Boron Application Technology of Cotton

In recent years, the statistics of boron fertilizer experiments on cotton showed that the application of boron fertilizer could increase cotton yield in both boron deficient soil (soil available boron less than 0.5 mg / kg) and potential boron deficient soil (soil available boron less than 0.8 mg / kg).

1. Base fertilizer cotton was applied before sowing or nutrition (rice) before transplanting combined with soil preparation. About 0.5 kg of borax per mu can be mixed with nitrogen, phosphorus, potassium and other fertilizers and then applied together, or mixed with fine dry soil.

2. when planting fertilizer in cotton sowing, boron fertilizer strips are applied in the sowing ditch or in the sowing hole. Use about 0.5 kg of borax per mu and mix well with fine dry soil. Special attention should be paid to avoid contact between boron fertilizer and seeds, not to mix seeds with boron fertilizer and not to cover seeds with boron fertilizer, so as not to affect seed germination and seedling growth.

3. Foliar fertilizer cotton mostly uses foliar spraying method to apply boron fertilizer. The advantages of spraying: first, because boron is not easy to transfer from the old tissue to the new tissue in the plant, spraying boron fertilizer can meet the needs of new tissue in time; second, it can save labor by spraying medicine and fertilizer. In the case of serious boron deficiency, fertilizer should be sprayed every 10 days from cotton budding, and a total of 4 times should be sprayed for 6 times, which can achieve a better effect of increasing yield. In the case of mild boron deficiency, it can be sprayed at the bud stage, early flowering stage and boll stage of cotton. The effect of 0.2% borax solution is better. The amount of fertilizer solution sprayed is 30kg / mu in bud stage, 40kg / mu in early flowering stage and 60kg / mu in flowering and boll stage.

The aircraft is sprayed with boron fertilizer, the transport type 5 aircraft is selected, and the constant spraying equipment is carried out for constant spraying operation. During the operation, the airflow is stable, the wind speed is less than 4m / s, the plane speed is 160km / h, the flight altitude is 5m / h from cotton, the width of the operation is 50m, the amount of solution carried by the aircraft is 1000 kg, and the amount of liquid used per mu is 2.5kg (including 0.1kg borax). During the period of spraying boron fertilizer on cotton aircraft, the yield was the highest in bud stage, flowering stage and boll stage.