From the beginning of cotton boll opening to the extraction of cotton, this period is referred to as the boll opening period. During this period, the main task of cotton field management is to: protect the root physiological function, extend the functional period of the leaves, keep it high in photosynthesis, and make more nutrients. Running to effective bells, focusing on promoting early maturing, preventing premature aging, can increase production and improve quality. First, to prevent the growth of autumn dry cotton to the boll opening stage, due to the close to the cessation of vegetative growth, the case of drought and water shortage, it is easy to cause premature aging of cotton, the upper young fall off, reduce the weight of the bell. In the middle and early September, when the soil in the cotton field is reduced to 60% to 55% of the field water capacity, it should be watered in time, watering should not be too large, and pay attention to pouring. Second, the foliar dressing fertilizer grows to a lower temperature in the later period, and the soil fertilization effect is not good during this period. If there is a shortage of nitrogen fertilizer, it can be sprayed with 50 to 100 times the urea solution and 75 kg per acre. If there is a shortage of phosphorus and potassium, 300~500 times of potassium dihydrogen phosphate can be sprayed and sprayed 1~2 times. Each time, 75 kg per mu. Foliar spraying should be carried out in the sunny afternoon, cloudy days can be carried out throughout the day, in order to prevent the water from evaporating quickly after the spraying concentration increases and the leaves are damaged. Third, timely trimmed by the temperature limit, generally after the beginning of autumn buds, bloom after the white dew, are invalid. In order to save nutrients and promote early maturation, ineffective buds, leggy shoots, axillary buds and empty branches should be removed in time, and the newly born young parts of the cotton plants should be removed. This not only saves nutrients, but also reduces the damage of the fourth generation of cotton bollworms. Closure of severe cotton fields, due to poor ventilation and light transmission, can eliminate some of the excess old leaves under the premise of 3 to 5 pieces of cotton leaves to maintain a cotton boll. Fourth, to grab the rotten bell cotton boiled for three or forty days, if there is continuous rain, easy to appear rotten bell. The bolls with a bell period of 40 days or more, the bell shell has turned yellow, and dark spots appear before being crushed can be plucked before being undone. The bolls soaked in a 1% ethephon solution can be dried and the boll can be obtained. Better cotton. Fifth, timely ripening to promote the cotton plant to accelerate the opening of the boll, increase the output before the frost, spraying ethephon at a suitable period, the cotton can be advanced about ten days, frost before the flowers can increase 20% to 30%. The use of ethephon must be kept in good use. Spraying prematurely will reduce cotton quality and yield; During the spraying period, the cotton bolls in the upper part of the cotton plant should grow to more than 40 days, and the average temperature should be above 20°C within 5 hours after spraying, and about 20 days from the frost. It is generally appropriate to spray on October 1~5. The spray amount is generally 150 grams per acre with 40% ethephon and evenly sprayed with 50 to 100 times of clean water. If the spraying is early, the temperature is high and the cotton plants are weak, about 100 grams per mu can be sprayed. Chewing Gum Or Gum,Chewing Gum,Sugarless Gum,Pk Chewing Gum Soar Biotech Co.,Ltd , https://www.xylitgum.com