In recent days, some farmer households have reported that there is a strange phenomenon in the production of cotton: The growth of the large bells and early-stage cotton bolls in the lower part of the bolls has not yet been demonstrated, but the tender bells in the middle and upper part have cracked ahead of time, and some of the cracks appear after the cracking. The Wuqiao County Bureau of Agriculture Immediately organize technical personnel to find out the reason in the field. First, field performance Early sowing, the upper 1 to 3 fruit branches due to rain or pests and diseases without the bells or premature tunics with only a few bells, the number of bolls in the upper part of the cracking is relatively more, that is, from the bottom of the number of 7 to 8 fruit branches outside The inner bells of bells and 9 to 10 fruit branches are between 2.5 and 3.1 cm in diameter. The surface of the shell shrinks and thins and cracks, turning brown from the top of the shell to more than two thirds of the area, and the yellow leaves are yellow. Some cracked bells were infested by rainwater and were infested by germs. There were rotten bells. The average number of cracked bolls per plant in this type of cotton field was 2 to 3, and 4 to 5 were more; the average number of cotton bolls per plant was 0.5 to 0.8. Late cotton field cracking cotton boll least. Second, the cause analysis 1. It is related to the sowing date. Early sowing of cotton fields, due to the development of early and late June to early July by the continuous high temperature and light effects, up to 2 to 3 or even more P. fructus, so that vigorous reproductive growth, and relatively weak vegetative growth. From late July to early August, the average temperature is 1.3°C~1.5°C lower than the same period of the calendar year, and even more rainy weather (cotton is a hi-temperature and hi-light crop, requiring a higher accumulated temperature and stronger light), insufficient light for continuous rainy days, Photosynthetic products decreased. The growth of fiber and seeds in the middle and upper tender bells was normal, but the shells had less synthetic nutrition, especially the hydrophilic substances such as soluble carbohydrates in the full boll shells. The growth rate lags behind and the shells are dehydrated and cracked in advance. 2. Variety factors. There are differences in the degree of cracking among cotton field varieties. Shells with thin and bell-intensive varieties, such as 7886, are more severe than shells with thick shells and low boll weight. 3. There are differences in the degree of cracking caused by different spraying times and application methods. Sites that spray more often in the field are significantly heavier than plots with less spraying. The analysis is closely related to spraying methods. Farmers are accustomed to compounding several kinds of medicines, even spraying some fertilizers and foliar fertilizers. The method or procedure for dispensing medicines is not correct, so that the upper middle bolls are covered with medicines, fertilizers, drugs, and fertilizers. Accumulated on the surface of the cotton boll shell, the tender peach in the middle and upper part is in a period of rapid growth. On one hand, the accumulation of drug fertilizer affects photosynthesis, on the other hand, it accelerates the dehydration and aging of the shell surface and promotes early cracking. 4. Climate factors. The climatic factor is the most important factor causing the cracking of cotton bolls. From late July to early August, there were more than a dozen rainy days, and the temperature was 1.3°C to 1.5°C lower than the same period of previous years. The light was severely deficient, photosynthetic and photosynthetic products decreased, resulting in unbalanced development inside and outside the bolls and normal internal material accumulation. The accumulation of dry matter in the shell is inhibited, and the growth of the bell shell slows or stops growing, resulting in a disproportionate proportion, which results in cracking of the cotton boll. 5. It is related to the effectiveness of locust control. Due to the serious occurrence of this year's Fuxi, for all kinds of reasons, because of the poor control of Fuxi, due to the weakening of the plant's vegetative growth, the cracking bolls are more than the cotton field where the locust control is effective. Third, prevention and remedial measures 1. Appropriate late broadcast. According to the local climate characteristics combined with previous planting experience, timely sowing to ensure that the whole seedling sowing, reduce the incidence of seedling disease, promote seedlings healthy growth, improve plant resistance to disease, resistance, reduce the number of Fushua, to ensure the proportion of three peach, To achieve a balanced increase in production. 2. Select varieties with strong resistance and do a good job of planting varieties. For old cotton fields and severely diseased plots that have been planted for many years, the varieties with strong growth and rapid growth during the early stage of planting are selected to prevent the occurrence of early reproductive growth due to thin seedlings. Farmers with large cotton planting area can choose 2 to 3 varieties to plant and prevent the losses caused by extreme abnormal climate effects. 3. Timely control of pests and diseases and scientific remedies. Important pests and diseases in cotton fields include spider mites, aphids, blind stink bugs, and cotton bollworms, which should be closely monitored. When the occurrence of prevention and control targets is timely, prevention and control can not be delayed to prevent serious damage to the cotton plant caused by delaying the critical period of pest control, resulting in premature aging of the cotton plant. Reagents should pay attention to the following points: 1 combination of good and effective treatment can be used alone to control a variety of pests; 2 prepare a dispensing bucket, the need to reconstitute a single dose or fertilizer according to the use of the concentration first in the barrel Turn on the reserve; 3 Add half a bucket of water to the sprayer first, then add the diluted liquid or fertilizer, and spray it with water after repeated stirring; 4 The medicine needs to be used immediately. 4. Remove the mulch film in time, do a good job of cultivating the cultivator, promote the roots down, and improve the plant's drought resistance, disease resistance, and resistance to stress. 5. Properly expand the spacing, preserve the leaves, increase the vegetative area, and improve resistance. According to the test, more than one madness in cotton is more than a single root. Only with a large number of roots and deep roots can we achieve deep-rooted, leafy, disease-resistant and anti-aging purposes. According to investigations, there has been no occurrence of premature cracking of bolls in this year's 80- to 100-cm line spacing planted cotton fields. 6. Cracking cotton bolls. At present, as long as there is no continuous rainy weather, the cotton bolls can be removed temporarily, and the nutrition on the leaves and fruit branches can still be transmitted into the cotton boll through the bell, which is beneficial to increase the boll weight appropriately. 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