EFFECT OF PLANTING DATE, SOWING NORM AND FERTILIZATION NORM ON THE YIELD AND YIELD COMPONENTS OF WINTER BREAD WHEAT VARIETIES UNDER THE SOUTHERN REGIONS OF THE REPUBLIC OF UZBEKISTAN

Nowadays, high grain yields are being achieved by using the internal potential of winter bread wheat varieties that grown in the country and the use of intensive agricultural techniques.However, insufficient attention has been paid to agro-techniques for the cultivation of intensive varieties of winter bread wheat, including the development of planting dates, norms, and fertilization procedures according to each cultivar's biological characteristics, especially in the conditions of the desert areas of Kashkadarya region.

Field experiments Production experiments were conducted in 2014-2016 and 2016-2017 in the pale gray soils of the experimental fields of the Kashkadarya branch of the Research Institute of Grain and Leguminious crops.

New Yaksart, Bunyodkor, Gozgon varieties of bread wheat, recommended for sowing in the southern regions, as well as Krasnodarskaya-99 varieties, which are widely planted, were obtained to study the effect of planting date, sowing, and fertilization norms on the yield and yield components of winter bread wheat varieties.

The plоt of each variant is 100 m2 (length 41.7 m, width 2.4 m), of which 50 m2 is taken into account. The number of variants was 36; the experiment was placed in 3 replications, the variantswere placed in 3 blocks. Our research was conducted in accordance with generally accepted recommendations and guidelines.

In the conditions of pale gray soils of the Kashkadarya region, taking into account the biological characteristics of winter bread wheat varieties, the proper planting date, rates, and rates of mineral fertilizers were determined. Under these conditions, when sowing bread winter wheat varieties: «Yaksart», «Bunyodkor», «Gozgon» in the early period (October 1), The sowing rate is 4.0 million per hectare. Grain seeds and mineral fertilizers N180 P108K54 kg/ha, at an acceptable period (October 20) 5.0 mln a seed rate of seeds and fertilizers N210P147K105 kg/ha, late sowing (November 10) increased the sowing rate to 6.0 million It was found that high grain yield and cost-effectiveness were achieved from winter bread varieties when seed germination and fertilizer application at N210P147K105 kg/ha rates.