NPK TYPE EXTRARADICULAR FERTILIZER WITH HUMIC SUBSTANCES, PROCESS FOR OBTAINING AND METHOD FOR THE APPLICATION THEREOF

• Main Authors: SIRBU CARMEN EUGENIA, DUMITRU MIHAIL, CIOROIANU TRAIAN MIHAI
• Format: Patent
• Language: English; Romanian
• Published: 30.10.2012
• Subjects: CHEMISTRY; FERTILISERS; MANUFACTURE THEREOF; METALLURGY; NITROGENOUS FERTILISERS

The invention relates to a fertilizer, a process for obtaining the same and a method for application. According to the invention, the fertilizer comprises 55.6...165.69 g/l total nitrogen, 32.41...70.2 g/l phosphorus pentoxide, 30.92...58.4 g/l potassium oxide and microelements consisting of copper, zinc, iron, manganese and magnesium, completely chelated with disodium salt EDTA, boron, sulphur and 23.65...35.89 g/l of organic substances of which 8.04...20.09 g/l of humic substances. The process claimed by the invention consists in neutralizing the phosphoric acid of 85% concentration with 98% potassium carbonate, while continuously stirring at 28...30°C, to result a solution containing a monopotassium phosphate:dipotassium phosphate ratio = 0.75:2.30 to which there is added urea and ammonium sulphate, a solution of microelements chelated with disodium salt EDTA, glucose and a potassium humate solution having a concentration of 40.2 g/l of humic acids and 7...8 g/l of potassium oxide. The method for the application of the fertilizer consists in administering an aqueous fertilizer solution with a concentration of 0.01...25%, in an amount of 200...10000 l/ha, depending on the fertilizer type, crop and vegetation stage. Invenţia se referă la un fertilizant, la un procedeu de obţinere a acestuia şi la o metodă de aplicare. Fertilizantul conform invenţiei conţine 55,6...165,69 g/l azot total, 32,41...70,2 g/l pentoxid de fosfor, 30,92...58,4 g/l oxid de potasiu şi microelemente constând din cupru, zinc, fier, mangan şi magneziu, complet chelatizate cu sarea disodică a EDTA, bor, sulf şi 23,65...35,89 g/l substanţe organice, din care 8,04...20,09 g/l substanţe humice. Procedeul conform invenţiei constă din neutralizarea acidului fosforic de concentraţie 85% cu carbonat de potasiu 98%, sub agitare continuă la 28...30°C, rezultând o soluţie conţinând un raport fosfat monopotasic:fosfat dipotasic = 0,75:2,30, la care se adaugă uree şi sulfat de amoniu, o soluţie de microelemente chelate cu sare disodică a EDTA, glucoză şi o soluţie de humat de potasiu având o concentraţie de 40,2 g/l acizi humici şi 7...8 g/l oxid de potasiu. Metoda de aplicare a fertilizantului constă în administrarea unei soluţii apoase de fertilizant, cu concentraţie de 0,01...25%, în cantitate de 200...10000l/ha, în funcţie de tipul de fertilizare, cultură şi de faza de vegetaţie.