PRODUCTIVITY, REMOVAL AND BATTERY REMOVAL FACTORS, DEPENDING ON WEATHER CONDITIONS AND THE FERTILIZER SYSTEM USED FOR SPRING BARLEY

Abstract

The article presents the results of studies assessing the impact of fertilizer systems, weather and soil conditions on yields, carrying and compensation factors for the removal of nutrients by spring barley on sod-podzolic light loamy highly rich mobile forms of phosphorus and potassium. The optimal fertilizer system is the complex application of nitrogen at a dose of N₉₀₊₃₀ (main and additional feeding), P₂₀K₄₅ against the background of manure (60 t/ha), which provides an increase of 28,6 t/ha or 82 % of control, contributes to stabilization yield by years (CV = 16 %). Under adverse weather conditions in the formation of barley yields, the participation of fertilizers increases (up to 51, of which nitrogen is up to 44 %). With an optimal fertilizer system, the specific nitrogen removal rate averaged 17,7; phosphorus - 10,2 and potassium - 18,5 kg/ton of basic with the corresponding amount of by-products. For the studied soils, the optimal recovery factors for the removal of nutrients by the crop of fertilizers are: N - 1,1; Р₂О₅ - 0,3 and К₂О - 0,4.