(1) Huanghuai sponge area
Fertilization principle
(1) Add organic fertilizer and promote organic and inorganic cooperation.
(2) According to the soil fertility conditions, the amount of nitrogen and phosphorus fertilizers should be appropriately adjusted, and the potassium fertilizer should be applied reasonably, paying attention to the combined application of boron and zinc.
(3) The application of nitrogen fertilizer in stages, increase the proportion of nitrogen fertilizer application in the middle stage of fertility, and reduce the proportion of base fertilizer.
(4) Fertilizer application should be combined with irrigation and flood control techniques and other high-yield and high-quality cultivation techniques.
2. Fertilization advice
(1) Under the condition of 70-90 kg of lint per mu, apply 1-2 tons of high-quality organic fertilizer, 11-13 kg of nitrogen fertilizer (N), 5-7 kg of phosphate fertilizer (P2O5), and 4-5 kg ​​of potassium fertilizer (K2O). . For cotton fields lacking boron and zinc, pay attention to the application of boron, zinc fertilizer, boron fertilizer (borax), zinc fertilizer (zinc sulfate), the dosage of 1-2 kg per mu, and the application of boron fertilizer to the amount of 100-150 g of water. Boron fertilizer is carried out during the bud-flowering period.
(2) 25%-30% of nitrogen fertilizer is used as base fertilizer, 25%-30% is used in early flowering stage, 25%-30% is used in full bloom period, 10%-25% is used as topping fertilizer; 15% phosphate fertilizer is used as seed fertilizer 85% of the phosphate fertilizer is used as the base fertilizer; the potassium fertilizer is used as the base fertilizer or the base chasing (the initial flowering period). Starting from the flowering period, the cotton field with weak growth, combined with the application of mixed spray 0.5%-1.0% urea and 0.3%-0.5% potassium dihydrogen phosphate solution 50-75 kg / mu, spray once every 7-10 days, continuous Spray 2-3 times.
(2) The middle and lower reaches of the Yangtze River
Fertilization principle
(1) Add organic fertilizer and promote the combination of organic and inorganic.
(2) According to the soil fertility status and fertilizer efficiency response, the amount of nitrogen and phosphorus fertilizers should be appropriately adjusted to stabilize the amount of potassium fertilizer.
(3) The cotton field with obvious boron and zinc deficiency should be applied with boron fertilizer and zinc fertilizer; the potential lack of attention should be paid to the application of boron and zinc fertilizer.
(4) For the nursery and transplanting cotton fields, the phosphorus and potassium fertilizers are applied centrally by means of acupoint application or strip application.
(5) Fertilizer application should be combined with irrigation and flood control techniques and other high-yield and high-quality cultivation techniques.
2. Fertilization advice
(1) The yield of lint cotton is 90-110 kg, 1-2 tons of high-quality organic fertilizer is applied, nitrogen fertilizer (N) 13-16 kg, phosphate fertilizer (P2O5) 6-7 kg, potassium fertilizer (K2O) 10-12 kg. For cotton fields lacking boron and zinc, pay attention to the application of borax 1.0-2.0 kg/mu and zinc sulfate 1.5-2.0 kg/mu. High fertility cotton fields and low-yield fields should be appropriately adjusted to about 20% of fertilizer application.
(2) 25%-30% nitrogen fertilizer for base application, 25%-30% for early flowering topdressing, 25%-30% for topdressing, 15%-20% for bell seasoning; 60% of potash is used as a base and 40% is used as a top dressing. From the flowering period to the weaker cotton field, spray 0.5%-1.0% urea and 0.3%-0.5% potassium dihydrogen phosphate solution 50-75 kg/mu, spray once every 7-10 days, continuous spraying 2 -3 times.
(3) Northwest Cotton Region
Fertilization principle
(1) According to the soil fertility condition and fertilizer efficiency response, properly adjust the amount of nitrogen fertilizer, increase the proportion of mid-fertility application, and rationally apply phosphorus and potassium fertilizer.
(2) Make full use of organic fertilizer resources, increase the application of organic fertilizers, and pay attention to the return of cotton stalks to the fields.
(3) Combining fertilization with high-yield and high-quality cultivation techniques, especially the integrated regulation of water and fertilizer.
2. Fertilization advice
(1) Under-film drip irrigation cotton field: under the condition of 120-150 kg lint cotton, the cotton seed cake is 50-75 kg, nitrogen fertilizer (N) 20-22 kg, phosphate fertilizer (P2O5) 8-10 kg, potash fertilizer. (K2O) 5-6 kg; lint yielding 150-180 kg per mu, applying cotton seed cake 75-100 kg, nitrogen fertilizer (N) 22-24 kg, phosphate fertilizer (P2O5) 10-12 kg, potassium fertilizer ( K2O) 6-8 kg. For cotton fields lacking boron and zinc, the water-soluble boron fertilizer is 1.0-2.0 kg/mu, and the zinc sulfate is 1.5-2.0 kg/mu. The boron fertilizer is suitable for foliar application, and the dosage is 100-150 grams per mu. Zinc fertilizer can be used as base fertilizer, and the dosage is 1-2 kg.
The nitrogen fertilizer base fertilizer accounts for about 25% of the total, and the topdressing accounts for about 75% (the bud period is 15%, the flowering period is 20%, the flowering and boll period is 30%, the cotton boll is 10%), and the phosphate and potassium fertilizers account for about 50%. . The number of topdressing times in the whole growth period is about 8 times. From the beginning of the bud period, the topdressing is started, one water and one fat. In the early stage, there were few nitrogen and phosphorus, and there were few phosphorus and nitrogen in the middle and late stages, and irrigation and fertilization were carried out in combination with the drip irrigation system. It is recommended to use special fertilizer for drip irrigation for topdressing, and use common commercial fertilizer for topdressing requires nitrogen to phosphorus ratio (pure nutrient) of 2:1 or higher.
(2) Conventional irrigation (flooding or furrow irrigation) cotton field: per mu of cotton production under the condition of 90-110 kg, applying 50 kg of cottonseed cake or 1-1.5 tons of high-quality organic fertilizer, nitrogen fertilizer (N) 18-20 kg, phosphate fertilizer ( P2O5) about 7-8 kg, potash fertilizer (K2O) 2-3 kg; lint per mu yield under 110-130 kg, apply cotton seed cake 75-100 kg or high-quality organic fertilizer 1.5-2.0 tons, nitrogen fertilizer (N) 20 -23 kg, phosphate fertilizer (P2O5) 8-10 kg, potash fertilizer (K2O) 3-6 kg. For cotton fields lacking boron and zinc, pay attention to the application of boron and zinc fertilizer.
45%-50% of the nitrogen fertilizer in the ground paddy field is used as a base, and 50%-55% is applied as a top dressing. 30% of the nitrogen fertilizer is used in the initial flowering period, and 20%-25% of the nitrogen fertilizer is used in the flowering period. 50%-60% of the phosphorus and potassium fertilizer is used as a base, and 40%-50% is used as a top dressing. The boron fertilizer should be sprayed on the foliar surface, and the dosage of 100-150 grams per mu. Zinc fertilizer is used as base fertilizer, and the dosage is 1-2 kg. (Source: Ministry of Agriculture)
This article URL: 2016 spring cotton science fertilization technical guidance
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