Lu h28 (cotton)

1. Selection and approval unit

Lu H28 is a hybrid of upland cotton varieties (lines) with 92188 and 42-1 lines as parents in Shandong Cotton Research Center. It performed well in the Shandong hybrid cotton regional test from 1993 to 1994, and was approved and named by the crop Variety approval Committee of Shandong Province in 1995.

two。 Main characteristics

(1) yield level

He participated in the Shandong hybrid cotton regional test from 1993 to 1994, and the average pre-frost lint was 885kg / ha at 8 o'clock in two years, which increased by 22.7% over the control Zhongmiansuo 12, ranking first among the tested varieties. Among them, the average pre-frost lint was 718.50 kg / ha in 1993 and 1050 kg / ha in 1994, which was 14.3% and 28.9% higher than that of Zhongmiansuo 12, respectively. In 1995, Yutai 3-1 type wheat and cotton spring cover was 0.4 ha, which was tested and accepted by experts. The average yield per unit area was @ # @ 245kg / ha, and the per unit yield of lint was 2254.5 kg / ha.

(2) the fiber quality 2.5% span length is 29.5mm, and the specific strength 21.0cN tex-1 micronaire value is 3.9mm.

(3) the index of Fusarium wilt resistance was 6.91 and that of Verticillium wilt was 19.46.

(4) Fertility characteristics

The whole growth period of Lu H28 is 132.2 days, and the pre-frost flowering rate is 85.3%. It is a new mid-ripening hybrid cotton variety, with a plant height of 100cm and 11.8 fruit branches per plant. The fruit branch is slightly longer, the leaf is medium size, and the leaf color is slightly darker. The cotton boll is oval, the boll weight is 5.8 grams, the lint percentage is 38.8%, and the seed refers to 10.9 grams.

3. Suitable area

The spring planting of wheat and cotton in the middle and south of the Yellow River basin can also achieve high yield by taking early measures such as plastic film mulching, seedling raising and transplanting.

4. Key points of cultivation techniques

(1) Scientific fertilization

Lu H28 hybrid is resistant to fertilizer and water and has great potential to increase yield. Generally, 45-60 tons of high-quality organic fertilizer, 600 kg of cake fertilizer, 300 kg of potassium sulfate, 15-20 kg of zinc sulfate and 15-20 kg of borax are applied per hectare. Light application of seedling fertilizer, heavy application of flower and boll fertilizer and top fertilizer, give full play to the characteristics of strong boll setting of this variety, so that the top of autumn peach does not mature prematurely. Combined with pest control, 0.3% potassium dihydrogen phosphate, Ainong, Lufeng 95, photosynthetic micro-fertilizer and other plant growth regulators were sprayed.

(2) reasonable close planting

Lu H28 has strong heterosis, loose and tall plant shape, planting density of 3.0 ~ 37500 plants per hectare, row spacing of 90 ~ 100cm, transplanting of seedlings in nutrient bowl or plastic film sowing, seed 7.5 ~ 15kg / ha.

(3) full-process tuning

During the cotton growth period, according to the weather, the cotton plant should be used flexibly for 3 times according to the principle of light weight before and after heavy growth.

(4) Scientific pest control

Do a good job in forecasting, grasp the control period and control indicators, select pesticides scientifically, use alternately and alternately, improve the quality of control, popularize the methods of heart dripping, stem coating, spraying, concealed application, mobile equipment fog and ultra-low dose new technology, reduce pollution, protect natural enemies, and delay the development of drug resistance of cotton bollworm.

(5) to master the seed production technology and ensure the seed quality.

The main results are as follows: 1) seed production should be made in cotton fields with flat terrain, fertile soil, good drainage and irrigation conditions and far away from villages and forests.

2) both reciprocal cross and reciprocal cross of Lu H28 hybrid could achieve the same effect of increasing yield, the ratio of parents to plant was 1: (5 / 6) in orthogonal or reciprocal cross production, and 1:1 or concentrated planting in pieces of parents was used in simultaneous seed production of reciprocal cross. The best planting mode was size, and the suitable density was 30000 plants per hectare.

3) seed production time. All the flowers blooming in the Yellow River basin from July 5 to August 20 are pollinated, and all the buds before and after the flower buds should be removed, and seed production should be carried out with 45 seed producers per hectare.

4) male pollination. The castration was carried out at 2: 7 p.m., and the buds with Corolla exposed bracts were selected to castrate the buds that could open the next morning. The best time for pollination is 8: 10 a.m. on the second day of castration, which ends before 12:00.

5) timely harvest. In order to ensure the boll formation rate and normal development and maturity of hybrid bolls, we should pay attention to the prevention and control of diseases and insect pests, strengthen various field management, do a good job of pruning and removing the edge of fruit branches during hybridization, reduce hybrid boll shedding and mechanical damage, and collect the mother's line first, and then the father's line. To separate collection, drying, rolling, storage, to ensure purity.