Importance of Providing Soils with Mobile Potassium in Increasing the Yield and Efficiency of Nitrogen Fertilizers

The results of a study devoted to the study of the effect of the content of mobile potassium in various soils on the yield of major crops and the effectiveness of the use of nitrogen fertilizers for them are presented. According to the data obtained, the availability of mobile potassium in soils plays a very significant role in increasing the yield of cereals, potatoes and flax. To the greatest extent, this affected sod-podzolic soils, on which the yield increase was higher due to an increase in their potash level and a higher return on nitrogen fertilizers. Among the studied crops, winter wheat stood out, which reacts better than others not only to an increase in the K₂O content in the soil, but also in general to their agrochemical cultivation. On sod-podzolic and gray forest soils, its yield increased 3 times, on leached chernozems – 2.5 times, whereas on the same soils, the yield of spring wheat increased 1.2–1.3 times, potatoes – 1.5 times and flax, depending on the predecessor – 1.7–1.9 times. The dependence of the efficiency of nitrogen fertilizers on the content of mobile potassium in soils has been established.