First, the foliar fertilization period: flowers and trees foliar fertilization generally before and after flowering, fruit period, before the winter and other periods for targeted fertilization. Each period of fertilization is performed once every 7-10 days, two or three consecutive times. During the vegetative growth period, more nitrogen and potassium fertilizers are applied. Phosphate fertilizer is applied more during flower bud formation and fruit growth. Different fertilizers have different spraying effects at different times. For example, phosphorus fertilizer and zinc fertilizer are sprayed at the initial flowering stage, and molybdenum fertilizer has better spraying effect before flowering.
Second, the types of fertilizers: to make the flowers of the ornamental flower colorful, fruit and flowers and fruits Fengmao, first of all to meet their requirements of the three basic nutrients N, P and K, but also can not lack other trace elements - ---Calcium, magnesium, sulfur, iron, zinc, boron, molybdenum, copper, manganese. Commonly used foliar fertilizers: urea, potassium dihydrogen phosphate, ammonium phosphate, potassium phosphate, ferrous sulfate, calcium phosphate, magnesium sulfate, zinc sulfate, boric acid, ammonium molybdate, copper sulfate, manganese sulfate and the like.
Third, the foliar spray concentration: fertilization and flowering also pay attention to different fertilizers to prepare different concentrations, urea: 0.2-0.5%, dihydrogen phosphate
Potassium 0.3-0.5%, superphosphate 0.5-1.0%, magnesium sulfate 0.2%, potassium sulfate 0.05-0.5%, zinc sulfate 0.5-1.0%, boric acid 0.1-0.2%
Ammonium molybdate 0.01%, copper sulfate 0.01-0.02%, manganese sulfate 0.05-0.01%. No matter what fertilizer, spray concentration is generally below 0.5%. Care should be taken to avoid that if the concentration is too large, it is easy to cause damage to flower and wood burns. However, the amount of drug is insufficient and the effect of fertilizer is poor, which does not produce very good results.
Fourth, flowers and trees foliar fertilizer application site: fertilization, it is best to spray the drug on the back of the leaves, so that the drug is infiltrated into the pores and easy to absorb. Foliar fertilization is not only to spray the outer periphery of the flower and tree crown, but also to spray the inner leaf of the tree. The upper and lower leaves must be sprayed. In addition, we must pay attention to uniform spraying, fine spray, and good atomization so as to receive good results.
V. Foliar spray suitable period: Fertilizer must be timely and fully absorbed, and related to temperature, humidity and weather conditions. When the temperature is between 18-25°C, the stomata of the leaves will be fully opened. Fertilization will greatly improve the fertilizer effect. When the temperature exceeds 30°C, the stomata of the leaves will be closed, and the sprayed fertilizer will be difficult to be absorbed by the leaves. Can not spray, so as not to cause injury; When the humidity is high, the fertilizer solution stays on the leaves for a long time, more nutrients are absorbed; when the air humidity is small, fertilization is not easily absorbed by the leaves. Therefore, the foliar fertilization is generally conducted on a sunny or cloudy day with no wind, and it is best to spray in the early morning or late afternoon. When the leaves have fog, they should be sprayed after the leaves are dry, and spraying is strictly prohibited. High-intensity sun exposure, windy weather, and spray fertilizer before the rain.
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