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The seedlings are “lightâ€. The cotton uptake from the seedling stage to the bud stage is very small, less than 10%; but the seedling stage is the critical period of phosphorus nutrition, although the phosphorus needs less, it can not be deficient in phosphorus; when planting cotton, 5 kg of diammonium phosphate is applied. Fertilizer. The position of the seed fertilizer was about 2 cm below the side of the cotton plant. The phosphorus-based seed fertilizer is needed for the seedling stage of cotton, which can promote the development of roots and ensure the seedlings are robust.
The bud fertilizer is “stable†to maintain water control and nitrogen control in the seedling stage to the bud stage, so as to avoid the formation of cotton steep and long and the root cause.
Flower bell fertilization “heavy†The flowering and bolling period is the most prosperous period of cotton growth. It requires more fertilizer, more nitrogen, and greater intensity. The nitrogen uptake during this period accounts for 60%. Phosphorus and potassium are also required to account for more than half of the time from ringing to buxing. At the same time, the flowering and bolling period often has the contradiction between group birth and individual childbirth. High-yield cotton should grasp the management of water and nitrogen, reduce the loss of flowers and bells, and achieve the high-yield characteristics of peaches, vulgares and autumn peach tops. In the topdressing, the principle of reapplying flower bell fertilizer and applying topping fertilizer was put forward.
The topdressing in the flowering and boll period is mainly to add appropriate nitrogen fertilizer (such as 10-15 kg/mu urea), but in the case of potassium deficiency soil or base fertilizer without potassium fertilizer, this time should add 5 kg of potassium chloride. At this time, chasing potassium can achieve the effect of increasing cotton age. Especially for those plots where insect-resistant cotton varieties are planted, the amount of potash is higher than that of ordinary varieties.
Appropriate supplements after autumn In high-yield and super-high-yield cultivated cotton fields, once the growth momentum of cotton bolls is found to be weakened or automatically capped, 5-8 kg of urea should be added in time to prevent the early decline of cotton plants for autumn peach.
In short, in the high-yield cotton topdressing, we must master Sheng Lei - the first flower to chase the first fat, the flower bell to chase the second fat, and the essentials of fat supplementing after the fall. For insect-resistant cotton varieties, the amount of potassium fertilizer is higher than 30% of the common varieties.
The method of topdressing should be mixed with fertilizer and timely watering. Urea should not be applied to avoid loss of volatilization or fumigation of cotton leaves. Some of them are used to sprinkle urea on the surface and rain, neither reclaiming soil nor timely irrigation. This method of application is unscientific. (Senior Consultant of Sinochem Fertilizer Co., Ltd., Professor of China Agricultural University Cao Yiping)
In high-yield cotton cultivation, the requirements for cotton plant growth are different in each growth period, that is, the seedlings should be strong, the bud period is not steep, and the high yield can be obtained without early premature aging. To this end, the topdressing of cotton is generally as follows: the seedling fertilizer should be “lightâ€, the bud fertilizer should be “controlledâ€, the flower bell fertilizer should be “heavyâ€, and supplemented as appropriate after the fall. This is the basic fertilization principle for high-yield cotton.
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