When is the right time to beat foliar fertilizer, when can't you do it?

The more suitable time for foliar fertilizer is when the new shoots of tea sprouts in spring, summer and autumn, and when a bud and a leaf first develop. However, we need to pay attention to the choice of windless sunny morning or evening spraying, in the crop seedling stage and flowering stage, as well as high temperature and rainy weather, or just after spraying pesticides can not be applied foliar fertilizer.

First, it is a more appropriate time to apply foliar fertilizer

1, generally in spring, summer and autumn each round of tea sprouts new shoots, grow a bud and a leaf for the first time, choose a windless sunny morning, or evening spray, spray once every 7 days, spray 2-3 times, spray to the leaf surface dripping.

2. During the period, nitrogen, phosphorus and potassium are mainly used, supplemented by micro-fertilizer, and the proportion is 4 ∶-1 ∶ 1. Usually, micro-fertilizer should be proportioned according to the principle of what tea plant lacks and what to make up.

3. The general fertilization concentration is related to fertilizer varieties and weather conditions. According to the experiment, urea is 0.5%, potassium sulfate is 0.5%, calcium superphosphate is 1%, zinc sulfate is 50-100ppm, iron molybdate is 20-50ppm. If the concentration is too high, it is easy to produce fertilizer damage and has no effect.

4. During this period, it can be combined with pest control, sprinkler irrigation and plant growth regulators, not only saving labor, but also easy to achieve mechanization, general fertilizers and pesticides chemical properties, acidic chemical fertilizers with acidic pesticides, alkaline chemical fertilizers with alkaline pesticides, so as not to produce chemical reactions and precipitation to avoid counteracting each other's fertilizer and drug effects.

5. Biological pesticides can be used to control tea plant diseases and pests, which is also a safe, reliable, pollution-free and pollution-free control method with low cost and high control effect. Bt emulsion, cyanobacteria, Beauveria bassiana, agricultural antibiotics and plant antibiotics can be used during this period.

Second, when can not hit foliar fertilizer

1. Seedling stage

In the crop seedling stage, most crops just begin to sprout, or can not be sprayed with foliar fertilizer just after transplanting, because at this time, the crop itself is not only fragile, not so adapted to external conditions, generally spraying nutrient solution, it is easy to cause the phenomenon of burning seedlings and leaves, which is not conducive to the normal growth of seedlings.

2. Flowering period

And crops in the flowering stage can not be sprayed foliar fertilizer, flowering is the stage of pollination and hanging fruit, fertilization in this period is very easy to burn flowers, not conducive to normal pollination to reduce yield and so on.

3. High temperature and rainy weather

Foliar fertilizer is a highly efficient nutrient solution component. If foliar fertilizer is sprayed in high temperature weather, it will cause nutrient evaporation, and the nutrient concentration will be reduced in rainy season, both of which significantly reduce the utilization rate of foliar fertilizer.

4. Just after spraying pesticide

General plants just after spraying pesticides, do not immediately spray foliar fertilizer, because part of the foliar fertilizer mixed with pesticides, it is easy to react, causing drug damage and fertilizer damage, so it is suitable to spray other fertilizers after 7 days of pesticide application.