In cotton high-yielding cultivation, the requirements for the long-term growth of the cotton plants are different in each growth period, ie, the seedlings must be robust, the buds not steep and long, and no premature failure can be achieved at a later stage. To this end, the cultivation of cotton is generally grasped as follows: Miao Fei should be "light", "Leaf" "control", flower bell fertilizer to "heavy", as appropriate after autumn supplement. This is the basic fertilization principle for high yield cotton.
Miao Fei is light. From the seedling stage to the bud stage, there is very little nitrogen uptake in cotton, which is less than 10%. However, the seedling stage is the critical period of phosphorus nutrition. Although there is a small amount of phosphorus needed, it cannot be deficient in phosphorus. When sowing cotton, 5 kg of diammonium phosphate is added as a seed fertilizer. Fertilizers are placed about 2 cm below the side of the cotton plant. Phosphorus-based seed fertilizer is required for the seedling stage of cotton, which can promote the development of the root system and ensure the seedlings are robust.
Fertilizer "control." Keeping the seedling stage to the bud stage controls the water-controlling nitrogen and the cultivating seedlings, so as to prevent the cotton from becoming steep and buried the bane.
Hua bell fertilizer "heavy." The flowering and boll season is the most vigorous period for cotton growth. It requires more fertilizer, more nitrogen absorption, and higher intensity. The amount of nitrogen absorption during this period accounts for 60%. Phosphorus and potassium are also required to account for more than half of the time needed from bolling to maturing. At the same time, the contradiction between group fertility and individual fertility often occurs during the flowering and boll period. High-yield cotton should be well managed with water and nitrogen to reduce the loss of flowers and bells, so as to bring in peaches, full blooms, and the high yield characteristics of autumn peach tops. On topdressing, the principle of reapplying flower and bell fertilizer and applying top dressing fertilizer was proposed.
In the flowering and bolling period, the topdressing fertilizer is mainly supplemented with an appropriate amount of nitrogen fertilizer (eg, 10-15 kg/mu urea). However, in the absence of potassium fertilizer in the potassium-deficient soil or basal fertilizer, it is also necessary to add 5 kg of potassium chloride. Potash recovery at this time can achieve the effect of promoting the increase of cotton age. Especially for those plots planted with insect-resistant cotton varieties, the amount of potash used was 30% higher than that of ordinary varieties.
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