydroponic solution pH, so pH tends to fluctuate.<\/p>\n<p>Appropriate products for acidifying the hydroponic nutrient solution are sulfuric acid, phosphoric acid and nitric acid.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.smart-fertilizer.com\/Cms_Data\/Contents\/smart-eng\/Media\/Articlephotos\/nutrient-availability-ph.jpg\" alt=\"nutrient-availability-ph.jpg\" width=\"360\" height=\"322\" \/><\/p>\n<p>Ammonium\/nitrate is one of the major factors affecting the pH of the nutrient solution.<\/p>\n<h2>WATER QUALITY<\/h2>\n<p>The hydroponic nutrient solution consists of minerals in the raw water and nutrients added with fertilizers.<br \/>\nThe selection of fertilizers and their concentration in the hydroponic nutrient solution\u00a0greatly depend on the quality of the raw water. Therefore, testing the raw water prior to deciding on a fertilizer formula\u00a0is imperative.<\/p>\n<p>Minerals such as calcium, magnesium, sulfur\u00a0and trace elements such as boron, manganese, iron and zinc may be present in the source water. These elements must be factored in when adjusting the hydroponic nutrient solution.<\/p>\n<p>Additionally,\u00a0raw water might contain high concentrations of unwanted minerals, such as sodium, chloride or fluoride,\u00a0rendering it unsuitable for hydroponics.<\/p>\n<p>This can be solved by diluting the water\u00a0a pure water supply or\u00a0pre-treating the raw water with desalination or ion-exchange.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>The hydroponic nutrient solution is the sole source of nutrients to the plant. Therefore, it is imperative to apply a balanced solution, that contains all plant nutrients, at the right balance. Several important factors have to be considered when choosing fertilizers and preparing a hydroponic nutrient solutions: \u00a0\u00a0Water quality\u00a0&#8211; salinity, concentration of potential harmful elements [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[188],"tags":[],"class_list":["post-23202","post","type-post","status-publish","format-standard","hentry","category-188"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p6cOVM-62e","_links":{"self":[{"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=\/wp\/v2\/posts\/23202","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=23202"}],"version-history":[{"count":1,"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=\/wp\/v2\/posts\/23202\/revisions"}],"predecessor-version":[{"id":23203,"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=\/wp\/v2\/posts\/23202\/revisions\/23203"}],"wp:attachment":[{"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=23202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=23202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tom.tomwork.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=23202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}