"prescribe the right medicine" to apply foliar fertilizer

When there is a deficiency in crops. Usually in the process of field production, some crops often show some element deficiency. At this time, foliar fertilization is better than soil topdressing fertilizer, and the utilization rate is higher. When the absorptive capacity of crop roots is senescent. In the later stage of crop growth, the root activity of crops often declined and the ability of fertilizer absorption decreased. At this time, if you want to apply fertilizer to crops, it is appropriate to choose foliar fertilizer. When crop growth is affected by adverse environment. When the soil environment is disadvantageous to the growth of crops, such as too much water or too little drought, and when the soil is too acidic or too alkaline, foliar fertilizer spraying can quickly supplement nutrition and meet the needs of growth and development. When soil fertilization is difficult to operate. First, foliar fertilizer is often used for the application of trace elements. Second, for the crops covered with plastic film, in the case of insufficient application of base fertilizer, it is difficult to use soil topdressing, so it is appropriate to choose foliar fertilizer to supplement nutrient needs.