Influence of methods of primary soil treatment on winter rape-seed productivity on leached chernozem of Northern Precaucasus

The systems of the primary soil treatment under winter rapeseed were studied in stationary experience of VNIIMK in 2006-2009. On leached chernozem of Northern Precaucasus, in a zone of insufficient moistening, the greatest productivity of winter rapeseed seeds (2.47-2.54 t ha-1) and oil yield (1.03-1.15 t ha-1) are formed at intensive system of the primary soil treatment (moldboard plowing, bastard fallow). Under favorable weather conditions of autumn, promoting optimization of a water and air mode of soil, its agrophysical characteristics, the greatest seed and oil yields of winter rapeseed are formed at shallow (4.34 and 1.69 t ha-1) and intensive (4.23 and 1.64 t ha-1) soil treatments. Deep, shallow moldboardless and surface soil treatments promote decrease of winter rapeseed seeds yield on 8-20%.