Appropriate period In general, the entire growth season of the grapes can be applied foliar fertilizer, it is best to spray before the growth of new shoots, "pushing fertilizer", in the flowering, fruiting period spraying "stabilize the fruit stable fertilizer"; fruit enlargement period Spray "strong fruit fertilizer." The effect of spraying boron at flowering stage is good, and the effect of rare earth micro-fertilizer is large at the initial stage of berry softening.

Weather and time foliar spray fertilizer, affected by wind, temperature and humidity. Within a certain range, the higher the temperature is, the faster the leaves suck fat; the higher the humidity, the more the suction fat; the smaller the wind speed, the longer the moisturizing time of the fertilizer solution on the leaves, the more suction fat and the smaller the loss of the drift. In order to increase the effect of spray fertilizer, it is best to choose the windless cloudy spraying. On sunny days, it should be performed in the morning or evening when the temperature is suitable (18°C～25°C), humidity is high, and evaporation is small.

Methods The stratum corneum leaves were thinner than the old leaves, and the amount of fertilizer solution was large. The stomata on the back of the leaves were more than the leaf front and absorbed quickly. Therefore, the application of grape leaf fertilizer should be based on young shoots, young leaves and the back of leaves. Fertilizer fertilizes the fine grain of the fog so as to make it evenly and densely. It is sprayed until the leaves are all wet. It is better to drop the fertilizer solution without falling. According to the needs of a variety of fertilizers mixed spraying, but also with pesticides (including plant growth regulators) mixed spray and prevent pests.

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