When the available boron content in the soil is lower than 0.8 mg, the application of boron fertilizer has a relatively obvious increase in production. When the soil is deficient in boron, the effect of basal fertilizer application is best, and the effect of multiple application is less. Generally, 0.5-1 kg of borax can be applied per acre. In the case of extreme boron deficiency, spraying with 4-5 shots is more effective than spraying 2-3 shots. When the content of available boron in soil is high, the method of using foliar spraying is better, generally 2-3 times, if boron is used as base fertilizer, borax sand can be 0.25-0.75 kg. Do not contact with seeds when basal fertilizer is used, nor can it be sprinkled directly under the seeds; it can also be mixed with nitrogen, phosphorus, and potassium fertilizing as basal fertilizer, or applied in the form of spraying; foliar spraying with bud stage, early flowering stage, and flowering boll stage. For the main period.
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