Key points of cultivation techniques of Cotton Dafeng 18

Dafeng 18 is a new mid-maturing conventional cotton variety selected by Dafeng original Cotton Farm, which was approved by Jiangsu Province in 2007. The variety has a total growth period of 131days, with an average plant height of 114.1 cm, 16.4 fruit branches, 24.6 bolls per plant, 5.8g per boll seed cotton, 40.2% lint percentage of large sample, 41.3% lint percentage of small sample, 10.3g seed index, 88.2% pre-frost flower rate, resistant to Fusarium wilt and susceptible to Verticillium wilt. Participated in the provincial regional trial from 2004 to 2005, the average seed cotton yield per mu in two years was 246.7 kg, which was 13.1% higher than that of Sumian 9, and the lint yield per mu was 99.2 kg, 11.6% higher than that of Sumian 9. In the production test in 2006, the yield of seed cotton per mu was 248 kg, 11.4% higher than that of Simian 1, 12.1% higher than that of Sumian 9, 98.8 kg of lint per mu, 9.7% higher than that of Simian 1, and 8.2% higher than that of Sumian 9. It is suitable for planting in non-Verticillium dahliae areas in our province.

Key points of cultivation techniques: ⑴ is suitable for sowing. Before and after "Qingming Festival", dry seeds were selected for sowing in sunny days, and seedlings were raised in nutrition bowls. ⑵ reasonable close planting. High fertility fields planted 1500-1800 plants per mu, medium fertility fields planted about 2000 plants per mu, and low fertility fields appropriately increased planting density. Simplified cultivation planted about 1500 plants per mu, leaving 2 vegetative branches intersecting with the row, and the vegetative branches topped 10-15 days before the main stem (usually around July 20). ⑶ fertilizing scientifically. Apply sufficient organic fertilizer, combined with nitrogen, phosphorus and potassium fertilizer and micro-fertilizer, re-apply flower and boll fertilizer, and watch the seedlings apply top fertilizer. During the whole growth period, 20-25 kg of pure nitrogen, 5-8 kg of phosphorus pentoxide and 20-25 kg of potassium oxide were applied per mu. ⑷ is properly chemically controlled. The growth regulators such as thalidomide were flexibly used to promote the growth in the seedling stage and control the growth in the middle and later stage. Light control before hitting the top and heavy control after hitting the top. ⑸ controls diseases, insect pests and weeds. Timely ploughing and weeding, and according to the local plant protection department of the forecast of diseases and insect pests in the appropriate period of control.