The absorption and nutrient content of cotton increased with the increase of its yield, and the absorption ratio of NPK was about 1.0:0.3:1.0. The ratio of NPK fertilizer is about 1:0.65:1.0. Generally, 40% of the nitrogen fertilizer is used as the base fertilizer, 40% is used as the flower fertilizer, and 20% is applied when the peach is started. Phosphate fertilizer is better to be applied as a base fertilizer. Potassium fertilizer has better effect on the application of base fertilizer and top dressing. Cotton has good reaction to zinc and boron, and attention should be paid to the application of zinc fertilizer and boron fertilizer.
Manure, compost and nitrogen fertilizer. They are commonly used in cotton fields, and cotton fields are generally used per hectare (about 1 hectare in 1 hectare).
30-45 tons are used as base fertilizer, and high-yield cotton fields are 45-75 tons per hectare. In the general cotton field, in the case of applying a total nitrogen of 112.5-150 kg per hectare, 37.5 kg of pure nitrogen is used as the base fertilizer, and the soil is applied to the soil before the ploughing together with the farmyard manure (the rest is topdressed in the flowering and bolling period), and good results can be obtained. . In the middle and upper soil, the loamy soil has strong ability to maintain fertilizer and fertilizer. The nitrogen fertilizer is applied twice, and the base fertilizer is applied for about 45%. The other time is about 55% in the flowering and bolling period. The cotton field with high soil fertility and strong fertility ability can also use the appropriate amount of nitrogen fertilizer as the base fertilizer; for the cotton field with poor soil fertility, sandy soil and poor fertilizer retention capacity, the nitrogen fertilizer can be applied in three times, ie 30% of the base fertilizer, bud The topdressing fertilizer is 20%, and the flowering and seasoning is 50%.
Potassium fertilizer has a good effect on the application of base fertilizer and top dressing, and the application of base fertilizer alone has a good effect. Potassium fertilizer should be applied according to the condition of soil fertility. On the basis of nitrogen and phosphorus application, potassium chloride or potassium sulfate should be applied 135-150 kg per hectare in medium-weight cotton field, and potassium chloride or potassium sulfate should be applied per hectare in medium and low-grade cotton field. About 225 kg.
Boron fertilizer can be used as base fertilizer, seed fertilizer and top dressing. The cotton field with severe boron deficiency (effective boron in soil is less than 0.2 mg/kg) is applied to the seeding ditch or transplanting ditch and acupoint in the seedling ditch with 3.75-7.5 kg per hectare. Miao Lei period: cotton seedlings and buds have little demand for nutrients. Generally, cotton fields can be used without top dressing under the conditions of applying base fertilizer. However, in the case of cotton and wheat double-cropping, since the cotton seedlings are affected by wheat fertilizer during the symbiotic period of cotton and wheat, the growth is weak, and appropriate topdressing is needed to promote growth. After the wheat is harvested, it is necessary to cultivate the cockroach as soon as possible, and to apply the fertilizer to the shallow water. Generally, the amount of fertilizer used is about 52.5-75 kg per hectare or 2250-3750 kg of decomposed manure.
Phosphate fertilizer is mainly used as base fertilizer, which can meet the needs of cotton during the whole growth period, so cotton is generally no longer applied with phosphate fertilizer.
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