Cotton: reasonable pruning according to local conditions
Conventional cotton pruning is most familiar to cotton farmers, but some are not familiar with the other two pruning methods-simplified pruning and non-pruning. The purpose of cotton pruning is to adjust nutrient distribution, control vegetative growth, promote reproductive growth, adjust plant type, determine the number of fruit branches, reduce nutrient consumption of invalid buds and promote early maturity. According to reason, the yield of cotton with conventional pruning should be higher than that of cotton with simplified pruning and no pruning, but in production practice, affected by planting density and environmental conditions, this is not entirely the case. Therefore, it is necessary to adopt appropriate pruning methods according to local conditions.
Conventional pruning
The whole process of conventional pruning is to beat leaves and branches, remove superfluous buds, pick out ears, hit the top, and hit the tip of the group, which is a method of pruning with the most labor. It is suitable for the areas where the planting density of cotton is more than 3000 plants, the planting area is small, drought can water and flood can drain, and the labor force is abundant. Using conventional pruning, the most fear is that there is no irrigation condition and drought in the middle and later stage. If there is premature senescence of cotton at this time, it is better to use non-pruning and simplified pruning.
No pruning
As the name implies, pruning-free cotton pruning simplifies the tedious process of cotton pruning to top only once. The suitable planting density of non-pruning cotton is 2000-2500 plants, where the planting area is large and the soil fertility is good, there is no irrigation condition and the labor force is insufficient. The benefit can be improved by saving labor and reducing cost. In the years when drought occurred in the middle and later stages, resulting in premature senescence of cotton, the yield of cotton without pruning was higher than that of conventional pruning. The cotton without pruning has developed root system and strong ability to resist drought and premature senescence, so the topping time should be earlier than that of cotton with conventional pruning.
Simplified pruning
Simplified pruning is to leave 2 leaf branches below the fruit branch and remove all other leaf branches. other procedures are the same as conventional pruning, which can not hit the group tip and can reduce the number of redundant buds twice. When the dominant leaf branch grows 3 secondary fruit branches, the tip of the leaf branch is knocked off. Simplified pruning is a pruning method between conventional pruning and non-pruning, which is suitable for cotton fields with medium soil fertility. By using this pruning method, cotton is resistant to both drought and waterlogging, and has a higher yield in both Rain Water's big year and dry year.
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Cotton: grab the opportunity to make soil moisture early
Although there are still one or two months to go before cotton seedlings and sowing, the current situation of continuous drought in autumn, winter and spring has posed a great threat to cotton planting this year, and according to the situation in previous years, there is little precipitation in our province from March to April. In view of the current situation, Dong Hezhong, deputy director and researcher of the Cotton Research Center of the Shandong Academy of Agricultural Sciences, suggested that cotton farmers should start and prepare early for cotton planting this year, seize the opportunity to create soil moisture according to the weather conditions, actively create soil moisture and protect seedlings against drought, and strive for one sowing of the whole seedling and early development of strong seedlings. Select
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Cotton: Proper management can reduce boll shedding
There are three main reasons for cotton bud and boll shedding: one is physiological shedding, which is also the main reason for shedding. Because of the mutual influence of meteorological conditions and nutritional conditions, it leads to metabolic imbalance in cotton plants and insufficient nutrition, resulting in physiological shedding of buds and bolls; The other is that adverse weather conditions aggravate the harm of diseases and insect pests. Cotton aphids, red spiders and other pests bite leaves, reducing the photosynthetic capacity of leaves, resulting in malnutrition of buds and bolls, increasing shedding, excessive spraying, high concentration of liquid medicine, short spraying time interval and other phytotoxicity, which will also increase.
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