Do you still need topdressing when cotton flowers bloom to the top?
In early August, we went to some concentrated cotton-producing areas and found that some cotton had bloomed to the top of the cotton plant, and the color of the main stem of cotton was also red to the top. The farmer asked: can this kind of cotton still be fertilized?
In the face of such questions, the specific situation should be analyzed concretely. Generally speaking, the cotton blossoms to the top in early August, and the cotton stalk is red to the top, indicating that the cotton plant itself is malnourished. Either the lack of fertilizer supply in the cotton field led to the de-fertilization of cotton, and the vegetative growth and reproductive growth were inhibited; or the fertilizer had been applied but the cotton plant had not yet absorbed it; or the early vegetative growth was too prosperous and the later appeared premature senility; or nitrogen fertilizer was applied too quickly.
Normal growth and development of cotton should be "tender in August", the stamina is very strong, concentrated on the peach peak in late July to early August. The low temperature, overcast and rain in the early stage of this year delayed the growth and development of cotton by 10 to 15 days than usual, and many heavy rains in July caused more nutrient loss in the cotton field. If the late management of the cotton with blooming to the top and stem red to the top is not strengthened, it will have a great impact on this year's cotton harvest. For this reason, we must quickly take measures to strengthen the management of cotton fields, enhance the stamina of cotton, and strive to recover the losses caused by flooding.
The effective budding period of cotton is still half a month, and the effective flowering period is more than 30 days. If we grasp the management of this period of time, we can produce more buds, bloom more, bear more peaches and bear big peaches. At present, emphasis should be placed on the application of flower and peach fertilizer. In the flower and boll stage, urea and potassium sulfate fertilizer should be applied mainly; those who have entered the peak boll setting stage should be topdressing urea, and the amount of topdressing should be determined by the growth of cotton; at the same time, urea, potassium sulfate and potassium dihydrogen phosphate solution should be sprayed outside the root.
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Topdressing of cotton at flowering and boll stage
At present, cotton fields are entering the flowering period one after another, and after that, cotton will enter the flowering and boll period of more than 50 days, which is the peak period of cotton fertilizer demand. Cotton blossoms and sets bolls continuously during the flowering and boll period of more than 50 days, and the demand for nutrients is continuous and uninterrupted, so in addition to particularly fertile soil, it must be supplemented by topdressing. Topdressing at flowering and boll stage is an important event in cotton management at flowering and boll stage. 1. Fertilizer deficient plots should increase the amount of topdressing in areas with more per capita cotton planting area, and some villages still maintain a state of low input and low output.
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The Beginning of Autumn should pay more attention to the extra-root topdressing of cotton.
Extra-root topdressing of cotton is commonly known as foliar spraying, that is, spraying fertilizer solution on the stems and leaves of cotton plants to make the stems and leaves absorb nutrients and achieve the purpose of nourishing the whole plant (including root system). It has the advantages of saving fertilizer, quick effect and not limited by soil conditions. it is an important yield-increasing measure to quickly supplement nutrients to cotton plants in the late growth stage of cotton, especially after ldquo; the Beginning of Autumn & rdquo;. Why do you say so? Many studies have shown that the nutrients absorbed by leaves can operate in the body as well as those absorbed by roots.
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