COMPAUNDS OF MOBILE FRACTION HUMIE SUBSTANCES OF SOD-PODZOLIC LIGHT LOAM SOIL DEPENDING ON SYSTEMS OF FERTILIZER

Abstract

Liming of sod-podzolic light loam soil with рНKCl 4,3-4,5 promoted the decrease in lability of soil humus due to decrease in labile fraction of humic acids on 303 mg/kg, fulvic acids on 700 mg/kg of soil. Under influence of organic fertilizers the contents of labile humic acids has increased for 1140-1519 mg/kg of soil, fulvic acids has decreased for 164-264 mg/kg of soil. The most effective way to increaseof contents of labile humic acids in soil was joint application of 12,5 т/га in one year of manure and N₈₃Р₆₁К₁₁₂ fertilizers on a limed background. The greatest supply of mobile humus and humic acids is observed to variants with organic-mineral system of fertilization. The maximal supply of mobile fulvic acids are typical for variants with application of mineral system of fertilizer.