What is the role of foliar fertilizer?

1. Make up for the lack of root fertilization

When the root system is underdeveloped or the root system is declining during the growth period of the crop, the ability of the root system to absorb nutrients is weak. Foliar fertilization can strengthen the seedlings and reduce the grains and increase the yield. Or when the soil environment is unfavorable for the growth of crops, such as excessive water, drought, excessive soil acidity, and alkalinity, which hinder the absorption of crop roots, and the crop needs to quickly resume growth; or during the process of crop growth, the crop has already shown For some nutrient deficiency diseases, in the above two cases, since it takes a certain time for the nutrients to be absorbed by the crops using soil fertilization, it cannot meet the needs of the crops or alleviate the symptoms of crop deficiency in time. At this time, foliar fertilization is used, then It can make nutrients quickly enter the plant body, supplement nutrients, solve the problem of nutrient deficiency, and meet the needs of crop growth and development.

2. Avoid fixing or transforming nutrients in the soil

The soil is a complex colloid. After fertilizer is applied to the soil, certain nutrients are adsorbed by the soil colloid, or sediments are formed due to changes in soil pH. Such as P, Zn, Cu, Mo, etc., are easily fixed when applied to the soil and reduce fertilizer efficiency. Foliar fertilization can avoid fixation and improve fertilizer efficiency. Some physiologically active substances are easy to decompose in the soil and transform to affect the effect. Foliar fertilizer is applied to the leaves and transported through sieve tubes, ducts or plasmodesmats. The distance is close, so as to avoid the transformation and leaching of nutrients in the soil. Improve fertilizer efficiency and fertilizer utilization.

3. Reduce soil pollution

Adopting the method of foliar fertilization to appropriately reduce the amount of soil fertilization can reduce the nitrate content in the plant and the residual mineral nitrogen in the soil. On the saline soil, the soil fertilization may increase the concentration of the soil solution and increase the soil salinity change. Taking foliar fertilization measures not only saves the amount of fertilization, but also reduces soil and water pollution, which is an effective fertilization technology that kills two birds with one stone.

4. Prevention and treatment of physiological diseases

The application of foliar fertilizer can meet its needs for related nutrients, change the composition of the microbial flora on the surface of the leaf, such as making the spore germination and community growth of Erysiphe graminis down; promote urease, phosphatase, ascorbic acid oxidase, carbonic acid The activity of anhydrase and arginase is increased to prevent and control certain physiological hazards.