Lu Mianyan 21

Auditing No.: National Auditing Cotton 2005011

This breed is a new breed of conventional insect-resistant cotton that was selected by the Cotton Research Center of Shandong Academy of Agricultural Sciences. It passed the national examination and approval in April 2005. Its comprehensive traits are superior to other insect-resistant cottons, and it is a new type of insect-resistant cotton that combines disease resistance, insect resistance, disaster resistance, and high yield.

I.Characteristics: Lu Mianyan No.21 has a full growth period of 130 days. It has good emergence, early development, strong and stable growth, good permeability, resistance to rain, less teeth, easy management, flowering and ringing, and large bells. , Strong bells, thin bell shells, light bells, smooth and concentrated boils, and high pre-frost flower rates. The weight of single bobbins was 5.8 to 6.3 g, the percentage of clothes was 41.6%, and the sub-index was 11.6 g. High resistance to cotton bollworms and other lepidopteran pests, high resistance to wilt disease, resistance to verticillium wilt. The 2.5% fiber spans 30.7 mm in length, the specific strength is 21.7 cN/tex, and the micronaire value is 4.7.

II. Output Performance: In the 2003 national cotton-bearing area trial of the Yellow River Basin, the lint yield before lint production was 115.0kg per mu, which was 3.0% higher than that of the control hybrid cotton Zhongmiansuo 38. In 2004, the lint yield before the frost was 125.5kg per mu. The China Cotton Industry No. 41 increased production by 10.5%, ranking the first place. In 2005, the average yield of lint and pre-frost lint was 136.0kg and 114.4kg respectively, which was 13.0% and 14.6% higher than the control.

Third, cultivation points:

1. Planting methods: Suitable for middle-upper springtime cotton fields in the Yellow River and Yangtze River valleys, spring planting or spring planting.

2, timely sowing: 5cm ground temperature stable through 15 °C is appropriate, spring sowing in general before and after April 20 sowing. Precision sowing, sowing rate per acre is not less than 1.5kg; point seed, no less than 3 per hole, made good, and strive to broadcast all seedlings.

3. Appropriately sparsely planted: 2,200-2,800 plants per acre in Shandong, and 1,600-2,000 plants per acre in southern southern China.

4. Balanced fertilization: Reapply organic fertilizer as base fertilizer, increase phosphorus and potash fertilizer, and lay a good breeding shelf. At the end of June, the flowers should be reused, and the early flowering bell fertilizer should be used. Generally, 10 to 12.5 kilograms of urea should be topdressed, and the top dressing should be applied once again before July 20th. The urea of ​​5 to 7.5 kilograms of urea should be applied. If there are signs of de-fertilization at the late stage, the leaves should be used. Spray fertilizer. Drought should be watered in time to ensure tenderness in August.

5, science pest control: the second generation of cotton bollworm generally do not spray control, three or four generations of cotton bollworm depending on the severity of prevention 1 or 2 times.

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