Humus balance in soddy-podzolic light loam soil by winter wheat cultivation at different nitrogenous feeding levels

Abstract

The results of the research into the effect of prevernal level of mineral nitrogen supply on the balance of humus in winter wheat crops in the layer of sod-podzol sandy loam soil 0–60 cm deep are given in the article.

It was discovered that the greatest rise in supply of humus is provided by the level of prevernal mineral nitrogen supply of 180 kg/ha in the soil layer 0–60 cm deep with two extra dressings of nitrogen fertilizers. The positive balance of humus from 208,0 kg/ha against the first prevernal nitrogen dressing to 501,9 kg/ha against the three nitrogen dressings is formed due to the nitrogen supply. The cultivation of winter wheat at the level of prevernal mineral nitrogen supplies of 120, 140 and 200 kg/ha leads to a substantial loss of humu.