Dynamics of physicochemical indicators using various fertilization systems on sod-podzolic sandy loam soil and their Influence on Crop Productivity

Abstract

As a result of the studies carried out by the Department of Chemistry, Agrochemistry and Agroecology to improve the physicochemical parameters of sod-podzolic soils in the conditions of the Pskov region, positive results were obtained. It was noted that on the sod-podzolic sandy loam soil in the period from 2016 to 2019, in the control option, there was a gradual increase in soil acidity over the years. For 5 years, the exchange acidity increased by 0.1 units, and the hydrolytic acidity of the soil by 0.07 meq/100 g of soil. Against the background with mineral fertilizers, as well as in the control, during the study period there was no decrease in the value of exchangeable acidity, and the increase in hydrolytic acidity was not significant by 0.02 meq/100 g of soil, respectively, in relation to 2016. Application of manure in the amount of 30 and 40 t/ha contributed to a significant improvement in the acid-base state of the soil. During the years under study, exchangeable acidity decreased by 0.7-1.1 units (from 5.8 to 6.1 units), and the hydrolytic acidity of the soil decreased by 0.08 meq/100 g of soil due to the influx of stubble-root residues. Application of manure reduced the negative indicators of the Ca and Mg balance by 564 kg/ha or by 83 %, and in the organomineral and mineral options only by 64 and 39 %, respectively. The results of studies on sandy loamy sod-podzolic soil also showed a high efficiency of the influence of fertilization systems on the productivity of crops in the crop rotation link. The best performance indicators were obtained from the organomineral fertilization system.