CORRELATION DEPENDENCE OF MOISTURE RESERVES IN FALLOWS FROM ATMOSPHЕRIC PRECIPITATION OF THE YEAR DEPENDING ON THE MAIN TYPES OF TILLAGE

Abstract

The correlation method between climatic and soil factors allows us to reveal a close correlation dependence of these components and to select the effective and adapted for a dry-steppe zone tillage allowing more than others to accumulate moisture in the soil irrespective of hydrothermal conditions of the year. Studying the influence of deep (moldboard and subsoil) and shallow (surface) tillage on the assimilation of precipitation during the spring-summer fallow period allows us to obtain data that can deduce the correlation dependence of varying degrees of intensity and identify the most suitable technology for our dry-steppe zone. The effect of precipitation on the moisture reserves in the soil directly depends on the choice of tillage. The assimilation of precipitation occurs in different ways, and the main role is played by the moisture supply of the year. Weather conditions for the autumn-winter period of the studied years showed that the instability of the frost period led to the runoff of meltwater and low assimilation. The conducted correlation analysis revealed that a large coefficient of determination from precipitation is shown on the moldboard and surface tillage, and on the surface technology it is higher both in the layer of 0-0,30 m and in the meter layer, which indicates the imperfection of this technology in our zone. On the moldboard background, the coefficient of determination in the meter layer is almost 2 times higher than in the upper productive layer. The lowest coefficient of determination is on the subsoil tillage, which makes it less dependent on precipitation. This condition, with insufficient moisture, makes the subsurface tillage the most adapted for our zone.