The effect of the last entrance of culture on the species diversity and growing fields productivity

The effect of the last cultivated crop on the species diversity and productivity of a short-term (three-year) deposit was studied when the intensive use of arable land was stopped. The studies were carried out on the basis of many years of field agricultural experience, some of the variants of which were left for natural overgrowing. It is established that the last crop rotation has a significant impact on the species composition of the emerging short-term deposit only in the first year of overgrowing. In the second and third year, the number and types of plants in the developing phytocenosis are determined by weeds and are represented by their most common species in a given territory. As costs forms, the share of perennial plant species in the composition of herbage in the short-term fallow and reduction of annual species increases. In the third year of overgrowing, typical plants occur on forest edges and in the forest, including tree-shrub vegetation, appear in the herbage. The productivity of green mass of herbaceous plants already in the second year of overgrowing is sharply reduced and already depends little on the initial crop of crop rotation.