EFFICIENCY OF APPLICATION OF GRADED RATES OF MINERAL FERTILIZERS FOR SPRING RAPE ON SOD-PODZOLIC LOW LOAMY SOILS WITH DIFFERENT DEGREE OF EROSION

Abstract

On cespitose and podzolic sandy loam soils of different degree of erodibility application of the differentiated doses of nitric, phosphoric and potash fertilizers under a summer colza is studied. It is established that on not washed away soil the greatest net income of 3298 thousands of Belarusian rub/ha and profitability of 165% provides application of N₁₁₀P₃₀K₆₀.It has been found that on non-eroded soil the greatest net is 3 298 thousands of Belarusian rub/ha and application of N₁₁₀P₃₀K₆₀ provides 165% profitability. Economic efficiency of chemical fertilizers on erodible soils is lower than on non-erodible soils. On middle-eroded soil N₁₂₀Р₄₀К₇₀ application is the most efficient - net income is 3017 thousands of Belarusian rub/ha and the profitability is 132%. On highly-eroded soil the doses of N₁₃₀P₅₀K₈₀ provide the greatest net income (2275 thousand rub/ha), while N₁₃₀P₃₀K₆₀ doses provide the highest profitability. In agricultural landscapes with short slopes and the preponderance of the upland part over the slope it is reasonable to apply mineral fertilizers in an average recommended dose for culture without considering relief elements or degree of soil erosion. In the landscaped massifs with long and medium-long slope and parity of upland and slope parts, as well as the preponderance of the slope over the upland, it is more efficiently an application of differentiated according to the degree of soil erosion doses of nitrogen fertilizer, but phosphate and potash fertilizers - in doses, calculated on the positive balance of macronutrients, depending on the availability of soil varying degrees of erosion.