Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Daniela MIHALACHE, Carmen SÎRBU, Traian Mihai CIOROIANU, Olga GAŢE

Development of new formulas of extra-radicular fertilizers applied by irrigation, drip irrigation or by soil incorporation is a priority both for manufacturers and for users in agriculture. At worldwide level it was observed a major development of the fertilizers which consist of natural organic substances or synthetic integrated in NPK type structures with/without trace and meso elements, products which can be applied conventional of extra-radicular type. Adding of the organic substances have the role to stimulate the absortion of the nutrients and to provide a balanced nutrition. The most commonly used organic substances are protein hydrolysates of vegetal or animal origin and various aminoacids. In order to obtain a new range of fertilizers it was defined the composition of a type NPK with mezo and micronutrients, such as Fe, Cu, Zn, Mn, Mg, S, Co, Mo, and in which protein hydrolysate of vegetal or animal origin were introduced. The experimental fertilizers were characterized from physico-chemical and agrochemical point of view within the National Network for Fertilizers Testing for authorization for agricultural use. This paper presents the obtained experimental fertilizers and the results of the agrochemical tests carried out by the National Network for Fertilizers Testing, fertilizers which were applied to maize, sugar beet, eggplant and tomatoes crops. These extra-radicular fertilizers represent modern technologies of fertilization and have quantitative and qualitative significant effects, but also with a positive impact on the economy and environment.

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