1. The problem of laying wool irrigation in the field
Matters needing attention when cotton is drip irrigation
At present, 1.25-1.4 meters wide mulching film is mostly used in production, and four rows of cotton are planted on the film. Laying with one film and two pipes is more conducive to the advantages of drip irrigation technology. If the soil is sandy, one film and two pipes must be used.
2. Fertilization
Drip irrigation under the mulch can fertilize with water, so it changes the way we fertilize before furrow irrigation or flood irrigation. Among them, the base fertilizer, refer to the soil nutrient survey, combined with tillage, apply more than 1 ton of organic fertilizer or 100 kg of oil residue per mu, 10-15 kg of diammonium or 20-25 kg of three-material phosphate fertilizer, about 10 kg of urea, and 5-8 kg of potash fertilizer. kg. The top dressing during the growth period should adhere to the principles of light application of bud fertilizer, heavy application of flower and bell fertilizer, and supplementary application of bell fertilizer. Combined with the nature of the fertilizer, the top dressing should be mainly nitrogen fertilizer, supplemented by phosphorus and potassium fertilizers, according to urea and potassium dihydrogen phosphate or high-concentration phosphoric acid Potassium-ammonia fertilizers are applied with drip irrigation at a ratio of 4:1 or 5:1. The amount of topdressing per mu is 10-12 kg in June, 10 kg in July 1-10, 15 kg in July 10-20, and July 20- 10-12 kilograms on the 30th, 15 kilograms on August 1-20, and 5 kilograms supplemented from August 20th to early September.
Approximately 2 kilograms of zinc fertilizer and other micro-fertilizers per mu during the bud stage Foliar topdressing, some growth-promoting regulators can be used in the early stage of cotton growth, with appropriate amount of urea and potassium dihydrogen phosphate foliar spray; before and after the blooming period, some flower-preserving nutrient regulators should be selected, with appropriate amounts of urea and dihydrogen phosphate. Potassium foliar spray. After topping, top dressing should be stopped to prevent the upper leaves from being too large and causing shading in the field.
3. Questions about drip irrigation
According to the water supply and the growth of cotton, drip irrigation. The first drip irrigation time depends on the situation: after sowing, the soil moisture content in the field is insufficient, and the cotton should be drip irrigation in time when the cotton appears dry. In the absence of drought, the more prosperous cotton field should be properly postponed to the full bud stage drip irrigation, and the general cotton field can start drip irrigation at the early bud stage. The first drip irrigation should be less water, generally about 20 square meters. Irrigate once every 7-10 days in the future, and drip irrigation once every 7 days in mid-to-late July. Irrigate 10-13 times during the growth period. Ruoqiang County generally shuts off water in early September.
4. Pest problem
Drip irrigation under the mulch changes the humidity in the field, and the hazards of aphids and red spiders in the field occur early and severely. Pay attention to the situation in the field and timely spray control.
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