Specific features of changing the structure of migration-mycelium agrochernozems depending on duration of their use in crop farming

Abstract

Probed the structural state of migration-micellar agrochernozems depending on duration of their use in agriculture. The results of structural analysis were to that end considered on N.I. Savinov (dry and wet sifting), got through 9, 12, 15, 17, 20, 60 and 120 years after throwing of migration-micellar agrochernozems open on a long-term bed. It is rotined that most destruction of grainy structure of these soils takes place already at their primary throwing open. Duration of the further agricultural use did not result in the meaningful worsening of the structural state. Change of coefficient structuralness and maintenance of factions agronomical a valuable structure during the 120 years period of the agricultural use of agrochernozems of a Stone Steppe did not take place within the framework of single tendency. Not only diminishing but also periodic increase of these indexes is marked in soils depending on the term of their use under plough-land, that, morally, it is related to character of mechanical influence of treatment on soil and level of entering it of vegetable tailings. Stability to water of structure in agrochernozems of the mowed bed and all plough-lands of different age corresponds higher gradations of quality of this property. However, in a prospect with the increase of age of plough-land it is necessary to expect substantial addition to faction, containing aggregates measuring less than 0,25 mm. It inevitably will result in the sharp falling of stability to water of structure from positions of existent criteria.