According to our survey, each year in the cotton area there are some farmers with good quality varieties of cotton that have different degrees of damage. In this regard, we must sum up the lessons of fertilization mistakes, scientific fertilization, and promote high-yield cotton harvest.

First, understand the poor performance of fertilization. When the base fertilizer was used excessively, the new leaves were delayed after the cotton was planted. The leaves were small, the leaves were dark in color, and the roots were brown. When transplanting fertilization, no fine soil was isolated from the roots of the seedlings, which also caused the cotton seedlings to burn roots. If the concentration of urea is too high at the seedling stage, the edges of the cotton seedlings will be coked, and the contraction of the heart blade will be difficult to unfold. Some young stems turn from green to brown, and the young stalks in the base will be black and the entire cotton seedling will die. The above-mentioned symptoms of fertilizer damage are caused by the reverse osmosis phenomenon caused by the high concentration of soil solution.

Second, find out the fertilizer requirements of cotton. Cotton is one of the crops requiring a relatively large amount of fertilizer, but the required fertilizer at the seedling and bud stage accounts for only 20% to 30% of the total fertilizer requirement. A large number of fertilizers are needed from flowering to bell-mouthing. Therefore, more suitable fertilization experience should be used. Is: at the end of fat foot, Miao Fei speed, bud stable, flower bell fat, Pu Shi peach fertilizer. The proportion of nitrogen, phosphorus, and potassium should be 1:0.3:1.

Again, apply the base fertilizer to the formula. First, where conditions permit, organic fertilizers should be used, and appropriate amount of phosphorus and potassium fertilizers should be used. The total amount of organic fertilizers produced by the farmers should be about 4,000 kilograms, 25 kilograms of phosphate fertilizer and 15 kilograms of potash fertilizer. The second is the use of inorganic fertilizer, should be based on high-efficiency compound fertilizer, high-content mu are applied 25 kg, the content of the mu are applied about 50 kg, and with the application of potash 10 kg, holding 0.4 kg of boron, zinc fertilizer 0.5 kg. The third is the use of hole transplanting seedlings, after fertilization with fine soil isolation, and then planted seedlings.

Fourth, apply quick-acting seedlings. Base fertilizer than the full cotton field, the application of a Miao Fei, the base fertilizer shortage of cotton fields, seedlings should be applied 2 times the top dressing, the first mu are applied urea 5 kg, the second mu are applied urea 8 to 10 kg, can also be used About 25 kg of ammonium bicarbonate, or Shi Qingshui excrement seedlings. Seedlings should be highlighted with quick-effect fertilizers.

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