Purtova L.N., Emelyanov A.N.
Mezhdunarodnyi sel'skokhozyaistvennyi zhurnal 2021; (383): 51-53
The effect of surface tillage, in a field experiment with sowing leguminous grasses and the use of fertilizers in the Primorsky Territory, on the physicochemical indicators of agrogenic soils, biological activity and the process of humus accumulation, has been investigated. The application of mineral fertilizers in all variants of the experiment significantly intensified the activity of microflora and the processes of transformation of organic matter. This contributed to the growth of enzymatic activity and was a positive moment in increasing soil fertility. It was found that the use of fertilizers (N45P60K60, N90P120K120) on the studied variants with surface treatment promoted the activation of microbiological processes and an increase in the activity of enzymes from the class of oxidoreductases (phenoloxidases, peroxidases). In most cases, an increase in the activity of these enzymes is characteristic of variants with an average level of humus. The values of the humification depth coefficient on the variants with harrowing with fertilization were higher than those in comparison with disking. The growth of enzymatic activity promoted an increase in the integral indicator of the biological state of soils. The activation of the process of humus accumulation was accompanied by an increase in the coefficient of the depth of humification. Higher values of CO2 emission, as one of the indicators of microbiological activity, were recorded for more humus-rich PU horizons of agrogenic soils. The enrichment in catalase (Ka) in the PU horizon of the studied soils varied from below average to average values. Soil disking (option 4 (control), option 6 (N90P120K120 + disking) promoted an increase in Ka. The degree of Ka enrichment of the PU horizon in these variants of the experiment is average. The parameters of CO2 emission, the content of enzymes to characterize the intensity of biological processes assess the level of soil fertility and their ecological state can be used.
