PLANT CELL BIOTECHNOLOGY AND MOLECULAR BIOLOGY

The study identified the most suitable pasture crops to be planted as repeat crops for winter wheat for the first time in the bald soils of the Kashkadarya region. Also, the study of the optimal sowing dates, fertilization standards, and irrigation regimes of winter soft wheat varieties "Zimnitsa", "Yaksart" and "Gozgan" reveals the scientific nature of the study. At the same time, under these conditions, all three varieties of winter wheat yielded relatively high grain yields (up to 66.0-75.0 ts/ha) after repeated crops - mung beans and soybeans, additional grain yield was 4.0-6.0 ts/ha compared to pure tillage, 7.0-10.0 ts/ha compared to corn variant, Varieties are sown in the optimal period, from October 1 to October 5, from 2.5 ts/ha to 6.0 ts/ha of frost compared to late sowi, Although high grain yields were obtained when grain fertilizers were applied at high rates (NPK 250:175:125 kg/ha) compared to lower standards (NPK 100:75:50 and NPK 180:20:90 kg/ha), application of high fertilizer rate increased production costs by 30-35% compared to lower standards, resulting in high standard (NPK 250:175:125 kg/ha) inefficiency, winter wheat varieties cultivated 4 times a season, 1-2-1 system (collection) -1 time in tubing, 2 times in flowering, 1 time in milk-wax maturing), seasonal irrigation with 3950 m³/ha.