Results of the changes in the physicochemical properties and fractional group composition of the humus-leached chernozem under the influence of fertilizers and ameliorant

Abstract

Currently, in the Russian Federation there is a tendency towards a decrease in the content of organic substance in the soil and its acidification. It is impossible to stop these processes without applying organic fertilizers and calcium containing ameliorants. Their effect on the soil properties depends on the edaphoclimatic conditions. In order to study the effect of fertilizers and ameliorants on the fertility of leached chernozem in the forest-steppe zone of the Central Black Earth zone of the Voronezh region in 2018 – field experiments were conducted. The results showed that prolonged application of mineral fertilizers led to the acidification of the soil both against the background of exposure to organic substances and liming. Reliming calcification of the leached chernozem contributed to a noticeable decrease in soil acidity (pHKCl increased by 0.7-1.0, Hr decreased by 2.1-2.9 mg-Eq/100 g of soil, the content of exchange forms of calcium and magnesium increased to 26.2-26.9 mg-Eq/100 g of soil). Some optimization of the acidity of the soil was also observed even with the reapplication of manure. The calcification of the soil led to the optimization of its fractional-group composition of humus.