Value of Basic Soil Criteria in Formation of Soil Fertility

The article clarifies the significance of many soil criteria in the formation of fertility. Through field and office research, it has been proven that soil fertility and productivity mainly depend on the supply of humus, nitrogen, phosphorus, the amount of absorbed bases and the reaction of the soil. Close connections of yield of cereals, cotton, grapes, tea, natural herbs were revealed. The yield of some crops, for example, tea and citrus fruits, depends on metabolic and hydrolytic acidities. Indicators of properties of productivity, correlation coefficients vary within 58-99. In addition to the main criteria of soils, the grain size distribution, salinity, gley process, etc., play an important role in the yield of agricultural crops. Revealed the correction factors for these indicators.