Structural-aggregative state of a light-gray forest surface gleyed soil in various systems of its use

Abstract

Diagnostics of such important feature as the structure of soil cannot be based only on field studies of the morphology of the soil profile, but primarily should be supported and logically substantiated by analytical laboratory research. During the research process was chosen the optimal and available sieve method of modifying of N.I. Savinov, which results indicate the ratio of aggregates of different sizes and their water resistance in soil. To establish how the size of structure affects the properties and mode of soil and whether it is resistant to water movement and strong mechanical load.
 Are highlighted the study results of structural and aggregative state of light gray forest surface gleyed soil in fallow land and variants of 50-year-long agricultural use. It is established that the inclusion of soil in farming without fertilization and in systematic mineral fertilization promotes the formation of mezoaggregates, but also leads to significant powdering of them, which is confirmed by the morphological diagnosis of soil profile and poor water resistance. The structural condition of arable layers both of the control without fertilization and the variant of mineral fertilization by the amount content of agronomically valuable aggregates is better in comparing with the fallow (39, 6), and this is 55.1 on the control and 52.0 in the variant of only making mineral fertilization. The coefficient of structuring is 1.23% and 1.08% accordingly against 0.66% in fallow. These results can be connected, first of all, with feature of size distribution of light gray forest soil, which should be considered in their study.