Published in Scientific Papers. Series A. Agronomy, Vol. LXIV, Issue 1
Written by Emilia NICU, Traian Mihai CIOROIANU, Mihail DUMITRU, Carmen SÎRBU, Claudia Elena PREDA
It is known that extraradicular fertilizers or those containing substances that have a growth-stimulating effect indicated that only the use of biostimulants in the treatment of crops does not often lead to significant effects on production and quality. In these cases, the "explosive" vegetative development of the plant must be supported by an additional nutrients contribution necessary for nutrition. This phenomenon is obvious in the case of poor basic fertilization, on degraded soils, as well as in the case of unbalanced fertilization in macronutrients. The carried out research aimed to establish, using as a 15N isotope tracer, the contribution of foliar fertilizers containing natural organic substances, to increase the efficiency of the use of different forms of nitrogen from the soil applied fertilizer. The efficient use of nitrogen has a positive effect on the quality of the sunflower crop. The incorporation into the NPK matrix with protein hydrolysate, substances that also have a role of biostimulator has led to increases in the production of green mass, up to 6% compared to the control fertilizer.
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