Abstract
The article presents the results of the computational method for determining the potential danger of water erosion and quantitative agrophysical and agrochemical indicators obtained by traditional methods of their direct measurement. When calculating losses as a result of water erosion in agro-sodpodzolic loamy weak eroded soil, the universal soil loss equation of Wischmeier and Smith (1965) was used, the variables in which are the erosive power of precipitation, erosiveness of soil, length and steepness of slope, character of vegetative ground cover and influence of erosion control soil protection measures. The obtained values of soil losses from 1,8 to 12,1 t/ha a year are confirmed by the change of soil organic matter content during the rotation of six-course grain-grass-fallow crop rotation from 2,48 to 1,65% according to I.V. Tyurin depending on agrochemical background as well as soil density 1,31–1,60 g/cm3, its structural state and content of microaggregates unstable to water erosion from 7,3 to 14,6%. The dependence of the selected informative signs on the system of main tillage of agrosod- podzolic loamy soil has been determined. Сlose correlations between the content of microaggregates and soil density (r = – 0,49) and the content of organic matter related to it (r = – 0,74) were established. The analysis of variance allowed to trace the influence of the main tillage system on the accumulation and distribution of in the arable horizon at different levels of the fertility of the agro-sod-podzolic loamy soil. The more intensive development of erosion processes at the annual plowing was revealed.
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