Under what circumstances it is best to use foliar spray fertilizer. Fertilization on foliar is an auxiliary method for crop fertilization. In addition to relying mainly on roots to absorb nutrients from the soil, the crop can absorb nutrients, but it cannot replace root fertilization. Foliar fertilization is mainly used to help crops supplement some micro-nutrients or growth regulators, which is also necessary to increase crop yield and improve quality. In addition, under certain special circumstances, such as the late stage of the field crop reproductive growth stage is also an important period of yield formation, fruit and other parts of the ground lack of calcium and boron and other micronutrients, and this time the root activity decreased, nutrient absorption capacity weakened, This needs to be supplemented by foliar fertilization; in addition, when there is no irrigated condition in the surface soil during hot and dry seasons, the transport of nutrients to the soil is not smooth, or in the plots of stagnant water, the root system of the crop is deprived of oxygen and the crop cannot be grown. Under the special circumstances of normal absorption, foliar fertilizers should be used. The main problems solved by foliar fertilization are the supply of trace elements; the second is to ease the difficulty of roots to absorb nutrients temporarily.
The main advantages and disadvantages of foliar fertilization are faster absorption of leaves than roots and can provide nutrients to plants quickly. But the disadvantage is that the amount of application is limited and the effect is short-lived. The efficiency of leaf nutrient is related to the structure of the leaf, and the permeability of the leaf to mineral nutrients is low, especially the horny thick leaves. Leaves of crops such as olives, citrus and coffee. Fat droplets do not easily penetrate the leaves, and the droplets of the liquid fertilizer slide down from the surface and cause loss. If it rains quickly after spraying fertilizer, the rain will lose liquid fertilizer. High-temperature spray fertilizer in windy weather will cause the fertilizer solution to dry quickly on the leaf surface. These conditions may reduce the effect of foliar fertilization.
In addition, its advantages are: direct supply of nutrients fast, to avoid the fixation and degradation of nutrients in the soil, nutrient use efficiency is higher than the soil fertilization.
The disadvantage of foliar fertilization is that the fertilizer effect is transiently limited and it is a supplementary fertilization method.
Foliar fertilization to grasp the skills to choose the fertilizer composition, foliar fertilizer is mainly the supply of trace elements, but the combination of a large number of trace elements is conducive to the absorption and utilization of nutrients. To determine fertilizer varieties, we must first look at the needs of crops, and second, we must look at soils to limit the types of nutrients and increase the specificity of foliar fertilization. We do not choose Shiquanda rehydration solution, which is both expensive and untargeted. The effect is not good. For example, to solve the chlorosis of the new peanut leaves in northern China, it is necessary to spray iron, etc.; to increase the 1000-grain weight of winter wheat, spray urea and potassium dihydrogen phosphate.
The concentration of leaf fertilizer should be set. If the concentration is too high, the leaves will be damaged, but the fertilizer effect will be reduced. If the concentration is too low, it will not work.
Spraying fertilizer time and weather conditions should be selected, for example, to avoid spraying fertilizer before rain; growth period should be selected critical period of nutrient efficiency.
The frequency of spraying fertilizer is usually more than two sprays to be effective, and the specific number of times depends on the effect.
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