THE EFFECT OF FOLIAR FERTILIZING ON THE PLUM YIELD AND THE CHEMICAL COMPOSITION OF PLUM LEAVES

Abstract

The effect of foliar fertilizing on the yield and the chemical composition of leaves from Stanley plum cultivar was determined. The variants were: Control (untreated); NPK+Ever green со Me (55% organic matter, 2% w/w Mg, 2% w/w Fe, 2% w/w Zn, 2% w/w Mn, 0.5 % w/w Cu, 0.5% w/w B); NPK+Biolinfa (34% organic matter 3% N, 5.80% K2O) and NPK+Oligomix (1.20% B, 0.10% Cu, 4% Fe, 1.50% Mn, 0.10% Mo, 2% Zn). The distance of fruit planting was 5 m row by row and 4 m in the rows. In each variant and repetition 20 plants were included, and total in all experiment 240 plants were involved. Three foliar treatments were applied with given above fertilizers at a concentration of 0.4%. At the end of November, soil fertilizing with the fertilizer Polyfeed NPK 11-44-11 (450 kg∙ha-1) was done. Soil agrochemical analyses were made, and was concluded good fertility with nitrogen, but medium fertility with phosphorus and potassium. The foliar fertilizing has a positive influence on the yield and the chemical composition of plum leaves. The highest (p<0.05) average plum fruit yield (18,255 kg∙ha-1) was determined in the variant treated with fertilizer NPK+Ever green with Me (55% organic matter, 2%w/w Mg, 2%w/w Fe, 2%w/w Zn, 2% w/w Mn, 0.5 %w/w Cu, 0.5 %w/w B). The lowest plum fruits yield (17,970 kg∙ha-1) was determined in the control variant. The highest average content of nitrogen (3.10%), phosphorus (0.35%) and potassium (2.15%) was determined in the variant NPK+Ever green со Me (55% organic matter, 2% w/w Mg, 2% w/w Fe, 2% w/w Zn, 2% w/w Mn, 0.5 % w/w Cu, 0.5% w/w B). The highest average content of calcium (2.12%) and magnesium (0.51%) were determined in the leaves from variant NPK+Oligomix (1.20% B, 0.10% Cu, 4% Fe, 1.50% Mn, 0.10% Mo, 2% Zn).