Occurrence time and prevention of cotton fertilizer damage
Different degrees of cotton fertilizer damage occur in different cotton areas every year, and it may occur in different periods of cotton growth.
Fertilizer damage also occurs in the process of cotton transplanting, so the amount of topdressing at the seedling stage must be controlled. The first application of urea is 5-6 kg per mu, and the second is increased to about 10 kg. Before transplanting, excessive application of base fertilizer at one time will also produce fertilizer damage, such as the application of high content of multi-component compound fertilizer, only 25kg / mu can be used.
The partial application of nitrogen fertilizer at bud stage will also have a negative effect on cotton. First, it is easy to lead to the vigorous growth of cotton, especially from late June to early July, which is not only easy to cause a large number of buds and bolls to fall off, but also prone to premature senescence in the later stage of cotton; second, it is easy to cause the occurrence and harm of bugs. Therefore, in the bud stage, it is better to apply organic fertilizer, combined with appropriate amount of inorganic compound fertilizer, and 10 kilograms of potassium fertilizer.
In recent years, fertilizer damage caused by fertilization during the boll setting period is also common. Most farmers see that the weather is about to rain and immediately apply urea before the rain. As a result, when it first clears up after the rain, it is found that the leaves of several layers of fruit branches in the lower part of the cotton plant wilt. In serious cases, the whole plant will wither, causing serious losses. Therefore, cotton farmers must pay attention to the application of peach fertilizer, it is best to apply holes, or urea after the rain.
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Cotton harvest should be managed well in July and August
1. The importance of the decisive battle in July and August Cotton boll period is the longest stage in cotton growth period, and it is the most abundant period of natural resources such as light, heat and water, which is very conducive to cotton growth and development. However, there were disadvantages in this period. Not only were natural disasters such as wind, hail, drought and waterlogging frequent, but diseases and insect pests were seriously harmed. There was a saying in the agricultural proverb that "cotton is grass, good can go bad, bad can go good". Therefore, this period is the key period to seize the cotton harvest, especially this year, in the cotton growth process delayed 7 to 10 days than in previous years, seedling situation
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Eight methods of preventing Cotton from rotten Boll
1. Ditching and drainage cotton is most afraid of autumn waterlogging, the greater the humidity of the cotton field, the more serious the rotten bolls. In case of continuous rain, it is more likely to cause rotten bell. Therefore, after the heavy rain, it is necessary to timely eliminate the stagnant water in the cotton field, dry the moisture to reduce the humidity, improve the field microclimate, accelerate the cotton boll cracking, restrain the propagation and spread of the pathogen, and reduce the rotten boll. two。 In cotton fields with high pruning density and vigorous growth, after full flowering, empty fruit branches should be cut off in time, strong buds should be erased, middle and lower side tops and old leaves of main stems should be removed in stages and batches, so as to enhance ventilation and light, reduce temperature and reduce rot.
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