In the late growth stage of cotton, the absorption function of its roots to nutrients is significantly reduced. At this time, the leaf absorption function is used to supplement nutrients with foliar spray fertilizer. It has the functions of preventing premature senescence, preventing diseases, preventing falling bells, attacking peaches and promoting early maturing, and increasing yield. The income increase effect is remarkable. The specific technology is:
1, nitrogen spray to prevent premature aging. In late August to early September, nitrogenous fertilizers are sprayed on the leaves to keep the leaves of the cotton green, enhance photosynthesis, prevent premature aging, and increase production. The method is to use 1% urea solution 75-100 kg per mu, or formulate 1% urea and 3000-4000 times 802 mixture, each mu mixed solution 75 kg, sprayed every 5-7 days, Spray 2-3 times.
2, spray potassium and disease prevention. In cotton, potassium deficiency often leads to stem blight disease during flowering and ringing. The cotton leaves are yellow-red and brittle, causing the cotton plant to prematurely decline production. Spray 0.3% potassium dihydrogen phosphate solution, 75 kg per acre spray the whole plant, even spray 2-3 times; or use 5% ash immersed in the filter spray, can prevent decay and disease prevention.
3, spray zinc anti-drop bell. Zinc deficiency in cotton causes partial loss of green manure in leaves, young leaves wilting, and new young bells fall off. The zinc spray method is: Spraying 0.1-0.2% concentration of zinc sulfate or zinc chloride aqueous solution of 75 kg per acre, spray once every 5-7 days, spray 2-3 times continuously.
4, spray boron attack peach. The cotton plant lacks boron, the Fruit branches are high in section, there are many lateral branches, and the leaves are thick. The buds of the buds are easy to open and fall off, resulting in buds without flowers, flowers without real, flowers with little bells, and small peaches with low yield and timely spraying. Boron, supplemented with boron nutrients, is beneficial to multi-fruited peaches and large peaches. Generally from the flowering and boll stage, every 10-15 days, spraying 0.2% borax or 0.1% boric acid solution 75-100 kg per acre, spraying 2-3 times continuously, such as adding 0.5% urea when spraying, Better results.
5, spray phosphorus to promote premature. Starting from late August, use superphosphate 1 kg plus water 50 kg, soak for 24 hours (frequent stirring), filter to residue, spray 100 kg per mu with filter solution, or spray 300-500 times with potassium supplement Potassium dihydrogen phosphate solution 100 kg, once every 5-7 days, and even sprayed 2-3 times, can make cotton plants grow robustly, promote cotton boll development and full seeds, increase boll weight, advance boll scum.

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