The principle of foliar fertilization

The root system is the main organ for crops to absorb nutrients. In addition to roots, the foliage (or stem) of crops can also absorb nutrients through stomata, osmosis and ion exchange. The fertilizer used for foliar fertilization is usually called foliar fertilizer. Foliar fertilization is an important supplement for crops to absorb nutrients, which is used to make up for the deficiency of nutrient absorption by roots. However, foliar fertilization can not replace the soil application of a large number of element fertilizers. The characteristics of foliar fertilization compared with soil fertilization, foliar fertilization mainly has the following characteristics: 1, strong pertinence, what to make up; 2, quick effect, direct use by crops after foliar absorption, shortening the way of transportation; 3, to avoid contact with soil, reduce soil fixation, volatilization, leaching loss and other losses, high fertilizer use efficiency; 4, less dosage, save fertilizer, reduce cost 5. Trace element fertilizers are mostly supplemented by foliar fertilization. 6. When the root system of crops is underdeveloped at seedling stage, the root function declines and the nutrient absorption is at its peak under the condition of middle and late growth or stress, spraying foliar fertilizer can quickly and effectively supplement the deficiency of root nutrient absorption.