Effects of Sowing Date and Density on Agronomic Characters and Yield of Early-maturing Cotton Line Han 901

Using early-maturing cotton line Han 901 as material,agronomic characters and yield were studied under different sowing dates(May 5,May 10,May 15) and densities(7.5×104,9.0×104,10.5×104 plants/hm2)by non-covering mulch in late spring sowing time.The results indicated that cotton branch and bell number under early sowing and low planting density were more than the other treatments,and under the sowing date and density of May 15 and 7.5×104 plants/hm2 they reached the highest.The total number of the bell and yield of pre-frost seed cotton and seed cotton reached maximum in the treatment of sowing date and density May 5 and 9.0×104 plants/hm2.The yield of seed cotton and lint cotton had no significantly decreased by delaying sowing date and increasing density to 10.5×104 plants/hm2.Sowing date and planting density had little impact on boll weight and lint.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.The planting patterns can make cotton wadding stages to avoid the rainy season,reduce bad bell,obtain larger yield,save manpower and investment,increase cotton net benefits.