No sooner had the fruit trees been fertilized than it began to rain. Do you need to fertilize them again?

After fertilizing plants, if it rains after one night, it will not affect the fertilizer efficiency. Because during this time, most of the nutrients in the fertilizer are absorbed by plants, even if the rain dilutes the remaining fertilizer efficiency, it will not have any impact on plants, and there is no need to supplement fertilizer. If it rains immediately after fertilization, it depends on the size of the rain. If it rains heavily, the rain will wash away the fertilizer and affect the absorption efficiency of plants, so it needs to be supplemented when the weather is good. And if the rain is small, it is the rain in Mao Mao, so there is no need to supplement fertilizer, because the rain in Mao Mao will not wash away fertilizer, but will promote the absorption of fertilizer and make plants grow faster and better. Fertilization in rainy days is a serious waste. If fertilization is applied in rainy days, the fertilizer will be dissolved by rain water, and then quickly decomposed and volatilized on the soil surface, and only a small part will be absorbed by plants, resulting in the loss of most fertility.

Moreover, the utilization rate of fertilization in rainy days is very low, which wastes a lot of fertilizer and increases the cost of farmers' investment in farming for no reason. You must check the weather forecast in recent days to stop taking medicine. Now the weather forecast is very accurate, especially the recent weather forecast can be accurate to the minute. Avoid using drugs in rainy days. If there is no obvious effect, no pests or diseases can not be controlled, or the growth of weeds can not be inhibited, it should be sprayed again or supplemented. However, if re-spraying is needed, pesticide varieties with different action mechanisms should be selected to avoid drug resistance and phytotoxicity caused by overdose of the same type of pesticide. Adding additives can increase the spreadability, adhesiveness, permeability and rain erosion resistance of the liquid medicine, which is more conducive to the absorption and utilization of the liquid medicine. Therefore, when taking medicine, you can add orange peel essential oil, which doubles the efficacy.

If the pesticide on the surface of the fruit has dried up before the rain, it means that the pesticide has been absorbed almost. If the rain is light and the time is short, in order to avoid excessive pesticides, we can consider giving up spraying. When spraying pesticides on fruit trees, it is hoped to choose pesticides with rain erosion resistance and good system performance, such as chlorantraniliprole. In principle, after spraying, as long as the time exceeds 2 hours, the rain will hardly affect the efficacy. Spraying leaves are easily washed away by rain, so root irrigation or toxic soil can be considered, so that the impact of rain will be much smaller, and it can also play a role in sterilization and insecticidal.