EFFICIENCY OF PEA CULTIVATION AT DIFFERENT LEVELS OF MAGNESIUM SUPPLY OF LUVISOL LOAMY SOIL

Abstract

The evaluation of the efficiency of mineral fertilizers at the cultivation of реа on sod-podzolic loamy soil with different content of exchangeable magnesium in the soil was carried out. It was found on control plots without fertilizers the yield was increased on 26 % in the range of Mg content 46-147 mg/kg of soil. Further increase of Mg content in soil up to 198 mg/kg was excessive; it followed by reduction of grain yield on 3,5 %. The crude protein content in the pea grain was positively influenced by fertilizers as well as by the increasing levels of soil magnesium supply. Maximal yield response 1,88-1,94 t/ha to basic NPK treatment and response to foliar spray of Mg fertilizer with 60 kg S was noted on low content of exchangeable Mg 46-50 mg/kg in soil with total net return of 157,2-162,6 USD/ha with a profitability of 101,5-101,9 %. Efficiency of NPK and Mg fertilizer treatments were strongly reduced on the plots with high level of Mg soil supply.