EFFECT DIFFERENT LEVELS OF EXCHANGEBLE MAGNESIUM IN THE PODZOLUVISOL LOAM SOIL AND MINERAL FERTILIZERS ON THE YIELD AND BIOCHEMICAL QUALITY OF CORN GRAIN

Abstract

As a result of model stationary field experiment with different exchangeable magnesium content in the podzoluvisol loam soil (1 n КСl) 74-120-181-240 mg Mg/kg and varying Ca:Mg ratios 10,7-6,5-3,9-2,7 it was found increasing corn grain yield on 5-13 % (6,9-15,2 c/ha) in the soil with Mg content 74-181 mg/kg and equivalent Са:Mg ratio 3,9. Subsequent increasing exchangeable magnesium content to 240 mg/kg and narrowing Са:Mg ratio to 2,7 was result to small decrease corn grain yield. Carring out foliar spray of corn plant by magnesium sulfate was effective at exchangeable magnesium content 74 and 120 mg/kg with yield response 7,4 and 6,6 c/ha correspondingly. Raw protein content in corn grain essential increased (on 0,9-1,5 %) in result of application basic system of fertiliser N₁₁₀₊₃₀P₆₀K₁₂₀ and sulfur fertilisers, highest raw protein (9,6 %) was obtained at 181 mg/kg exchangeable magnesium content. Amino acid composition of corn protein and biological value of critical and essential amino acids was change a little against investigate factors.