A New Cotton Variety-Baimian 1

Baimian 1 is a mid-mature cotton variety suitable for spring sowing with high yield, high quality and disease and insect resistance. The growth period is 136-140 days. Fast emergence, neat, robust, low temperature tolerance, fast growth in seedling stage, large cotyledons and green stems. The leaf is medium to large, the notch is shallow, the hairs are less, the light transmittance is medium, the whole leaf type, the leaf color is dark green. The average plant height is 103cm, the plant tower shape is loose, the first fruit node is 7.5 nodes, the fruit branch angle is medium, the stem is thick, tough, resistant to lodging, and the stem color is slightly red. The bud is fast and concentrated, and the pistil and stamen are beige. The average number of fruit branches and bolls per plant were 12.6 and 16.9, respectively. The bolls were strong, the bolls were oval, the single boll weight was 5.38g, and the cottonseed was 11.8g/100. The lint percentage is 42%, which is 2.85% higher than that of Zhongmian 41. The bell shell is thin, smooth and easy to pick. The average flowering rate before frost is 89.45%, which is 2.0% higher than that of Zhongmian 41. The rate of sterile seeds is 9.39%, which is 0.17% less than that of Zhongmian 41. The cotton fiber quality tested by the Cotton quality Supervision, Inspection and Test Center of the Ministry of Agriculture reached the national breeding target of the Tenth five-year Plan. By the Cotton Research Institute of Chinese Academy of Agricultural Sciences, the disease index of Fusarium wilt was 4.72, that of Verticillium wilt was 23.41, and that of cotton bollworm. The variety showed the characteristics of early maturity, no premature senescence, stamina, high quality, high yield, strong resistance to stress, good resistance to diseases and insect pests, high resistance to wilt and Verticillium wilt. It is an excellent new variety with development value.

The yield is high. According to the average results of the 24-point test in two years, the lint yield of Baimian 1 and pre-frost lint increased by 14.42% and 16.33% respectively compared with the control Zhongmian 41, reaching a very significant level. In the regional trial of spring cotton variety group in 2002, the yields of seed cotton, lint and pre-frost lint were 245.62kg, 103.72kg and 95.21kg, which increased by 6.97%, 12.17% and 14.2%, respectively, compared with the control variety Zhongmian 41. In 2003, the yields of seed cotton, lint and pre-frost lint were 142.8kg, 56.2kg and 48.9kg, which were 11.7%, 15.8% and 21.8% higher than the control variety Zhongmian 41, respectively. The average yields of seed cotton, lint and pre-frost lint in two years were 194.21kg, 79.96kg and 72.06kg, which were 9.34%, 14.24% and 18.0% higher than those of the control variety Zhongmian 41, respectively. Taking part in the production experiment in 2003, the yield of seed cotton, lint cotton and pre-frost lint cotton 130.9kg, 52.0kg and 43.6kg increased by 9.1%, 14.8% and 13.0% respectively compared with the control variety Zhongmian 41.

Key points of cultivation techniques 1. Planting mode: according to the climate characteristics, variety characteristics and planting habits in Huang-Huai cotton area, Baimian 1 is suitable for spring sowing, wheat-cotton interplanting, plastic film mulching or seedling transplanting. two。 Sow seeds at the right time and firmly grasp the whole seedling. Direct seeding in spring or plastic film mulching requires sowing from April 15 to 20, while seedling raising in nutrition bowl requires sowing in early April and transplanting at the end of April and the beginning of May. Carefully select and dry seeds before sowing, improve the post-maturity of seeds, and strive to sow the whole seedling. 3. Reasonable close planting to promote the rapid growth of seedlings. The suitable density of Baimian 1 is 2500000 plants per mu. After wheat, it is necessary to kill stubble in time and water early to promote the growth of cotton seedlings and ensure the rapid development of cotton seedlings. 4. Strengthen the management of water and fertilizer and increase the application of organic fertilizer and phosphorus and potassium fertilizer. Because Baimian 1 has the characteristics of tall plant and strong boll setting, it is particularly important to increase the application of organic fertilizer and phosphorus and potassium fertilizer, and it is necessary to apply fertilizer early at flowering and boll stage to increase boll weight. 5. Attention should be paid to the control of the fourth generation cotton bollworm and cotton pests except Lepidoptera in cotton field. In the early stage, attention should be paid to the control of aphids, red spiders and thrips; in the middle stage, attention should be paid to the control of night moth pests and shell pests; in the later stage, attention should be paid to the control of the fourth generation cotton bollworm.

According to the examination and approval opinion of the Variety Association, "Baimian 1" conforms to the cotton variety approval standard of Henan Province and was examined and approved by the eighth meeting of the Fifth crop Variety approval Committee of Henan Province. It is suitable to be planted in Henan and Huang-Huai cotton areas.