EFFECT OF WATER ON COTTON YIELD

Abstract

The soil of the experimental field is grass-gray, medium loam according to its mechanical composition, the groundwater level is at a depth of 7-8 meters, it is an old irrigated and cultivated land, the previous crop is cotton.

Before the experiment, mobile nitrogen-9.4 mg/kg, phosphorus-24.6 mg/kg, humus-1.13 percent in the driving layer (0-30 cm) of the field, correspondingly-8.6 in the 30-50 cm layer of the soil. -12.2 mg/kg, humus-0.86 percent, and the total amount of nutrients was nitrogen-0.105 percent, phosphorus-0.130 potassium-2.26 percent.

The volumetric mass of soils in the experimental field is 1.28 g.cubic cm in the 0-70 cm layer, the limited field moisture capacity is 19.6 percent, and in the 0-100 cm layer, this indicator is 1.30 g.cubic cm, 20.0 it was found to be percent.

In the experimental field, cotton was watered in two irrigation regimes (65-65-60 and 70-70-60 percent) and mineral fertilizers were applied in two standard amounts (N-150-200, P-120-140 and K-75-100 kg/ha). was given and taken care of.

In the intensive irrigation mode (65-65-60 percent) of the experiment, the yield increased with the increase of the rate of mineral fertilizers from N-150, P-120 and K-75 kg/ha to N-200, P-140 and K-100 kg/ha 2, It was taken into account that the yield was higher by 3.1 centners in the option with 70-70-60 percent irrigation regime (option 6), which is 5 centners more. So, in the experimental field, the highest yield (36.2 tons/ha) of cotton was irrigated in the order of 2-3-1 (70-70-60 percent). It was found that high efficiency was obtained only when K-100 kg/ha.