DEVELOPMENT OF A NOVEL FOLIAR FERTILIZER WITH ZINC
Zinc deficiency, resulted from various stress factors, limits agricultural production worldwide. Therefore, research into developing sustainable methods to alleviate this type of deficiency should be a priority. This study presents the development of a new foliar fertlizer, focusing on its formulation, characterization, and testing. The fertilizer formula associates a classic NPK and micronutrients (Cu, Zn, Fe, Mn) matrix with organic substances having bio-stimulating effect: humic acids and algae extracts. The composition of the experimental fertilizer (8.2% N, 3.9% P, 3.6% K, 0.8% Zn) is formulated to prevent and correct imbalances in plant mineral nutrition, especially those caused by zinc deficiency. A set of field trials were conducted in order to assess the effect of the fertilizer on grapevine (cv Chasslas dore) and maize (DKC 4590). Experimental data indicated that application of the foliar fertilizer had signifficant contribution to the improvment of yield, leaf nutrient and chlorophyll content, and crop quality parameters.