SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com
1. Agricultural irrigation mainly adopts three water-saving systems such as drip irrigation, sprinkler irrigation, and center-rotary spraying. The drip irrigation ratio is about 90%, and the utilization rate of water can reach over 97%. The utilization rate of water for sprinkler irrigation and central rotation system irrigation reaches 70% and 80% respectively.
2. The sources of irrigation water include surface water (river, reservoir) and groundwater (dig), as well as municipal waste water, slightly salted water, processed seawater, etc. (The non-food crops such as cotton are mainly irrigated with treated municipal waste water and micro-brine water. ).
3. The method of controlling water conservation is to raise the price of water substantially; the second is to promote water-saving irrigation systems.
4, irrigation. Around the Mediterranean Sea, the range of rainfall around 350 mm in the growth period is controlled; in the eastern region, the cotton area is controlled at about 1000 mm. The head water is generally about 70 days after sowing, and the number of drip irrigation after the head water is more frequent, generally about twice a week.
Second, fertilization technology
1, all straw returned to the field.
2. Sub-basal fertilizer and top-dressing fertilizer are applied, in which base fertilizer is applied in the fall and when the straw is returned to the field; top-dressing is applied together with irrigation equipment and irrigation water.
3, top dressing types. Mainly for N, P and K fertilizers, calcium sulfate is added to the salinized land.
4, based on fertilization. Soil fertility level; expected yield, irrigation method, regulation ability.
5, the amount of application: N: sprinkler irrigation 80 ~ 120kg / ha (pure N, the same below), drip irrigation 250 ~ 280kg / ha; main varieties are ammonia, ammonium sulfate, potassium nitrate, diammonium phosphate, urea and so on. P: 600-800kg/ha, containing 8-80% pure P fertilizer.
K: Apply one to two years or 100 Kg/ha of pure K depending on soil conditions.
Third, other technologies
1. Pest control. Combining the planting of transgenic insect-resistant cotton with mechanical spraying of pesticides, the number of chemical control during growth is less than 5 times.
2, weeding. Herbicides use trifluralin and glyphosate in addition to trace herbicides or herbicide-tolerant transgenic cotton through drip irrigation equipment.
3, field growth automatic monitoring system. The use of instruments to monitor the growth of cotton, stem diameter, plant height, plant water, temperature, nutrition and soil conditions, automatic transport to the computer terminal, timely master the cotton growth process, determine the amount of irrigation and fertilizer. Far-infrared remote sensing testing of aircraft was also conducted. The optimal growth rate was: Plant height increased by 2 cm per day after flowering.
4, density and yield structure. Row spacing 1m, plant spacing 8 to 12/m, density 80,000 to 120,000/ha, 11 bolls per plant, single boll weighing 6.2g, l3~35%.
I. Irrigation technology