The word "steady" should be the first in the management of cotton bud stage.

At present, cotton has entered the bud stage one after another. As the saying goes, "if cotton wants high yield, the stable growth of bud stage is the foundation." According to the investigation in the countryside and the problems encountered in the technical guidance, combined with the climate characteristics and the growth trend of cotton this year, the author thinks that the management of bud stage should be carried out around the word "stable" on the basis of "simplification, labor saving, high yield and high efficiency". And measures should be flexible and suitable for seedlings. The specific points are as follows:

1. With the popularization of plastic film cotton and the use of herbicides, the number of intertillage is obviously reduced, but the necessary intertillage should be carried out. It is necessary to break the consolidation by ploughing after rain, especially after the film is uncovered in the full bud period (around June 20). In the full bud stage, the effect of cotton film uncovering first and then ploughing and soil cultivation is obvious, for example, it can promote the root system of insect-resistant cotton, improve disease resistance, prevent cotton lodging and early senescence in the later stage, and facilitate watering and drainage in case of drought.

Second, after the chemical regulation of cotton enters the bud stage, the control of cotton overgrowth and the transformation of weak seedlings into strong seedlings can be solved by chemical measures. Sowing in the middle of April and emergence in early May this year, due to the high temperature and mild seedling disease after emergence, cotton grew vigorously and showed high-footed seedlings in the field. For this kind of cotton, chemical control can be carried out by spraying Jiaan in management, and the dosage is 0.3g / mu in the early budding stage and 0.5g / mu after the budding period, in order to realize the stable growth of cotton. Cotton with delayed sowing time and weak growth can be sprayed with foliar fertilizer containing "amino acids" such as Kunyuan 588 to promote the healthy and stable growth of cotton seedlings through supplementary nutrition.

Third, coordinate fertilizer and water for cotton with late sowing and weak growth this year, it is necessary to apply seedling fertilizer early, but the amount must be small, and the amount of urea per mu should not exceed 5 kg. After entering the full bud stage, cotton should be watered flexibly according to the situation in order to build a high-yield shelf in case of drought. There are two signs that cotton needs to be watered at full bud stage: one is that the upper part of the cotton plant wilts around noon and does not recover by 4 o'clock in the afternoon; the second is that the growth point of the cotton plant is flush with the second and third unfolding leaves or has been prominent. If short-term rain is forecast, fertile cotton fields should know that even if the cotton leaves wilt for a short time at noon, they should not encounter rain after watering. At the same time, attention should be paid to watering at bud stage, and timely ploughing should be done to preserve soil moisture after watering.

4. If the density of flexible pruning cotton field is 3000m / mu, 2m ~ 3 leaf branches can be retained, and all leaf branches can be retained if the density is less than 3000 trees. Retaining leaf branches can not only simplify cotton pruning, but also divert the nutrients absorbed by roots through leaf branches, so as to achieve stable growth. After retaining the leaf branch, the tip of the leaf branch should be finished before July 5, and the topping time of the main stem can be carried out according to the routine.

Fifth, pest control in order to reduce the number of drug use and improve the control effect, it is necessary to scientifically select pesticides and mix them, and focus on the prevention and control of blind Toona sinensis, as well as cotton aphids, cotton bollworm and red spiders. If you choose malathion + acetamiprid + methylaminoavermectin benzoate, you can also directly use compound agents such as cyanoamyl marathon or bugs westerly, etc. The control index of the blind Toona sinensis is that the rate of new damaged plants in the field is 3% and 5%, and the number of 100 insects is up to 3%. The activity of the blind Toona sinensis has the habit of avoiding strong light and weakening light, so spraying can be carried out all day, and sunny days should be carried out before 9: 00 a.m. and after 5: 00 p.m.