When the soil effective boron content is less than 0.8 mg, the application of boron fertilizer has a significant yield increase effect. When the soil is deficient in boron, the effect of applying the base fertilizer is the best, and the effect of multiple application is better than that of the less application. Generally, 0.5-1 kg of borax can be applied per acre. When the boron is extremely deficient, if the root top dressing is used, spraying 4-5 times is better than spraying 2-3 times. When the soil available boron content is high, the method of foliar spraying is better, generally 2-3 times. If boron is used as base fertilizer, borax 0.25-0.75 kg can be applied. Do not contact the seeds when making the base fertilizer, or sprinkle directly under the seeds; or mix and apply with the nitrogen, phosphorus and potassium fertilizers used as the base fertilizer; spray the leaves on the bud stage, the initial flowering stage and the flowering and bolling stage For the main period.
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