Effects of sowing dates on yield and nutrient utilization efficiency of short-season cotton varieties

The field experiment was conducted to study seed cotton,lint yield and nutrient utilization efficiency of 4 short-season cotton varieties on the condition of sowing earlier than ordinary( April 25) with planting density of 52 500 plants per ha and sowing ordinarily( May 15) with planting density of 75 000 plants per ha. The 4 test short-season cotton varieties were CRI 50,SCRC 35,Han 686,Yuzaomian 9110. The results indicated that earlier sowing had no influence on growth stage of short-season cotton varieties and seed cotton yield,lint yield,lint percentage of short-season cotton varieties on the condition of sowing earlier were higher than those of sowing ordinarily respectively,while biological yield,nitrogen,phosphorus,potassium uptake quantities per 100 kilograms seed cotton yield and per 100 kilograms lint yield on the condition of sowing earlier were fewer than those of sowing ordinarily respectively,and nitrogen,phosphorus,potassium utilization efficiencies on the condition of sowing earlier were higher than those of sowing ordinarily respectively. In the field experiment,nitrogen,phosphorus,potassium utilization efficiencies were improved by sowing earlier than ordinary,thus seed cotton yield and lint yield were enhanced.