The vigorous promotion of cotton scientific fertilization is an important measure to increase the per unit area of ​​cotton yield and product quality. The requirements of ammonia, phosphorus, and potassium three elements of cotton and fertilizer application technology field efficacy test results prove that for every 100 kg of seed cotton produced, pure nitrogen 5.0 kg, phosphorus pentoxide 1.8 kg, potassium oxide 4.0 kg, nitrogen: five oxidation Diphosporium: Potassium oxide was 1:0.36:0.8. Reasonable base fertilizer. Basal fertilizer should be dominated by organic fertilizers, with a certain proportion of chemical fertilizers. In general, 2000 kg per mu or 5000 kg of cow manure. Because phosphorus is difficult to move in the soil, and cotton is particularly sensitive to phosphorus in the early stage of growth and development, so the phosphate fertilizer should be used as a base fertilizer, generally using 50 kg of superphosphate per acre. Superphosphate is best mixed well with organic fertilizers and then applied deeper to reduce the contact surface with the soil. Calcium, magnesium, phosphate fertilizers should be applied first with organic fertilizers or heterotrophic fertilizers for 7-10 days after fermentation. Stable application of fertilizer. The principle of the application of bud fertilizer is to require the cotton plant to be stable but not mad. It can not only lay a good shelf, but also show buds, early flowering and early peaches, laying a good foundation for high yield. Miaofei should be dominated by organic fertilizers and phosphorus and potash fertilizers. Generally, 1,500 kilograms of pigs, 100 tons of cow dung or 100 kilograms of cakes should be used per acre. Reapply flower bell fertilizer. Hua Tuling fertilizer should account for about 50% of the total top dressing, generally 25 ~ 25 kg of compound fertilizer per acre with sifted soil miscellaneous fertilizer or dry fine soil 2000 kg mix, in the early flowering period to the lower part of the sitting 1 ~ 2 large bells cover the soil after the application of the ditch to increase fertilizer utilization. The physiological boron requirement of cotton and boron fertilizer application technology The effective boron content in arable soil of our province. The results of the second soil survey showed that the effective boron content in the cultivated soil of our province was seriously insufficient, with an average of only 0.26 mg of effective boron per kilogram of soil. If the effective boron content per kilogram of soil proposed by the Nanjing Institute of Soil Science of the Chinese Academy of Sciences is taken as the criticality of boron deficiency. As a result, 94.3% of the province's soil has insufficient supply of available boron. Cotton is a dicotyledonous plant. The amount of boron needed is greater than that of monocotyledonous plants. The amount of boron in the plants is high. The normal amount of boron per kilogram of plants is 20 to 35 milligrams, but less than 20 milligrams is insufficient for boron. From the seedling stage, cotton absorbs boron nutrients, which account for 45.4% of the cumulative total for the whole growth period. 69.55% of the boron absorbed by cotton is distributed in the reproductive organs. Boron fertilizer can promote the growth and development of roots, increase the physiological function of roots, promote early growth of strong seedlings, increase the leaf speed of true leaves, promote the operation of carbohydrates in cotton plants, and coordinate the balance of growth and development of cotton plants, which is beneficial to cotton. Stable, long-term, premature, not prematurely, can effectively prevent the phenomenon of "bud without flower" in cotton, reduce the rate of shedding of the bells, increase the number of peaches per plant, weight of bolls, and lint, which can improve cotton quality and increase Fiber length and lint. When cotton is deficient in boron, the growth of roots is blocked, the lower leaves become larger, the new leaves at the top become smaller, the petiole has infiltrated bands, the growth point of the main stem is damaged, the axillary buds are clustered, and the bud bells fall off, and the phenomenon of buds without flowers is serious. The corolla is shortened and difficult to spread, making it hard to grow into peaches, which seriously affects cotton production. Cotton boron fertilizer application techniques are as follows: Boron base application. Every acre with 0.5 to 1 kg of borax and 2,000 kilograms of screened soil miscellaneous fertilizer or dry fine soil and spread in the soil, and then ploughing the soil preparation, and then sowing or transplanting nutrition. For fertilizer. Each acre with 0.5 to 1 kg of borax and 2,000 kilograms of soil miscellaneous fertilizer or dry fine soil after mixing in the sowing or transplanting ditch, hole. Special attention should be given to Shihyun, avoiding contact with seeds, not dressing, not planting, or applying directly underneath the seeds so as not to interfere with seed germination and seedling growth. Foliar spraying. Foliar application of boron fertilizer not only avoids the loss of leaching, but also avoids the direct chemical contact between boron and soil. It is the most economical and effective method of application. At the same time, fractional spraying better satisfies the need for boron at different growth stages of cotton. Spray period. The best period for spraying boron fertilizer on cotton leaves was bud stage, early flowering stage and flowering boll stage. Application amount. In general, 200 grams of borax per acre has the best effect on spraying 100 kg of water on the foliage.
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