The effect of the solid fraction of pig manure on the biological activity of agrochernozem

Abstract

The results of studies in 2016-2019 on the effect of the solid fraction of pig manure, applied at doses of 20-60 t/ha, on the indicators of the biological activity of the agrochernozem of loamy quasi-gley medium-arable medium with a low carbon content of organic matter (1.14-1.22%) are presented. The manure contained 0.59% of N, 1.13% of P2O5, 0.14% of K2O, 82.1% of organic matter at pH = 7.4. In field experiments carried out at the experimental field of the Omsk State Agrarian University (Omsk), the cellulose-destroying capacity of the soil and the activity of the enzymes catalase, urease and invertase were studied. The soil of the control variant had a weak cellulose-degrading capacity and was poor in the content of the studied enzymes. The results of the experiments indicate a positive effect of pig manure on the activity of biological processes in the soil. The cellulose-degrading capacity of agrochernozem depended on the dose of manure and the hydrothermal conditions of the growing season. In the period from the first to the third years of manure aftereffect, the intensity of cellulose destruction increased in comparison with the control by 20-90% at a dose of 20 t/ha and by 70-230% at a dose of 60 t/ha. Organic fertilization increased the activity of urease by 34.6-68.0%, by 10.7-14.6% that of catalase and by 5.8-12.2% that of invertase.