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1, timely sowing, cultivation of strong seedlings. To obtain high yields in cotton sparse planting, it is imperative to develop the individual's potential for yield increase and strive for more bells per plant. The sowing time is scheduled to be in early April, 7-10 days ahead of previous years, and the flowering period is 5 days ahead of schedule. It is more flowering and strives for more effective buds and won time. A 7-centimetre-long and 10-centimeter scorpion was used for the nutrition bowl to strengthen seedbed management and early seedlings, avoiding the phenomenon of seedling squeezing caused by long seedling seedlings. When transplanted, the seedlings were 21 cm high and 4.2 true leaves to meet the requirements for strong seedlings.
2, apply enough base fertilizer to promote premature hair. The early and stable growth at seedling stage, especially the healthy growth of public branches, is the basis for the high yield of cotton sparse planting. Fertilizer application is a prerequisite for early onset. It is generally required to use 2,500 kg of high-quality farmyard fertilizer per acre, and 50 kg of nitrogen, phosphorus and potassium ternary compound fertilizer. When transplanting, use the diluted manure water first to pour the cave to ensure the quality of transplanting and shorten the period of seedlings. Hua Ling Fei Mu with 20 kg of urea, and early to early flowering use.
3. Expand the row spacing, narrow the spacing between plants, and strive for even growth of cotton seedlings. Row spacing is 100 cm wide, plant spacing is 35 cm, and the transplant density is 1800 per mu. In this way, every row of cotton is in the advantage of borderline, with sufficient illumination and good ventilation. The closure period is postponed by two weeks. Even if it is closed, the degree of field shading is better than that of conventional cotton fields, and the rate of Chengling Bell is significantly increased. According to the survey, the rate of Daejeon’s arrival rate was 39.4%, an increase of 7.4 percentage points over the previous year.
4, clever to stay more than public annex peach. The high yield of cotton sparse plants is one of the key measures for the use of public branches and peaches. Each plant should have 2-3 robust public branches. According to the field survey, on average, there were 2.8 plants per plant, 7.8 plants in the public sector, 27.7% of the total number of bolls per plant, nearly one-third of the total, and the average number of bolls per mu was 41.59 million. The decrease in density caused a shortage of the total number of bells.
5, the correct use of chemical control technology. Chemical control is an effective measure to improve the plant type and regulate the conflicts between cotton populations and individuals in the field. In the cotton fields with high density (3000 or more per mu), the use of chemical control technology can effectively improve the field microclimate, while the sparsely planted cotton fields basically have no contradiction between air and light transmission, but adequate nutrition area is beneficial to Accumulation of photosynthetic material. From the perspective of production practices, 2000 was a relatively dry year, and all cotton fields did not use chemical control. In 2001, it was still a little rainy year. The cotton fields also did not use chemical control, and did not cause the shading phenomenon caused by vigorous growth of cotton seedlings. If you encounter a rainy year, you should be flexible depending on the actual situation.
6, attention. The first is to promptly knock down the public heart and the growth of the public branch is strong. The first three fruit branches on the public branch have a higher rate of ringing, and the rate of subsequent fruit branching becomes noticeably lower. When there are three fruit branches in the public branch, Timely destruction of side-hearts is conducive to nutrient concentration to play a role; secondly, the density should not be too thin. In 2000, the actual production density was 1475 plants/mu, and the total number of bolls was 41.59 million. The output was not high. After the row distance was set, Strictly control the distance between the plants and ensure that 2000 acres are planted, so that the total number of bolls per acre can be controlled between 55,000 and 60,000, which is conducive to high yield.
Cotton sparse cultivation techniques
Cotton sparse cultivation has the following characteristics: First, labor. Each mu has less nutrition than in previous years, and the transplanting speed has also been increased by 1 time, which has eased labor conflicts. The strength of pruning has been reduced, and the operation of leafing branches has been eliminated. Only the top is pressed on time, and the heart can be played at the right time; Efficient. While not affecting cotton production, the intercropping of cotton is also conducive to interplanting. Due to the 100-centimeter spacing and sufficient light between the rows, conditions are created for the use of light energy. In practice, farmers are interplanting 1 row of peanuts at 40 cm on one side of the cotton row, that is, 1 row of cotton and 1 row of peanuts, and can collect about 80 kg of peanuts per mu, which improves the benefits.