EFFECT OF THE AUTUMN-SUMMER REGIME OF NITROGEN NUTRITION OF WINTER WHEAT, GROWN ON CHERNOZEMS OF THE ORENBURG REGION, ON ITS GRAIN YIELDS
The field experiments with Pionerskaya-32 winter wheat variety were carried out in the system of crop rotation on the fields of the Orenburg State Agrarian University. It is ascertained that the regulated regime of mineral nutrition of winter wheat, grown on southern chernozem soils of the Orenburg Preduralye, which was sown in the period of the third decade of August - first decade of September, stimulated significant improvement of growing processes in the winter wheat agrocenoses and resulted in the 2.7-4.6 cwt/ha yields increase (11.0-18.7%). The highest yield increase (29.1 cwt/ha) of wheat grain with standard moisture content was obtained in the trial with the standard rate of the complete mineral fertilizer N39P16K16, of which the N16P16K16 fertilizer was applied during the late autumn top-dressing together with the seeds and N23 by means of the AYP-18.05 seed drill.