Soil silicon supply capacity is an important basis for deciding whether to apply silicon fertilizer. The greater the degree of silicon deficiency in soil, the better the effect of fertilization and yield increase. Therefore, silicon fertilizer should be preferentially distributed to silicon-deficient areas and silicon-deficient soils. Different crops have different requirements for silicon. Silicon fertilizer is effective for silicon-loving crops. Crops with obvious effect of silicon application mainly include rice, wheat, corn and other gramineous crops, among which rice is a typical silicon-loving crop. Because silicon fertilizer can improve soil, it should be applied to polluted farmland and protected land planted for many years.

(2) Application method.

Silicon fertilizer is not easy to agglomerate, not easy to deteriorate, good stability, no loss such as infiltration and volatilization, and has the characteristics of long fertilizer effect period. Therefore, silicon fertilizer need not be applied every year, but every other year. Its application method can be used as base fertilizer together with organic fertilizer, nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer; Water-soluble silicon fertilizer with high nutrient content can be used as both base fertilizer and topdressing, but the topdressing time should be as early as possible. For example, it should be applied before booting stage in rice production.

(3) dosage.

The application amount of silicon fertilizer should be determined according to the available silicon content of soil in different plots and the water-soluble silicon content of silicon fertilizer. Soil with serious silicon deficiency can be applied more appropriately, and soil with mild silicon deficiency should be applied less. Water-soluble silicon fertilizer with effective silicon content of 50% ~ 60% can be applied 6 ~10 kg per mu; Steel slag silicon fertilizer with effective silicon content of 30% ~ 40% can be applied 30 ~ 50 kg per mu; If the effective silicon content is less than 30%, 50 ~ 100 kg can be applied per mu.