What is the effect of spraying foliar fertilizer on cotton in the later stage?

What effect does foliar fertilizer have in cotton late stage? How to spray foliar fertilizer on cotton? Also ask experienced netizens to help introduce The planting network sorted out the role and operation methods of foliar fertilizer spraying in the process of cotton planting. The following are listed in detail for netizens 'reference. 1. Cotton spraying nitrogen fertilizer can prevent premature aging: At the later stage of cotton, spraying nitrogen nutrition on cotton leaves can keep cotton leaves green, enhance photosynthesis, prevent denitrification and premature senescence. Mixed spraying of nitrogen fertilizer and "regulator 802" can enhance cotton growth stamina more obviously and increase yield better. From late August to early September, a mixed solution of urea 100 times solution and regulator 802 4000 times solution is sprayed once every 5 - 7 days, continuously sprayed twice-3 times, and each time 75 kg of fertilizer solution is sprayed per mu. 2. Cotton spraying potassium fertilizer can prevent diseases: Cotton potassium deficiency, in the flowering and boll stage prone to red leaf stem blight (blight), cotton leaves become red or yellow, thicker and crispy, and finally fall off, causing premature senescence of cotton plants, resulting in serious yield reduction. Potassium foliar spray can alleviate or inhibit disease while preventing drought. 0.3% potassium dihydrogen phosphate solution, 2% potassium nitrate solution, 1% potassium chloride solution, 5% plant ash soaking (24 hours) filter solution and other foliar spraying, spraying once every 7 - 10 days, continuous spraying 2 - 3 times. For cotton fields with red leaf stem blight caused by potassium deficiency, 3% potassium nitrate solution or 0.3% potassium dihydrogen phosphate mixed with 100 times urea solution can be sprayed once in 5 days, and continuous spraying for 3 times can make cotton leaves turn green quickly. Spray fertilizer solution 75 kg per mu each time, pay attention to spraying wet the whole plant. Third, cotton spraying phosphorus fertilizer can promote early maturity: Spraying phosphorus fertilizer at the later stage of cotton can make seeds plump, increase boll weight and open boll earlier. Generally from late August, each time with 2% calcium superphosphate soaking (24 hours, often stirring) filtrate 75 kg, can also be combined with potassium spray 0.3% potassium dihydrogen phosphate solution. Fourth, cotton spraying boron fertilizer can catch cotton bolls increase: Cotton boron deficiency, lateral branches increased, fruit branches node position high, leaves thickened, buds and flowers easy to fall off, resulting in "buds but no flowers" or "flowers but not fruit", flowers less bolls and low yield. Boron fertilizer spraying in time can reduce flower and boll shedding, which is beneficial to more and bigger peaches. Generally, from the beginning of boll formation, spray once every 15 days, continuously spray 2 - 3 times, spray 75 kg of borax solution of 0.2% per mu each time, add 0.5% urea when spraying boron, the effect is better. Dissolve borax with a small amount of warm water, dilute with cold water and spray. 5. Zinc fertilizer spraying on cotton can effectively improve quality: Cotton is a crop sensitive to zinc. In recent years, with the increase of nitrogen and phosphorus fertilizer application in cotton field, the proportion of macro element and trace element zinc is out of balance. Available zinc in soil can not be supplemented in time, affecting the growth and development of cotton, limiting the improvement of cotton yield and quality. Zinc fertilizer is beneficial to chlorophyll synthesis and growth, can promote cotton to absorb nutrients, coordinate nutrient movement, enhance photosynthesis. Spraying zinc fertilizer on cotton leaves at flowering and boll setting stage can increase peripheral peach, prolong life span of functional leaves, increase lint percentage, improve yield and quality. Foliar spraying 0.2% zinc sulfate solution, generally spraying 2 - 3 times, each time spraying fertilizer solution 75 kg per mu. Cotton foliar fertilizer needs attention: foliar fertilizer should be sprayed before 9 a.m. or after 5 p.m. on sunny days to extend the wetting time of fertilizer solution on leaves and facilitate leaf absorption. To spray fine spray evenly, pay special attention to the cotton leaf back spray, in order to promote absorption, improve fertilizer efficiency. In order to save the process and give play to the joint effect of each nutrient element, the above-mentioned various fertilizers can be mixed according to specific conditions, and can also be combined with pest control and pesticide mixture to make it "one spray multi-effect". Foliar fertilizer should not be mixed with alkaline pesticides, plant ash should not be mixed with other alkaline foliar fertilizers, phosphorus fertilizer should not be mixed with zinc fertilizer. Click for more cotton growing technology Click for more food crop growing technology