Influence of increasing doses of mineral fertilizers on the fractional composition and quality of various fractions of malting barley grain

Changes in the fractional composition and quality of various fractions of malting barley grain under the influence of increasing doses of mineral fertilizers were studied. It is shown that in years contrasting with the hydrothermal regime, grain yields changed due to the redistribution of the relative fraction of fractions. At the same time, the relative fraction of fractions (%) in the grain yield did not depend on the doses of mineral fertilizers. With an increase in grain thickness from its minimum values, the relative fraction of the fraction in the grain yield increased, while each subsequent increase in grain thickness slowed down its growth rate and, reaching the maximum point, it decreased. The yield (c/ha) of all fractions increased with increasing doses of mineral fertilizers and grain thickness, however, the rate of yield growth of each individual fraction varied significantly depending on the grain thickness. The minimum grain yield increases compared to the previous fertilizer dose were noted in the smallest (2.2–2.4) and largest fractions (3.2–3.4), the maximum in the average grain fraction 2.8–3.0 mm. The dependences of the main indicators of the quality of malting barley grain on increasing doses of mineral fertilizers (X₁) and grain thickness (X₂) reflected the equations of the 2nd order as accurately as possible (in terms of R²). The experimental values of the main quality indicators of the initial samples of malting barley grain and their weighted averages practically did not differ and in the vast majority of cases did not exceed the expected discrepancies regulated by the relevant GOST standards.