INFLUENCE OF MINERAL FERTILIZERS ON PRODUCTIVITY AND QUALITY OF SPRING RAPE SEEDS DEPENDING ON DEGREE OF ACIDITY AND POTASSIUM SUPPLY ON SOD-PODSOLIC LOAMY SAND SOILS

Abstract

In article data on influence of acidity and supply on sod-podsolic loamy sand soils mobile potassium on productivity and quality of spring rape seeds are stated. It is established, that decrease in acidity of soil with рН_KCI 4,8-4,9 to рН_KCI 5,4-5,6 and рН_KCI 6,3-6,5 promotes growth of productivity of seeds on the control accordingly on 0,16 and 0,11 tha^{-1. In variants with fertilizers of an increase of productivity of seeds from decrease in acidity of soil increase and} accordingly make 0,16-0,5 and 0,15-0,41 tha^-1. At supply of soil mobile potassium 200-250 mg/kg the increase in doses of potash fertilizer from 90 to 150 kg/ha raises productivity of seeds from 0,13 to 0,58 tha^-1 at all levels of acidity of soil. The increase of productivity of seeds from 1 kg potassium against рН 4,8-4,9 makes 1,4-1,6 kg, against рН 5,4-5,6 - 1,9-2,6 kg, against рН 6,3-6,5 - 2,6-3,8 kg. With growth of supply of soil mobile potassium to 300-350 mg/kg for spring rape the dose of potassium 90 kg/ha is most effective. The increase in doses of potassium at this level to 120-150 kg/ha leads to decrease the increases of productivity of seeds.