First, choose the appropriate spray fertilizer: cotton has different purposes for fertilization under different growth stages, and the fertilizer composition is different. Therefore, the appropriate foliar fertilizer should be selected according to the different growth stages of cotton and its deficiency. In order to promote the early development of cotton or prevent premature aging in the late stage, nitrogen fertilizer and phosphate fertilizer may be sprayed. In order to promote the growth of vegetative organs, nitrogen fertilizer and potassium fertilizer may be sprayed, and trace element fertilizer is used according to the growth state of the crop.
Second, extend the time of spraying the foliar fertilizer moist leaves: the longer the leaf surface is wetted by the foliar fertilizer, the stronger the attachment ability of the foliar fertilizer on the leaf surface, and the higher the leaf surface absorption rate. The wetting time is generally required to be in the range of half an hour to one hour. In order to achieve this requirement, a moistening agent (neutral detergent, concentration of 0.1% to 0.2%) is added to the foliar fertilizer when spraying the fertilizer to lower the water. Surface tension increases the adhesion of the solution to the foliage. Some leaves have a waxy layer on the surface, which is not conducive to the wet leaf surface and absorption of the solution, so spraying on the back of the leaf is also better.
3. Spraying with urea: After the different fertilizers are dissolved in water, the penetration force into the leaves is different, while the effect of fertilization outside the roots is different. Generally, urea has the best osmosis effect, and urea is a neutral fertilizer. It has little damage to stems and leaves. Mixing urea and other fertilizers can improve the ability of other fertilizers to penetrate the foliage and improve the spraying effect. However, it is forbidden to use this method in the long cotton fields.
Fourth, pay attention to the location and frequency of spraying: different mineral elements have different ability to move in plants, so the number and location of spraying should be different. For some mineral elements with poor mobility, attention should be paid to spraying on the parts requiring fertilizer, such as cotton supplementing iron, which should be sprayed on young leaves, and the number of fertilization should be increased appropriately. Elements that are highly mobile (such as potassium) can be sprayed to increase the absorption area. It should be noted that if it rains within 24 hours after spraying, it needs to be re-sprayed. Generally, foliar fertilizer containing mineral nutrients is sprayed 60-75 kg per acre, and sprayed 2 to 3 times.
5. Reasonable concentration of spray solution: In actual production, most cotton farmers tend to make the concentration of foliar fertilizer too high. Production practices have proven that foliar fertilizer concentrations are too high or too low to be unreasonable. The scientific and reasonable preparation concentration is: urea 1% to 2%, potassium hydrogen phosphate 0.2% to 4%, superphosphate 2% to 4%, diammonium phosphate 1% to 1.5%, zinc sulfate 0.1% to 0.2%, chlorine Potassium or potassium sulfate is 1% to 1.5%, and iron sulfate is 0.05% to 0.3%.
6. Choose the appropriate time for topdressing: For cotton with tendency to defer and premature aging, spray 1% to 2% of urea aqueous solution. For cotton with strong growth, spray 2% to 3% of superphosphate. Calcium aqueous solution or 800 to 1000 times potassium dihydrogen phosphate. The time of fertilization outside the root generally ends from the beginning of July to the middle of August, and is sprayed 2 to 3 times according to the growth of the cotton plant. The spraying time is usually in the morning or evening, or it can be sprayed on a rainless cloudy day to extend the liquid.
7. The external spray fertilizer should be even: when spraying outside the root, the spray surface should be as uniform as possible, avoid leakage and re-spray. If the cotton root fertilization is carried out according to the above method, it can really exert the effects of less fertilizer, high fertilizer utilization rate, quick effect, etc., and thus obviously increase cotton yield.
Huaxian County Shang Hongyan
Second, extend the time of spraying the foliar fertilizer moist leaves: the longer the leaf surface is wetted by the foliar fertilizer, the stronger the attachment ability of the foliar fertilizer on the leaf surface, and the higher the leaf surface absorption rate. The wetting time is generally required to be in the range of half an hour to one hour. In order to achieve this requirement, a moistening agent (neutral detergent, concentration of 0.1% to 0.2%) is added to the foliar fertilizer when spraying the fertilizer to lower the water. Surface tension increases the adhesion of the solution to the foliage. Some leaves have a waxy layer on the surface, which is not conducive to the wet leaf surface and absorption of the solution, so spraying on the back of the leaf is also better.
3. Spraying with urea: After the different fertilizers are dissolved in water, the penetration force into the leaves is different, while the effect of fertilization outside the roots is different. Generally, urea has the best osmosis effect, and urea is a neutral fertilizer. It has little damage to stems and leaves. Mixing urea and other fertilizers can improve the ability of other fertilizers to penetrate the foliage and improve the spraying effect. However, it is forbidden to use this method in the long cotton fields.
Fourth, pay attention to the location and frequency of spraying: different mineral elements have different ability to move in plants, so the number and location of spraying should be different. For some mineral elements with poor mobility, attention should be paid to spraying on the parts requiring fertilizer, such as cotton supplementing iron, which should be sprayed on young leaves, and the number of fertilization should be increased appropriately. Elements that are highly mobile (such as potassium) can be sprayed to increase the absorption area. It should be noted that if it rains within 24 hours after spraying, it needs to be re-sprayed. Generally, foliar fertilizer containing mineral nutrients is sprayed 60-75 kg per acre, and sprayed 2 to 3 times.
5. Reasonable concentration of spray solution: In actual production, most cotton farmers tend to make the concentration of foliar fertilizer too high. Production practices have proven that foliar fertilizer concentrations are too high or too low to be unreasonable. The scientific and reasonable preparation concentration is: urea 1% to 2%, potassium hydrogen phosphate 0.2% to 4%, superphosphate 2% to 4%, diammonium phosphate 1% to 1.5%, zinc sulfate 0.1% to 0.2%, chlorine Potassium or potassium sulfate is 1% to 1.5%, and iron sulfate is 0.05% to 0.3%.
6. Choose the appropriate time for topdressing: For cotton with tendency to defer and premature aging, spray 1% to 2% of urea aqueous solution. For cotton with strong growth, spray 2% to 3% of superphosphate. Calcium aqueous solution or 800 to 1000 times potassium dihydrogen phosphate. The time of fertilization outside the root generally ends from the beginning of July to the middle of August, and is sprayed 2 to 3 times according to the growth of the cotton plant. The spraying time is usually in the morning or evening, or it can be sprayed on a rainless cloudy day to extend the liquid.
7. The external spray fertilizer should be even: when spraying outside the root, the spray surface should be as uniform as possible, avoid leakage and re-spray. If the cotton root fertilization is carried out according to the above method, it can really exert the effects of less fertilizer, high fertilizer utilization rate, quick effect, etc., and thus obviously increase cotton yield.
Huaxian County Shang Hongyan
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