First, prepare before broadcast
1. Variety selection: According to the climate and soil conditions, the reproductive period is about 130 days, and the resistance to verticillium wilt is selected; the plant type is compact, the fruiting branches are short I~II type, and the angle of implantation is small; the leaves are moderately small, the petiole is short, and the fritters are not easy to occur. Strong bolls and good fiber quality. Such as 9665, JD ~ 3, Fengmian 8, Jiumian 2 and so on.
2. Deep base fertilizer: The amount of chemical fertilizer is 8 to 12 kg of pure nitrogen, 7 to 10 kg of phosphorus pentoxide and 3.5 kg of potassium oxide. When ploughing out the crops, the manure and calcium superphosphate will be deeply turned. In the spring, when combined with soil preparation, 20 kg of ammonium nitrate phosphorus, 20 to 23 kg of diammonium phosphate, and 6 to 10 kg of potassium sulfate were mixed as a base fertilizer.
3. Chemical weeding: Before sowing with film, 48% of the dimethoamine 100-150ml or 50% acetochlor 80g per acre, dilute 2-3kg, mix 50kg of fine sand, evenly spread into the cotton field , shallow into the soil to suppress the sowing.
Second, sowing
1, do a good job of equipment preparation: Before the broadcast of the equipment for a comprehensive inspection and debugging, to install a good laying drip irrigation capillary device to achieve safe use.
2, the appropriate sowing: When the 5 cm temperature stable through 10 °C, as the beginning of sowing. The best sowing date is from April 15 to April 20 in normal years. Six to eight seeds per hole are sown, and the depth of seeding is 2 to 2.5 cm, and the thickness of cover soil is 1 cm.
3, sowing method: the use of a film two-tube water-saving technology. Four rows of cotton with a 145-cm film thickness are planted at 30+60+30cm, spacing between the membranes is 45cm, plant spacing is 15cm, and 1.1 to 13000 plants per mu. The laying and filming of the drip tape and the sowing are performed in the same manner. The drip tape is set in a narrow row with the hair surface of the drip tape facing upwards, ie, the flow path is upward. Be careful to pull out a drip tape after the locomotive stops to prevent the drip tape from shrinking.
Third, dripping and fertilizing
1. Drip in seedling stage: generally after laying the seedlings, the ground branch pipe and the attached pipe are laid. In early June, it is necessary to start dripping, each time 18 to 20m3/mu, and the drip irrigation cycle is 7 to 8 days. Fertilizer with water-soluble fertilizer drip, usually with urea and a small amount of potassium dihydrogen phosphate, 6 drops twice, each drop of urea 3 kg, potassium dihydrogen phosphate 100 g. Drip method: adjust the middle of the filter Pressure regulating valve, so that the pressure difference of 0.1mpa, generally 1 hour after the start of fertilization, drip, 30 minutes before the end of drip, each tank drop time is 40 minutes to 1 hour. The standard of dripping water is based on the appearance of wet holes, wet 30cm.
2. Hualing Shui: Starting from mid-July, increase the amount of dripping fertilizer, each dripping 23 ~ 25 m 3 / mu, drip cycle of 5 ~ 7 days, while increasing the amount of fertilizer, each drop of urea 4 ~ 5 Kg, potassium dihydrogen phosphate 200 grams. Dripping standards are all wet under the film, wet 60cm. From the ground, generally the outermost line of cotton plants see wet, the ground does not fill water, a bit wet. Stop dripping of urea before August 10th.
3, late drip: From August onwards can be appropriate to reduce the amount and frequency of drip, each drip 20 meters 3 / mu, drip cycle is about 8 days. Water will be stopped before September 8. At the last drop of water, the amount of drip may be increased according to the conditions of the field to ensure that there is sufficient twist in the boll opening period. During the whole growth period, it dripped 12 to 14 times, the total amount of dripping water was 250 to 280 m3/mu, drops of urea were 25 to 27 kg, and potassium dihydrogen phosphate was 2 kg.
Fourth, chemical regulation Drip irrigation cotton growth and development of sound, coordinated, control of early, light, and diligent.
1. Seedling stage: For the first time during the period of 2 to 3 leaves, 0.2 to 0.3 g of adipic acid is sprayed on each acre. After drip of water, 0.5 to 0.6 g of dramidine is sprayed on the cotton field that is more prosperous.
2. Bud stage: sprayed diaminos 1.5 to 2 grams per 7 to 10 days.
3. Flowering and bolling period: Before the topping, mu 2 to 3 g of DDP are used, and after 7 to 10 days of topping, 7 to 8 g of DHA is used for re-control.
V. Pest control
My county cotton pests are mainly aphids. Prevention and control of aphids to biological control, with insecticide coated stem or artificial control. When the area is large, the system can absorb 100-200 g/mu of monocrotophos or 80 g/mu of 85% carbofuran with water droplets. The effect can reach 95% after three days of application.
VI. Recycling residual film, drip tape
After the cotton is harvested, it is necessary to take back the drip irrigation belt. After the culm is cut, the residual film fragments should be picked up to prevent soil contamination. Other field management is the same as conventional irrigation.
Seven, drip irrigation precautions
1. Diligently inspect the pipe joints, the joints must be firm, and check the plumbing pipe heads when watering. There should be no broken holes and the ground can not be water. When watering, pay attention to the water pressure and irrigation conditions. If the water pressure suddenly decreases If it is small, check whether the pipe strip is broken or not, and if the joint is peeled off, handle it in time.
2. The irrigation must be started in early June and the irrigation must be stopped in early September. The area of ​​irrigation should not be too large. The area of ​​each wheel irrigation group should not exceed 30 mu. When the water is turned on, one round of irrigation group is opened each time. When one round of irrigation group is completed, the next round of irrigation group should be started, and then the previous round of irrigation group should be closed. When the system is in progress, the pressure gauge must be strictly controlled and the system should be controlled at the design pressure to ensure that the system can operate safely and effectively. Every farmer should obey the unified operation and management, and they should not open the valve in a random manner, let alone make a hole in the pipe.
3. Avoid stepping on the pipe belt during the field operation, and prevent damage to the pipe strip and the plastic film.
4, drip, chemical control should also be based on the soil, weather and cotton growth flexibility, according to local conditions.
5. Fertilizer used for drip irrigation must be water soluble. Nitrogen fertilizers in water-soluble fertilizers include ammonium nitrate, urea, and various nitrogen-containing solutions; phosphate fertilizers include phosphoric acid; potassium fertilizers include potassium chloride; compound fertilizers include monoammonium phosphate, diammonium phosphate, potassium dihydrogen phosphate, potassium dihydrogen phosphate, and nitric acid. Potassium and so on.
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