Now that cotton has entered flowering and opening stage, this period of time is also called the flowering and bolling period of cotton, which is the key period for cotton management. In the management measures should be taken to promote the initial flowering, control combination, after the flowering period to promote the main increase in the knot bells, reduce shedding. Recently, the author went to interviews in major cotton producing counties, Xiajin and Wucheng counties in Shandong Province and found that there are still many misunderstandings in the management of some cotton farmers. The management methods still need to be further improved. Now the key management points are written out. Farmer reference. First, the scientific use of flower bell fertilizer, re-appropriate cover fertilizer cotton into the flower boll period, stems and leaves have reached the maximum growth, while a large number of buds, flowering bell, accumulated dry matter up, the absorption of nutrients reached At this peak, we need to re-apply flower and bell fertilizer and apply top dressing fertilizer. The fertilizer requirement of cotton requires 14-15 kg of potash fertilizer, 13.9 kg of nitrogen fertilizer, and 5-6 kg of phosphate fertilizer per 100 kg of lint cotton, followed by a small amount of trace elements such as boron, zinc, and iron. However, in the survey, it was found that farmers generally use potash deficiency, and some farmers use basic fertilizer with diammonium phosphate. When topdressing cotton, they still use diammonium phosphate. Phosphorus diammonium phosphate, nitrogen, potassium is not included, so used in cotton tend to cause early soil compaction, medium-term prosperous, late aging. The correct way to use fertilizer is to use 25-30 kg of NPK fertilizer and 40-50 kg of bio-organic fertilizer per mu as base fertilizer. If no base fertilizer is used in the earlier period, the flower bell should be used to catch the flower bell fertilizer. Available “no-tillage†per mu. "Fertilizer" (high nitrogen and high potassium type) 20-25 kg; at the same time foliar spraying "high-energy red potassium" foliar fertilizer 800 times, the potassium supplement to cotton to prevent premature aging has obvious effect. Second, scientific control, timely top control in order to control the growth of cotton, increase the rate of bell, when the cotton grows to about 40 cm, before and after the flowering of cotton selection of high concentrations of natural brassin "Shu-feng 481" foliar spray, Generally, 10 ml of “Shuofeng 481†is added to 15 kg of water, which can play an important role. The main ingredient of "Shufeng 481" is natural brassinolide, which has the function of bidirectional regulation. Use 5 ml of "Shengfeng 481" in 15 kg of water in seedling stage to promote growth and deep rooted leaves; when before and after flowering, use " Shuofeng 481†adds 10 ml per 15 kg of water, which in turn can control Wang’s role. At present, some cotton farmers control the growth of cotton with bacterin and dilute amines. Due to inappropriate dosages, especially when used in excess, they often lead to excessive control, causing aging of cotton leaves and premature aging of cotton, which seriously affect cotton yield and quality. In the management of cotton, we must also master the time for topping. Topping causes premature axillary buds and fruit branches that are too long, affecting ventilation and light transmission. It also limits the weight of fruit branches and fruit twigs, and reduces the effective production of the bolls. In the growing season, when the top is too late, the effect of adjusting the nutrient distribution will not be achieved. It should be determined according to the growing trend of the cotton and the frost period. The so-called “time to time branches and branches to unequal hoursâ€. 3. Drought is even and timely. Drought prevention and drainage The cotton must be watered in time for drought during the flowering and bolling period to adjust fertilizer with water and promote the decomposition of fertilizers and the absorption of nutrients by roots. Generally, the cotton fields in the north of China are in the rainy season from July to August. Larger changes often occur during the stage of drought, watering in time, in order to achieve high yields. Watering cotton during the boll period will depend on how to look at the land, see the land, and look at the cotton. If there is excessive rainfall, the water in the cotton fields will easily cause the bolls to fall off and can easily cause rotten bells. Therefore, it is necessary to drain water in time so as to prevent the flood disaster from reducing production. 4 Ply Face Mask,4 Ply Surgical Mask,4 Ply Medical Mask,4 Ply Disposable Mask Guangzhou Aikangli Medical Technology Co., Ltd. , https://www.aikanli.com