Reaction of winter rye on top-dressing to nitrogen fertilization at different level of mobile phosphorus and potassium in the soil

Abstract

The article presents the results of assessing the effectiveness of methods for fertilizing winter rye with nitrogen, grown on soils with different levels of mobile forms of phosphorus and potassium. The studies were carried out in field experiments located on sod-podzolic heavy loamy soil. It has been established that with an increase in the content of available phosphorus in the soil to a level of more than 250 mg/kg, it leads to a mathematically proven increase in the productivity of winter rye by 1.0 c/ha (tfact.(10.0) > tcrit.(2.0)) (C - here and below 1 center (c) = 100 kg center). An increase in the amount of mobile potassium in the soil (> 120 mg/kg) contributes to a significant decrease in grain yield by 18.1 c/ha (tfact.(19.9) > tcrit.(2.0)). The fertilizing carried out contributed to a mathematically proven increase in the productivity of winter rye by 1.0-2.3 c/ha (tfact.(10.7-13.1) > tcrit.(2.0)). On average, the local method of fertilizing, compared to the spreading method, provided a greater increase in grain yield relative to the control (2.3 c/ha).