Changes in Agrochemical and Agrophysical Properties of Drained Meadow Undergrasses during Fallow Succession

The agrochemical and agrophysical properties of meadow whitewash (Haplic Gleysols) of sedimentary drained soils of different ages located in the Daursky Massif land reclamation system in the Jewish Autonomous Region have been studied. The data obtained indicated that drained agricultural lands, withdrawn from agricultural circulation, require a long time to recover. Vegetation growth and root development were observed in the absence of tillage. Sod 6-7 cm thick was formed on a 10-year-old deposit, and up to 12-13 cm thick on a 25-year-old deposit, which contributed to loosening of the soil. In areas with a 25-year deposit, the humus content increased (C = 5.1%) compared with arable land (C = 2.8%). The amount of mobile forms of phosphorus and potassium under soybean crops was determined as average for PO and very high for KO. The withdrawal of land from agricultural circulation gradually improved its structure, where the coefficient of structurality (K) increased from 0.9 on arable land to 1.9 after 25 years without cultivation.