Foliar fertilization
1. Supplementary root fertilization
When the crop is inconvenient for root fertilization, such as the late stage of crop growth, root activity declines, and the ability to absorb fertilizer decreases; or when the soil environment is unfavorable to crop growth, such as excessive water, drought, soil acidity, and alkali, causing crop roots. Absorption is blocked, and crops need to resume growth quickly. If the root application method can not meet the crop needs in time, only foliar application can be used to quickly supplement nutrients and meet the needs of crop growth and development.
2. Quickly replenish nutrition
In the process of crop growth, crops have shown some nutrient deficiencies, because the use of soil fertilization requires a certain amount of nutrients to be absorbed by the crops, and can not alleviate the symptoms of crop deficiency in time. At this time, using foliar fertilization, nutrients can quickly enter the plant through the leaves, solving the problem of deficiency.
3. Give full play to fertilizer efficiency
Some fertilizers such as phosphorus, iron, manganese, copper, zinc fertilizer, etc., if applied as roots, are easily fixed by the soil, affecting the application effect, and foliar application is not limited by soil conditions. For example, some fruit trees and other deep root crops absorb less nutrients. If traditional fertilization methods are difficult to apply to the root absorption site, they can not fully exert their fertilizer efficiency, while foliar spray can achieve better results. effect.
4. Economical
Various trace elements are essential nutrients in the process of crop growth and development, but the application amount is very small, such as molybdenum fertilizer, the application amount per acre is only a few tens of grams, and it is not easy to apply evenly according to the root application method. Only by foliar application can it be cost effective. According to research estimates, the general crop sprays boron fertilizer on the foliar surface, and the utilization rate of boron is 8.18 times that of the base application. From the perspective of economic efficiency, foliar application is more cost-effective than roots.
5. Reduce soil pollution
The application of nitrogen fertilizer to the soil is likely to cause the accumulation of nitrate in groundwater and vegetables, which is harmful to human health. About 75% of the nitrates absorbed by humans come from vegetables. If foliar fertilization is adopted, appropriately reducing the amount of soil fertilization can reduce the nitrate content in plants and residual mineral nitrogen in the soil. In salinized soil, soil fertilization may increase the concentration of soil solution and increase the salinization of the soil. The use of foliar fertilization measures not only saves the amount of fertilization, but also reduces the pollution of soil and water sources. It is an effective fertilization technique with two advantages.
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