It is suitable for cotton to apply fertilizer skillfully to prevent disease and increase yield in the later stage.

In the later stage of cotton growth, the nutrient absorption capacity of cotton root decreased obviously, but if nitrogen, phosphorus, potassium, zinc, boron and other fertilizers were sprayed on cotton leaves, it could prevent premature senescence, promote early maturity, prevent disease, prevent boll falling and bear big peach. It has a significant effect on increasing production.

1. Applying nitrogen fertilizer to prevent premature senility with 1% urea solution 75 Mu 100kg per mu, spraying once every 5 Mill 7 days for 3 consecutive times, can enhance the photosynthesis of leaves, prevent premature senility and increase yield.

2. Spraying phosphate fertilizer on the leaves of precocious cotton in the later stage can promote the fullness of seeds, increase boll weight and open bolls earlier. The method is to use 1000 grams of calcium superphosphate plus 50 kilograms of water, spray after soaking for 12 hours, 75 kilograms per mu.

3. Applying potash fertilizer to prevent disease cotton is lack of potassium in the later stage, which is easy to occur blight in the boll setting stage, resulting in a serious reduction in cotton yield. The method of spraying potash fertilizer on cotton leaves is that the whole plant is sprayed with 0.3% potassium dihydrogen phosphate solution 75ml 100kg per mu, and the whole plant is sprayed for 3 times.

4. Applying zinc fertilizer to prevent boll drop cotton is easy to lack zinc in the later stage, which will cause local chlorosis of leaves, wilting of young leaves, shedding of new bolls, and it is difficult to protect peach top. The method of spraying zinc on cotton leaves is that 0.1% Mu of 0.2% zinc sulfate or zinc chloride solution is sprayed 75 kg per mu, once every 5 mi 7 days, and 2 Mel is sprayed 3 times in a row.

5. Boron fertilizer is easy to lack boron in the later growth stage of big peach cotton, which increases the node position of fruit branches and lateral branches, resulting in fewer flowers and bolls and lower yield. Timely spraying boron fertilizer is beneficial to multi-fruit peach and big peach. Generally, 0.2% boric acid solution is sprayed 100 kg in full bloom for 3 times.