Strengthening foliar fertilization to improve the boll rate of cotton
The ripening of summer crops in Haimen City has been delayed due to the influence of climate this year, and it has been in a state of drought since the summer harvest, and it did not rain heavily for several days until mid-July. The weather conditions before drought and rain are very disadvantageous to the living and growing plants that have been postponed transplanting cotton, and the growth process is about 10 days later than usual. In order to improve the rate of bud formation and boll formation rate in the later stage of cotton, it is suggested that foliar fertilizer spraying should be used to strengthen fertilization management in the later stage.
1. Grasp the rhythm of fertilizer in combination with pest control. It is not necessary to apply fertilizer for every pest control. Different types of nutrients such as nitrogen, phosphorus, potassium and trace elements should be applied alternately. The same nutrient should be sprayed once every 7-10 days, and different nutrients should be sprayed every 3-5 days. Such as the first time with nitrogen fertilizer, the second time with phosphorus and potassium fertilizer, the third time with trace element foliar fertilizer and so on.
2. Select the varieties to ensure the coordination of nutrients. Urea is an ideal nitrogen fertilizer for foliar spraying. 0.5% urea solution is sprayed to the foliar dripping water in the later stage of cotton growth. Potassium dihydrogen phosphate is suitable for phosphorus and potassium fertilizer with a concentration of 0.2%. Trace element foliar fertilizer can effectively reduce the symptoms of element deficiency in the upper leaves and improve the boll setting rate. In addition, humic acid liquid fertilizer can promote root system development and plant health, enhance photosynthesis, regulate plant physiological function, promote plant growth and dry matter accumulation, so as to increase yield and improve quality.
3. Flexible regulation to improve photosynthetic efficiency. Foliar fertilization should be flexibly controlled according to the growth and appearance of cotton. For the cotton with weak growth, it is generally given priority to nitrogen fertilizer, combined with phosphorus and potassium fertilizer; the growth is generally combined with nitrogen, phosphorus and potassium, and those with strong growth are mainly phosphorus and potassium fertilizer, combined with chemical control, adding 3 to 3.5 grams of pure methyl piperf per mu plus water spray. Trace element foliar fertilizer is suitable for all kinds of cotton fields, especially in the fields with weak growth.
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Scientific fertilization can reduce cotton bud and boll shedding.
The vegetative growth (root, stem, leaf growth) and reproductive growth (bud, boll, boll growth) of cotton are not coordinated, resulting in the imbalance of the supply, transport and distribution of photosynthates in cotton plants, which is an important reason for the shedding of cotton buds and bolls. Through comprehensive measures centered on fertilization, controlling cotton growth is an important means to reduce cotton bud and boll shedding. Practice has proved that controlling the stem and leaf growth of cotton in the early stage, setting up a high-yield shelf in the middle stage to make it grow steadily and preventing premature senescence in the later stage is an effective way to reduce the shedding of buds and bolls in the middle and lower parts. Therefore, in addition to reasonable close planting, strengthen the water
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Fertilization Technology of Cotton in Huang-Huai-Hai region
1. The main problems in Huang-Huai-Hai cotton area are generally high amount of nitrogen and phosphorus chemical fertilizer, insufficient application of organic fertilizer, large amount of base fertilizer, insufficient topdressing fertilizer, and lack of trace elements boron and zinc. two。 The principle of fertilization (1) increase the application of organic fertilizer and advocate organic-inorganic cooperation. (2) according to the conditions of soil fertility, properly adjust and reduce the amount of nitrogen and phosphorus fertilizer, apply potassium fertilizer reasonably, and pay attention to the combined application of boron and zinc. (3) nitrogen fertilizer should be applied in stages and appropriately increase the proportion of nitrogen fertilizer in the middle stage of growth. (4) Fertilizer application should be related to high yield and high quality.
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