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The specific method is: for the yellow leaves, less fruit branches, less flower bells, cotton with premature aging characteristics, spray 1% - 2% urea solution; for the prosperous cotton, spray 2% - --3% of superphosphate solution (superphosphate should be soaked in 10 times water for a whole day, then dilute the clarified mother liquor for use), the concentration should not be too large to prevent burns on the leaves. It is also possible to spray a potassium dihydrogen phosphate solution. The two solutions of nitrogen and phosphorus can be mixed and sprayed, and the leaves are atrophied, the fruit is dense, the plant is short, and the boron-deficient cotton field with serious shedding can be sprayed with 0.2% borax solution or 0.1% boric acid solution. If 0.3%----0.5% urea is added to the boron fertilizer solution, the effect will be better. The time of spraying is generally started in early August and ends in early September. According to the growth of cotton, 1---3 times, each time spraying 100 kg of water, it is better to spray on the back of some leaves in sunny afternoon.
Huaxian Agricultural University Liu Huimin
Skillful fertilization in the late stage of cotton growth
In the late stage of cotton growth, in order to make up for the lack of nutrients absorbed by the root system, the method of root-spraying fertilizer can be used to improve the yield and quality of cotton.
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