For high-yield cotton, there are clear requirements for growth in different growth stages, that is, the seedling stage should be strong, the bud period is not steep, and the high yield can be obtained without early premature aging. To this end, in cotton fertilization: seedlings should be "light", buds should be "controlled", flower bells should be "heavy", and supplemented as appropriate after the fall. This is the basic fertilization principle for high-yield cotton. It is mainly determined by the laws and characteristics of cotton absorption at different growth stages. For example, from the seedling stage to the bud stage, the nitrogen uptake of cotton 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; the flowering and bolling period requires more fertilizer and more nitrogen absorption. Nitrogen absorption accounts for 60% . Cotton also accounts for more than half of the phosphorus and potassium needed to mature from knotting to boll opening. In order to meet the law of nutrient demand in different growth stages of cotton, strive for high yield, and propose the following amendments to fertilization:
   base fertilizer. In addition to the application of 10 kg of potassium chloride and 10 kg of diammonium, plus 6 kg of urea. Moreover, the base fertilizer should be deeply applied to the soil for the growth of cotton in the middle and late stages.
Add fertilizer. Apply 5 kg of diammonium as seed fertilizer at the time of sowing . 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 cotton seedling stage, which can promote the development of the root system and ensure the seedlings are robust.
   Measures to control water control and cultivating seedlings from the seedling stage to the bud stage. In order to avoid the formation of cotton steep and long to bury the bane.
   Appropriate adjustments were made during the flowering and seasoning. In addition to 10 to 15 kg of urea, 5 kg of potassium chloride is added . To mix the soil and water and timely water, do not apply urea, so as not to cause volatile loss or smoked cotton leaves. At this time, chasing potassium can increase the yield.
   If it is found that the late growth of cotton is weakened or automatically capped, it is necessary to add 5 kg of urea in time to prevent premature aging of cotton plants and fight for autumn peaches.
In short, in the fertilization of high-yield cotton, it is necessary to grasp the principles of deep base fertilizer, light seedling fertilizer, stable bud fertilizer, heavy flower weight, and appropriate supplement after autumn. For insect-resistant cotton varieties, the amount of potassium fertilizer is higher than that of ordinary varieties.Electronic Universal Testing Machine
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