Effectiveness of a soil light rolling in the time of cereals sowing in the southern forest-steppe of Western Siberia

In this article are presented some results of the effectiveness research of an after-sowing soil light rolling on black-earth soils of the southern forest-steppe of Western Siberia. Additional soil compacting by the ring-spiral roller contributed to an increase in the lumpiness of the upper layer in all soil variations by an average of 5.8% and a decrease in the erodibility of the field surface by 14.4%, with weak soil compliance to deflation (less than 50 g). The density of complete crop outflows from the application of additional packing was increased in the studied variants by an average of 11.3%, with a decrease in seed embedding depth by 0.4-0.9 cm. This agrarian method does optimum composing of the upper soil stratum and secures on the land ploughed in autumn for spring sowing (using mould-board and flat-cutter versions) additional corn increase after sowing by the use of the drill seeder SKP-2.1, namely: winter rye - 0.15-0.17 t/ha (5.4-6.2%); durum - 0.14-0.23 t/ha (6.1-11.0%); wheat after the fallow land - 0.09-0.15 t/ha (4.2-7.2%). The additional rolling by minimum soil cultivation versions and by an upper soil stratum density to be near to the optimum one (1.08-1.15 g/cm3) does not secure any positive results. The post-sowing light rolling after sowing by use of drill seeder complexes with arrow-shaped ploughshares on the autumn ploughing grounds does optimum composing of the upper soil stratum and favoures the rise of cereals productivity - 2.52-2.74 t/ha (8.7%).