Jimian 25 (cotton)

Jimian 25 is a new high-quality and disease-resistant mid-early maturing upland cotton variety bred by Cotton Research Institute of Hebei Academy of Agricultural and Forestry Sciences through interspecific hybridization, backcross and double crossing of upland cotton, Asian cotton and wild cotton. The parent is [Jimian 8 × (4086 × Shiser)] × (Jim182 × Zhonglu 85-2-1). Cotton Research Institute, Hebei Academy of Agricultural and Forestry Sciences

The growth period of this variety is about 125 days. The plant height is 88 cm, the plant type is moderate, the seedling emergence is fast and neat, the growth is strong in the middle and later stage, the leaf size is medium, the leaf wrinkle, the leaf color is dark, the leaf function is good. The boll is large, oval, blunt bell tip, thin bell shell, boll weight 5.2-5.93 grams, strong boll-forming ability. The lint percentage is 41%, the seed refers to about 10 grams, and the flower rate before frost is 89.5%. It is precocious and not senile, and it is easy to pick.

Jimian 25took part in the regional test of Hebei Province from 1994 to 1995 and all increased production at 12:00 in the past two years. The average yield of lint and pre-frost lint per mu was 60.9kg and 54.5kg, respectively, 18.5% and 23.3% higher than that of Zhongzhong 12, reaching a very significant level, ranking first among the 10 varieties tested. Participated in the national regional test of cotton varieties in the Yellow River Basin from 1995 to 1996, the average lint yield per mu was 68.3 kg, an increase of 7.9% over the control Zhong 12, reaching a significant level. In 1997, he participated in the national cotton variety production test in the Yellow River Basin. Lint and pre-frost lint yielded 85.8 kg and 79.0 kg per mu, an increase of 27.5% and 30.76% respectively over control Zhong 12, ranking first among conventional varieties. In the regional test of bingtuan seed terminal in 1997, lint and pre-frost lint produced an average yield of 117.0 kg and 112.2 kg per mu, an increase of 8.4% and 10.1% respectively over control Zhong 12, which is the most prominent variety in comprehensive evaluation.

According to the test, the 2.5% span length is 29.1mm, the specific strength is 19.8g / Tex, the micronaire value is 4.5, the ring spinning strength is 114lbs, and the air spinning index is 1766 points. The comprehensive index meets the textile requirements. It was identified as a variety resistant to Fusarium wilt and tolerant to Verticillium wilt by Hebei Plant Protection Institute, with Fusarium wilt index 9.41 and Verticillium wilt index 68.82. It was identified as a variety resistant to Verticillium wilt in the Plant Protection Room of China Cotton Institute from 1995 to 1996, with an average disease index of 16.7. Jimian 25 generally showed resistance to Verticillium wilt in production. The variety has been tested in Heilonggang area for many years, and the variety has certain drought resistance and saline-alkali tolerance.

Regional and technical Jimian 25 is suitable for planting in Hebei, Henan, Shandong, * and other provinces and cities. At present, the cumulative promotion area has reached 1.2 million businessmen, creating economic benefits of 336 million yuan. It is estimated that the cumulative extension area will reach more than 8 million mu in the past two years.

Cultivation rules:

1. To ensure that the whole seedling before sowing, seed drying, soaking seeds, on the basis of sufficient basic fertilizer, irrigate Zudi Po water, sowing seeds at the right time.

two。 The density of water and fertilizer land is about 3300 plants per mu, and that of dry and thin land is about 4500 plants per mu.

3. Coordinate fertilizer and water, the variety develops rapidly, budding bolls early, on the basis of sufficient fertilizer, the first watering time can be properly advanced, combined with watering 10-15 kg urea per mu during the growth period.

4. The whole process chemical control, reasonable dosage at bud stage, 1.0 g / mu with thalidomide, 2 times at flowering and boll stage, with a general dosage of 1.5 g / mu. The cotton fields with waterlogging years or prosperous growth should be appropriately increased, and the cotton fields with weak growth in dry years should be appropriately reduced.

5. The main pests for timely control of insect pests are cotton aphid and cotton bollworm, which should be eliminated in time according to the control index.