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INFLUENCE OF FOLIAR FERTILIZATION WITH 15N-LABELLED FERTILIZERS ON THE SUNFLOWER CROP
Abstract
The researches carried out aimed at assessing foliar fertilization bio stimulating effect by increasing fertilizers nutrient use efficiency and their absorption into plants. Foliar fertilizing variants NPK were formulated during the research activities on a PK type matrix base with secondary nutrients and trace elements. The nitrogen source consisted of urea and ammonium nitrate in which 6% of the total nitrogen content was added as 15N isotope to the basic PK type matrix. Agrochemical testing were carried out on sunflower as test plant, Neoma variety (the plant has the advantage of a leaves surface with high retention power of the applied foliar fertilizer). The effects of the studied experimental factor on vegetal biomass, macronutrients and secondary nutrients concentrations, and macro nutrients export were assessed. The experiment was carried out with one factor, A ? the chemical nature of foliar nitrogen source (15N-labelled urea and 15N-labelled ammonium nitrate). The experimental data were statistically computed by ANOVA using Duncan multiple comparison test, significance level ?=0.05. Excel, XLStat, and SPSS 14.0 programs were used for graphic and statistic presentations.
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