Why is cotton off-fertilized? How do we fertilize cotton?

Because of the relatively heavy rainfall, cotton fields have been with varying degrees of leaf yellowing, blind stink bugs and other diseases, which directly lead to the shedding of young shoots. Part of the cotton area appeared boron deficiency and potassium deficiency symptoms. Then what should be done about cotton de-fertilization? What is the remedy for cotton de-fertilization? The following to understand it.

Cotton fertilizer loss causes

①Pre-fertilization under the loss of fertilizer is serious, the late rainy season is too long for fertilizer, some of the cotton before the crop of wheat (oil) transplantation is too late to fertilize the base fertilizer, fertilizer is not timely.

②On the other hand, the fertilizer formula is not reasonable enough, fertilization method is not appropriate, some farmers will be spread on the surface of the cotton field, the loss of fertilizer is more. At present, to strengthen the cotton classification management as soon as possible after the rain, and strive to resist the disaster to win a good harvest.

Remedial measures for cotton fertilizer loss

①Cotton effective flowering period and effective boll period is long, the application of extra-root fertilizers can make up for the loss of yield. The fertilizers that can be applied are urea solution or potassium dihydrogen phosphate solution or 0.01% solution of plant growth promoter bubonic acid (brassinolide). Depending on the localized growth of cotton, it can be applied one or two times.

② cotton on the demand for fertilizer: seedling nitrogen absorption accounted for five percent, five percent of phosphorus, potassium accounted for two percent; now buds to the first flower absorbed nitrogen accounted for eleven percent, phosphorus accounted for seven percent, potassium accounted for nine percent; the beginning of the flower to flower absorbed nitrogen accounted for fifty-six percent, phosphorus accounted for twenty-four percent, potassium accounted for 56 percent; water flushing to flocculent period absorbed nitrogen accounted for twenty-three percent, phosphorus accounted for percent of nitrogen, fifty-two percent of phosphorus, forty-two percent of potassium.

Summary: Cotton fertilizer requirements throughout the reproductive period in general was "less - more - less" dynamic change law. Seedling absorption is less, after the bud absorption increased significantly, the boll stage reached a peak, the flocculation period decline, when the root absorption capacity is weakened, resulting in a rapid decline in absorption. Cotton fertility stages of nitrogen, phosphorus, potassium absorption characteristics are also different, nitrogen absorption in the pre-flowering (flowering to flowering) to reach the peak, phosphorus, potassium absorption in the late stage (flowering to flocculation) to reach the peak, in favor of phosphorus, potassium nutrient application for more bolls and early maturity.