Cotton boron application technology
In recent years, the statistics of cotton boron fertilizers in various regions indicate that boron-deficient soils (effective boron below 0.5 mg/kg in soil) and potentially deficient in boron (soil available boron below 0.8 mg/kg) are available for cotton fertilizer application. Better yield increase effect. 1. Before basal cotton is sowed, or when nutrition (plant) is transplanted, it is applied in combination with site preparation. About 0.5 kg of borax is applied per acre, which can be used together with fertilizers such as nitrogen, phosphorus, and potassium, and can also be applied after mixing dry soil. 2. Seed Fertilizer When the cotton is sown, the boron fertilizer strip is applied to the sowing channel or applied to the sowing hole. About 0.5 kg of borax per acre, mix well with fine dry soil. Special attention should be paid to avoid contact between boron and seeds. It is not advisable to use boron for seed dressing and cover with boron, so as not to affect seed germination and seedling growth. 3. Most of the application of boron fertilizer foliar fertilizer foliar spray method. The advantages of spraying: The first is that boron is not easy to transfer from the old tissue to the new tissue in the body of the plant. Spraying boron fertilizer can meet the needs of the new tissue in a timely manner. Second, it can save labor by mixing the drug and fertilizer. In the case of severe boron deficiency, spray fertilizer should be applied once every 10 days from the bud initiation of cotton, spraying fertilizer 4 to 6 times in total, which can achieve better yield increase. In the case of mild boron deprivation, spraying can be performed at bud stage, early flowering stage and flowering boll stage: times. Fertilizer concentration is better with 0.2% borax solution. The amount of fertilizer solution sprayed: Bud 30 to 40 kg per acre, early flowering 40 to 50 kg, flower and bell period of about 60 kg per mu. The airplane was sprayed with boron fertilizer, transported Type 5 aircraft, and constant spray equipment to conduct constant spray operations. When operating, the airflow is stable, the wind speed is less than 4m/s, the speed of the aircraft is 160km/h, the flying height is 5-7m from cotton, the operating width is 50m, the amount of solution carried by the aircraft is 1000kg, and the fluid volume per mu is 2.5kg ( Borax containing 0.1 kg), spraying 400 mu each time. During the period of spraying boron fertilizer, cotton airplanes also produced the highest yields at the bud stage, flowering period, and flower and boll stage.
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