OIL CONTENT IN WINTER RAPE SEEDS DEPENDING ON MICRONUTRIENT NUTRITION

Abstract

The article is devoted to the study of the role of micronutrients in their application in the form of foliar fertilization in view of their influence on the quality indicators of the formed crop, in particular on the oil content of seeds as a basic indicator that determines the value of winter rape as a crop for multipurpose use. The effectiveness of monocomponent application of the main physiologically active microelements in two phenological critical phases of growth and flowering of winter rape plants with different dominance of growth and growth-reproductive processes of plant organism differentiation - in the phenological phases of stemming and flowering - was investigated. The effectiveness of the influence of single-component microelements selected by the typological composition of modern multicomponent chelated microfertilizers in the form of sulfate salts, boric acid and ammonium sulfate at a physiological concentration of 0.2 %, taking into account the regulation of concentrations of physiologically active agrochemicals in the format of foliar feeding with aqueous salt solutions, was determined. It was found that the use of each of the studied microelements was effective and significant in terms of increasing the oil content of seeds in comparison with the control variant of water treatment. Individual peculiarities of seed oil content formation for two high-intensity varieties of winter rape for each of the studied microelements were established both from the standpoint of the increase in oil content to the control and from the standpoint of assessing the variability of its value, taking into account the two-year cycle of study and variation within the general set of the obtained accounting values within the replications of the experiment. On the basis of the data obtained, the expediency of the timing of foliar fertilization with microfertilizers of winter rape hybrids was determined and the role of the genotypic component in the effectiveness of the use of corrective foliar fertilization with various microelements was noted. It was established on the basis of a two-year research cycle for a guaranteed increase of oil content in seeds of intensive winter rape hybrids by at least 0.6-1, 8 % under the condition of one-component use of trace elements in the form of foliar feeding, they should be used in the following order of increasing expediency and validity of Co>Zn>B>Cu>Mn>Mo in the form of a solution of salt sulfates, boric acid and ammonium molybdate at 0.2 % concentration of the working solution for foliar feeding. Prospects for further research in the field of optimization of fertilization of intensive hybrids of winter rape with microfertilizers are formulated.