Author: Jumanov, D.T.; Ubaydullayeva, Sh.H.; Tojiyeva, S.O.

Annotation: The soil of the experimental field is grass-gray, medium loam according to its mechanical composition, the groundwater level is 7-8 meters deep, it is a land that has been irrigated and cultivated for a long time. 'predecessor crop cotton. Before the experiment, mobile nitrogen-9.4 mg/kg, phosphorus-24.6 mg/kg, humus-1.13 percent in the tillage layer (0-30 cm) of the field, correspondingly-8 in the 30-50 cm layer of the soil ,6-12.2 mg/kg, humus-0.86 percent and total amount of nutrients was nitrogen-0.105 percent, phosphorus-0.130 potassium-2.26 percent. The volumetric mass of the soil in the experimental field is 1.28 g.cubic cm in the 0-70 cm layer, the moisture content of the limited field is 19.6 percent, and in the 0-100 cm layer, this indicator is correspondingly 1.30 g.cubic cm .cm, found to be 20.0 percent. In the experimental field, cotton was irrigated in two irrigation regimes (65-65-60 and 70-70-60 percent) and mineral fertilizers in two standard amounts (N-150-200, P-120-140 and K-75-100 kg/ha) were given and cared for based on the recommendation. In the intensive irrigation regime of the experiment (65-65-60 percent), the rate of mineral fertilizers was increased from N-150, P-120 and K-75 kg/ha to N-200, P-140 and K - with an increase of 100 kg/ha, the yield will increase by 2.5 centners, irrigation regime against the background of fertilizers In the 70-70-60 percent option (option 6), it was taken into account that the yield was higher by 3.1 centners. So, in the experimental field, the highest yield (36.2 s/ha) of cotton was irrigated in the order of 2-3-1 (70-70-60 percent) and the rate of mineral fertilizers was It was found that high efficiency was obtained only when: N-200, P-140 and K-100 kg/ha were used for the Zarafshan variety.

Keywords: Fertilization ratio, irrigation regime, bush thickness, productivity, quality, limited field moisture capacity, moisture capacity, gross, total, mobile, nitrogen, phosphorus potassium, humus, economic efficiency, profitability.

Pages in journal: 435 - 439