CONCENTRATED PHOSPHORUS-POTASSIUM LIQUID FERTILIZER WITH MICROELEMENTS AND METHOD FOR ITS PRODUCTION

摘要

The concentrated phosphorus-potassium liquid fertilizer with microelements is used for leaf and root feeding of the plants by means of spraying, fertigation or hydroponics. During the preparation of the process solution (the dissolving in water), it can be used in combination with nitrogen fertilizers. It can also serve as a base solution for production of complex NPK liquid fertilizers by addingnitrogen-containing components (carbamide, ammonia nitrate, ammonia sulphate, ammonia thiosulphate, etc.). The concentrated phosphorus-potassium liquid fertilizer with microelements contains (in weight %): R2O5 from 14 to 26, K2O from 14 to 30, at least one of the following microelements: 0.01-1% V%, 0.002-0.2% So, 0.02-0.2% Su, 0.02-2% Re, 0.01-1% Mn, 0.001-0.1% Mo, 0.002-0.2% Zn and at least one chelate forming agent, preferably disodium salt of ethylenediaminetetraacetic acid. The liquid fertilizer is a clear green solution with maximal concentration of the main nutrition elements and verygood physical and chemical properties required for the leaf fertilizers: stability during prolonged storage, low crystallization temperature below 0?S, low salt index from 4.1 to 9.2, rN from 6.0 to 8.5, low evaporation rate, maximal buffer capacity, absence of creeping crystallization and corrosion activity. In accordance with the invention, the method for production of the liquid fertilizer consists of dissolving ortophosphoric acid and potassium hydroxide in a ôthermal bufferö û ready product, after which solution of microelements is added, obtained by dissolving inorganic salts of the microelements and chelate-forming agents in water.