RESEARCH ON THE INFLUENCE OF ORGANIC AND MINERAL FERTILIZERS ON RAPESEED YIELD AND ASH COMPOSITION OF ITS OIL SEEDS

Abstract

The article presents results of a field experiment with application of mineral (NPK and zeolite) and organic fertilizers in the technology of spring rapeseed cultivation, as well as a comparative analysis of the ash composition of rape seeds of Rif variety, depending on the variants of the research. Six variants were studied: growing plants without fertilization (control); mineral fertilizer N60: P60: K60 alone and in combination with zeolite (5 t/ha); pure zeolite (5 t/ha); chicken manure (5 t/ha) alone and in combination with zeolite (5 t/ha). Accumulation of nine main elements (wt., %) contained in the ash of spring rapeseed seeds was studied by the method of energy dispersive spectrometry (X-Ray-analysis). The order of element accumulation was determined: P ≈ K>Mg ≥ Ca>Mo> S>Zn>Mn>Fe. The proportion of P is from 10.852 to 11.855 wt. %; the proportion of K is from 9.933 to 12.343 wt.%; Mg, Ca and Mo are present in rape seeds in similar concentrations within 4.0 -5.8 wt.%. Mutual usage of zeolite and organic fertilizer provided an increase of mineral accumulation in the seeds. Correlations between the elements were established. Higher level of macro- and microelements in seeds, necessary for humans, brings about good perspectives to create functional products based on the studied rape seeds for food enrichment. Positive effect of combined organo-mineral fertilizers on accumulation of mineral substances in rape seeds was established.