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Nutrient Solutions |
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FERTILISERS FOR NUTRIENT SOLUTIONS | ||
Most of the chemicals required for making nutrient solutions are also used by the fertiliser industry. Readily available fertiliser grade chemicals may be hard to dissolve, or may contain impurities which have either a nuisance value or may be harmful in nutrient solutions. Better grade products suitable for hydroponic use are sold as greenhouse grade or technical grade products. Major components of hydroponic solutions are generally available as listed below. Calcium nitrate, greenhouse grade Calcium chloride, technical grade Potassium nitrate, greenhouse grade Iron Chelate - many types of iron chelate are available at a wide range of prices. FeEDTA (Iron- ethylene diamine tetra acetic acid or sodium salt) is suitable (provided that it is a high quality product) and should contain 13% Fe. Some unbranded sources of FeEDTA are difficult to use. Mono-ammonium phosphate - technical grade Mono-potassium phosphate- technical grade Phosphoric acid, 65% food grade Nitric acid (70%) technical grade Ammonium nitrate Fertiliser grade Potassium sulphate greenhouse grade or water soluble grade (fertiliser grade is very hard to dissolve) Potassium chloride - greenhouse or technical grade Magnesium sulphate (Epsom Salts) - most grades are suitable Magnesium nitrate - technical grade Manganese sulphate - technical grade Manganese sulphate tetrahydrate Zinc sulphate - technical grade Zinc Sulphate heptahydrate = Copper sulphate - technical grade Copper Sulphate pentahydrate Borax - technical grade sodium tetraborate decahydrate Boric acid - technical grade Solubor and similar 20% boron products - technical grades Sodium molybdate -technical grade Ammonium molybdate - technical grade http://www.haifachem.com/water-solublefertiliszers.products http://www.yara.com.au/ http://www.kemira.growhow.com/ http://www.dissolvine.com/ Original 29/9/1999- revised 14/1/04/, 24/7/06 . ©:R A J White 5/7/07 |