Jiumian No.2 (Cotton)

Jiumian No. 2 is a new cotton variety selected from the cotton experimental station of Jiuquan Agricultural Research Institute in Gansu Province, which is a strain 77-118 with early maturity, high yield and high lint percentage, crossed with disease-resistant and late-maturing variety Zhongmiansuo 16, and bred directionally through pedigree selection. It was approved and named by Gansu Provincial crop Variety approval Committee in 2001. This variety is suitable for planting in the cotton area of Hexi Corridor in Gansu Province, Ejina Banner in Inner Mongolia and Ningxia.

1 the main characteristics of this variety are very precocious upland cotton, the whole growth period is 138 days, and the ratio of pre-frost flowers is 83.8%. Fast and neat seedling emergence, rapid production and development in the early stage, strong growth in the middle stage, plant tube type, compact plant tube type, plant height 58.0-64.9 cm, fruit branch I-II type, the node position of the first fruit branch is 3.5, and the number of fruit branch layers per plant is 8. The leaf is medium to small, the back of the leaf is fluffy, the leaf color is light green, the leaf shape is usually palmately 3-5-lobed, the notch is shallow, and the wrinkle is obvious. The number of bolls per plant is 5.1-8.2, the inner bolls are many and concentrated, the bolls are large, round, pointed, 4-5, the average boll weight before frost is 6.0g, the boll shell is thin, the boll is smooth, the boll content is strong, the cotton wool is white and mercerized, and it is easy to pick. The grain is white, pear-shaped, and the seed finger is 12.3 grams. The sub-skin cotton samples from each test site were determined by the Cotton Fiber testing Center of the Ministry of Agriculture, the results showed that 2.5% span 28.9mm, length uniformity 50.4%, fracture specific strength 19.6cN/tex, micronaire value 3.8. The results showed that the average incidence of Fusarium wilt was 5.4%, and the disease index was 2.1, which was 74.1 and 63.4 percentage points lower than the susceptible control Xinluzao 7, respectively. It was 0.9 and 0.3 percentage points higher than the resistant control Jiumian 1, and there was no significant difference between Jiumian 1 and Jiumian 1. It was a variety with high Fusarium wilt resistance.

2 yield performance participated in the regional trial of new cotton varieties (lines) in Gansu Province from 1999 to 2000, with an average yield of 4983 kg per hectare of seed cotton and 1911 kg of lint per hectare in two years, 21.1% and 24.4% higher than the control variety Xinluzao 7, respectively. the average yield of seed and lint ranked first among the 9 varieties tested. And the output was stable, and the yield was increased in 5 of the 6 pilot sites in the two years earlier than that of the control Xinlu on the 7th, and only a little reduced. He participated in production experiments and demonstrations from 2000 to 2001, with an average yield of 5436 kg of seed cotton per hectare and 2136 kg of lint per hectare, an increase of 4.6% and 11.3% respectively over the control Xinluzao 7.

(3) the key points of cultivation are suitable for early sowing and evenly sowing seedlings in the cotton area of Hexi Corridor in Gansu Province, it is suitable to sow the whole seedling in the first and middle of April, in order to sow the whole seedling, fight for early seedling, raise strong seedling, keep 165000-180000 seedlings per hectare.

Balanced fertilization and scientific irrigation on the basis of conventional basic application of high quality fertilizer, early and re-application of flower and boll fertilizer and topping fertilizer should be applied to prevent cotton plants from getting rid of fertilizer in the later stage, resulting in a reduction in yield, and foliar fertilizer should be sprayed in time according to the cotton's appearance. The appropriate N:P:K for the whole growth period is 1RV 0.67 / 0.3. Head water was irrigated before and after flowering, once at intervals of 15-25 days, and 3-4 times during the whole growth period.

Pruning in time, scientific regulation and control of the first fruit branch when it is obvious, topping in the first and middle of July, leaving 8-10 layers of fruit branch. It is necessary to control scientifically, combine regulation and control, grasp the principle of "early control, light control and diligent control", and use plant growth regulators (buds, dwarfs, etc.) to regulate and control 3-4 times at bud stage and boll stage.

Prevention is the main, combined with prevention and control of cotton aphids, red spiders, cotton bollworm and other pests, according to their occurrence law, do a good prediction, early detection, early control. Carry out the principle of giving priority to prevention, combination of prevention and control, comprehensive prevention and control, avoid or postpone chemical pesticide spray in the whole field as far as possible, adopt concealed application and other methods to protect and utilize natural enemies, reduce control costs and improve production efficiency.