The flowering and boll stage is the most flourishing period of cotton growth. This stage is gradually transformed from vegetative growth to reproductive growth. It is the peak period of life-demand fertilizer and water demand, and it is also a crucial period for determining cotton yield and quality. The management goal is “four guarantees, three increases, and two defensesâ€, that is, to protect roots, preserve leaves, protect buds, and protect bells; increase the number of bells, increase the weight, increase the number of clothes, prevent rotten bells, and prevent premature aging. The following management measures are proposed for the growth and development characteristics of flowers and bolls: First, reapply flower bell fertilizer, top dressing top dressing fertilizer For soil fertility, good sensation, cotton plants grow robust cotton fields, flowers and bell fertilizer can be a small amount of fertilizer in the flowering period or delay the topdressing, so as not to grow or overnutrition caused by falling flowers Lei, generally Mu topdressing 8 ~ 10 kg of urea and 5 ~ 10 kg of potassium sulfate or potassium chloride. Second, for the cotton field with insufficient base fertilizer, poor sensation, and weak cotton growth, early flowering and reapplying flower bell fertilizer should be applied. It is advisable to use topdressing at the early flowering stage to avoid excessive fertilization and cause premature decline of the cotton plant. Generally, 10 to 15 kg per mu are used. Urea and 5 to 10 kg of potassium sulfate or potassium chloride. Thirdly, for cotton fields with excessive fertilization and overgrowth in the early stage, the topdressing in the flower and boll stage should be postponed until the cotton plant sat between 1 and 2 bells. It is necessary to reduce the amount of nitrogen fertilizer in an appropriate amount to satisfy the large number of flowering bells on the fertilizer. Requirements, but also prevent the cotton plant leggy, to create conditions for multi-knot peach and autumn peach. The fourth is the poor soil, cotton plants have a tendency to defer from premature aging of cotton fields, to apply early, more top dressing fertilizer, cover the time of top dressing, should be carried out at the end of July early August, fertilizer should not be too late, or easy to cause Greedy late mature. In general, apply 5 to 8 kg of urea per acre for the top dressing. Top dressing is mainly applied with acupuncture points or strips, applied to the surface below 10 cm, 25 to 30 cm away from the cotton plant. According to soil strength and growth of cotton plants, combined with pest control, spraying 0.2% potassium dihydrogen phosphate + 1% urea + 0.2% borax mixed solution 2 or 3 times, and quickly replenish plant nutrition, regulate plant nutrient structure, reduce flower bell Fall off. Second, drought and watering, the case of water drainage and flowering period is the period when the cotton needs the largest amount of water. After entering the flowering and bolling period, in case of drought, the soil moisture is poor, causing a large number of budding bells to fall off, and the fruit branches spreading slowly, thereby affecting the yield. The cotton plant showed a rapid increase in the red part of the main stem, a red-green ratio of more than 3/5, dark green and leafy leaves, and wilting in the top leaves of cotton plants at noon on a sunny day, and could not be restored after 4:00 pm. These phenomena all indicate lack of water. Watering should be timely, irrigation should be a small gutter irrigation or gutter irrigation, to avoid flooding irrigation; if the precipitation is too large, it will lead to cotton plants, field closed, a large number of Lei Ling shedding, drainage should be promptly to prevent root disease and Bells fall off and rotten bells. Third, timely pruning timely pruning to regulate nutrient distribution, reduce nutrient consumption, improve the ventilation and light conditions of the cotton fields, reduce the rotten bell, promote premature, increase production and quality, has an important role. Adhere to the principle of pruning “by setting branches densely, branch by timing, branch to unequal, and time to branchâ€. One is playing the top. In the Hengshui region, the top time of the cotton field is generally controlled around July 20th. Topping out early or late is not conducive to the improvement of cotton production. If the cotton plant grows strong and its density is small, it can be postponed until the end of July topping. The latest can not be later than Liqiu; if the cotton plant grows weak and the density is high, it can be advanced to the upper and middle of July topping. The second is to hit the top. The cotton fields with good water and fertilizer conditions, strong cotton growth, or serious closure trend, can control the time and degree of closure, improve lighting conditions, reduce ineffective buds, promote early maturation, and reduce rotten bells; poor water and fertilizer conditions, cotton plant growth. Cotton fields that are weak or have no trend of closure may not be group leaders. Fine pruning of cotton fields, grouping tips should be carried out in phases. The third is to wipe buds and old leaves. High-water-fertilizer, low-density, cotton-growing strong cotton fields often have a large number of axillary buds, and axillary buds can be removed at any time by combining with the topping. For closed cotton fields, in order to improve the ventilation and light conditions of the cotton fields and reduce the occurrence of boll shedding and rotten bells, the old stems of the main stems can be destroyed in stages from the next upward direction; some axillary buds can be preserved in cotton fields with a tendency to premature aging. Fourth, the cultivator loose soil, to prevent premature failure Flowering bell is a season of high temperature and rainy season, easily lead to lack of water in the soil, reduce the ability of roots to absorb water and fertilizer, resulting in a large number of bolls fall off, therefore, the flowering period should be timely cultivating loose soil. In the flowering and bolling stage, the cotton root regenerative ability is weakened, and the arable land in the cotton field should not be deep enough. Generally, the cultivating depth is 6 to 7 centimeters to avoid excessive rooting and cause premature senescence. For the cotton crops that have an impractical trend, appropriate deep cultivators should be used to cut off part of the lateral roots. Control leggy. When the weather is dry, the soil in the cotton field must also be irrigated in time after irrigating to reduce the humidity in the field, reduce the occurrence of pests and weeds, and prevent rotten peaches. When cultivating, minimize damaged branches and bump buds. Fifth, rational control, suppression appetite should be based on precipitation and cotton growth conditions determine the appropriate timing, dosage, dosage, generally in the main stem of the first flowering daily growth of 2.5 cm, the flowering period of 3 cm daily growth will be controlled . Strongly growing and robust plant plots should use 1.0 to 1.5 grams of water for 30 kilograms of water at the beginning of the flowering period, and 2 to 3 grams of water for the flowering period and 40 to 50 kilograms of water to evenly spray the top and side of the cotton plant. Heart, such as too much late rain, the cotton field with a long trend in the top 5 to 7 days after the top, Mu with 4 to 5 grams of security; poor growth of the field should be based on the growth of the appropriate reduction in the amount of medication and the number of medication . Grasp the appropriate control of more rain, the principle of appropriate control of drought. To simplify the pruning of cotton fields can be reduced through the chemical control group tips, wipe buds and other processes. Six, timely control of pests and diseases cotton flower pests more pests, is caused by falling buds in this period the main reason. Cotton blight, verticillium wilt, red leaf blight, blind stink bug, cotton bollworm, cotton aphid, whitefly etc. occur in varying degrees and should be targeted and timely controlled. Sodium Erythorbate Fcc Grade,Sodium Erythorbate Powder,Sodium Erythorbate Food Additive,Food Grade Sodium Erythorbate SHANDONG BAISHENG BIOTECHNOLOGY COM , https://www.baishengbioproducts.com