Agrochemical Parameters of the Fertility of the Arable Meadows Differentiated Soils of the Primorsky Region in the Conditions of Long-Term Agricultural Use

Abstract

The results of studies of the agrochemical properties of meadow differentiated soils of reference plots that have been in agricultural circulation for a long period are presented. The humus content, exchange acidity and the degree of saturation with bases have not changed much over 35 years of intensive soil use in agriculture. A decrease of hydrolytic acidity and the content of available phosphorus, as well as a significant increase in the content of exchangeable potassium was revealed. A trend towards a decrease in the content of exchange bases was noted. The calculated complex indicator of the agrochemical state of the soil indicates the multidirectional change in soil fertility in the studied areas, which is associated with differences in the availability of mobile forms of phosphorus and humus. The need for the widespread application of phosphorus fertilizers and a decrease in the differentiation of soil fertility in various areas has been identified.