The quality of spring rape seeds and its dependence on the doses of mineral fertilizers under the conditions of Southern Urals

Spring rape is a high-marginal crop that can be used in different areas of the national economy. Despite this, the area used for sowing this crop in the Russian Federation is still small, and the quality of its seeds does not always meet the standards. The purpose of the research is to identify the most effective doses of mineral fertilizers that allow obtaining the planned harvest of high-quality spring rape seeds in the southern forest-steppe of the Republic of Bashkortostan. The paper presents the results of triennial field researches (2016–2018) on the effect of mineral fertilizers on some indicators of the quality of spring rape seeds of the Iubileynyi variety. The research was carried out in the educational and scientific center of Bashkir State Agrarian University (Ufa, the Russian Federation) on leached black soils of heavy loam granulometric composition. The positive effect of calculated doses of mineral fertilizers on the object of interest was evident. Fertilization increased the spring rape yield capacity and its oil content by 0.34–0.51 t ha-1 and 0.1–1.8%, respectively. The yield of oil per hectare also increased. The use of fertilizers increased the content of nitrogen and potassium, averaging over three years 3.32–3.36% and 1.00–1.03%, respectively. The use of fertilizers did not significantly effect the content of phosphorus. The content of phosphorus did not exceed 1.74–1.79%. Crude protein content was 19.4–19.6% for researched period