Effects of Planting Density on Growth Trends and Yields of Early-maturing Cotton in the Late Spring Sowing Mode

Using early-maturing cotton HS901 as material,growth trends and yields of cotton in different periods were studied under four planting densities(6.0 × 104,7.5 × 104,9.0 × 104,10.5 × 104 plants/hm2) in the late spring sowing mode.The results indicated that the maximum yield was 4 867.5 kg/hm2,when the planting density was 7.5 × 104 plants/hm2,and the yield of which was higher than others,the total boll number was larger,boll weight was not significantly reduced.Thus,a new cropping patterns was proposed in Huang-Huai Region,planting early maturing cotton varieties by appropriately increasing planting density in late spring sowing time,which could reduce the number of boll rot,obtain higher yield,save the labor and investment,then increase the net income of the farmers.The suitable planting density was 7.5 × 104 plants/hm2.