The influence of mineral fertilizers on the formation of dry matter and the yield of spring rapeseed in the conditions of Northern Kazakhstan

Relevance. The current trend in the development of agricultural production is the cultivation of spring rape, as a highly profitable and export crop. Mineral nutrition is an integral part of increasing the resistance of rapeseed to adverse environmental factors, increasing and stabilizing yields.
The purpose of the research is to evaluate the effectiveness of various forms and norms of mineral fertilizers on the yield and morphobiological parameters of spring rape.
Methods. Field experiments were laid on the experimental field of the North Kazakhstan Agricultural Academy in 2018–2020. The climate of the zone is arid, the sum of positive temperatures is 2400–2700 °C, the average annual precipitation is 240–330 mm, GTC is 0.8–0.7. The soil is ordinary heavy loamy chernozem with a neutral reaction, humus is 4.5–5.0%.
The object of the study is a hybrid of spring rapeseed SALSA CL F1 (00-type, medium early). Records and observations were carried out according to current state standards, as well as the methodology for conducting state variety testing of agricultural crops.
Results. As a result of the research, it was found that the use of various types and norms of mineral fertilizers provides an increase in the yield of spring rapeseed of 0.42–0.68 t/ha. The greatest effect was obtained for the P80:N80 nitroammophos variant, with a yield of 1.72 t/ha, exceeding the standard by 64%. These facts are confirmed by the structural analysis of the obtained crop, as well as observations of the dynamics of the increase in dry matter.

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