At the beginning of mid-August, the author received a call from several farmers of cotton-planting farmers in Shangzhou Town, Zhangshu City, Jiangxi Province and Maojiagang Town, Gongsi County, Hubei Province. They said that they were all kinds of national cotton varieties, Huazamian H318. The growth is good. Each plant has 25-30 peaches, and the best is more than 30 peaches. It is only recently that the cotton leaves are a little yellow. For some reason, what measures should be taken to transform them? The author asked whether other cotton varieties also have the problem of yellowing of leaves. They said that this phenomenon is common. Recently, the author went to the field investigation of the cotton field in the villages of Xinle and Hongwei in the Donganhu Farm Bridge of Dongxihu District of Wuhan City, Hubei Province and the Dongdong Subdistrict Office of Hanchuan City, and found that the cotton leaves in the middle and lower parts were yellowing. Only the symptoms are different.
In fact, in different growth stages, the leaves of cotton may have yellowing, but the areas that occur in the middle and late stages are relatively large and account for a relatively high proportion. The reasons for the analysis are as follows: First, when cotton suffers from waterlogging, the groundwater level is too high, and the development of the root system is inhibited, the lower leaves of cotton are susceptible to yellowing; second, this year cotton enters the flowering and ringing season and has experienced more than 20 days. In the drought, the applied fertilizer is difficult to decompose, and the supply of fertilizer and water is obviously insufficient. The middle and lower leaves fade and turn yellow; the third is the disease, mainly when the yellow cotton wilt in the old cotton field occurs, the leaves also appear yellow, but different from other yellow leaves. However, there are lesions with different symptoms on the leaves, and the vascular bundles of cotton appear dark brown and yellow, respectively. Fourth, the fertilizer input is insufficient. When the total fertilization cannot meet the growth and development of cotton, it will show premature aging phenomenon. The stalk's epidermis turns red, and the flower position quickly moves up. The growing point becomes "convex" and the middle and lower leaves turn yellow. When nitrogen is insufficient, the leaf color gradually fades and the upper leaves yellow. When potassium is insufficient, from the bud stage, there will be a yellow pattern of watermelon skin in the middle and upper leaves, but the stalk color is normal, enter the flowering, the bell stage, the mesophyll of the middle and lower leaves gradually fades and turns yellow, but the veins Still maintain the green, and then the leaf color turns red, showing red-brown pores, severe scorch fall off; Fifth, the leaves are naturally old and yellow, the life cycle of cotton leaves is generally about 70 days, the more will fall off. From the current symptoms of yellowing of cotton leaves, the main contradiction is that the supply of fertilizer and water is in short supply. Therefore, based on the above analysis, when cotton leaves appear yellow, do not be helpless, and don't worry too much. If we take the correct countermeasures and start from supplementary fertilizers, we can quickly transform and strive for high yields.
In terms of recent measures, it is necessary to supplement topdressing separately. Because this year's cotton is delayed, the time for applying fertilizer may be delayed accordingly. One can see about 20 kg of urea per acre, which can be applied before the rainfall. Can also be spread after the rain, avoid excessive rainfall in the rain before rainfall, to prevent the concentration of urea when the decomposition of the penetrating burn wounds caused cotton seedlings, resulting in Jiaoye culm; 2 can be sprayed 1% of urea and 0.2% -0.3% potassium dihydrogen phosphate solution, potassium deficiency cotton field can also be sprayed with 1% or 2% potassium sulfate solution.
From the perspective of long-term fertilization measures, high-yield cotton fields should be given enough base fertilizer, quick-applied Miao Fei, stable application of bud fertilizer, Huanhua Bell Fertilizer, Pu Shi Tao Fei. Pay attention to formula fertilization and balance fertilization.
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