Why should fungicides not be watered before and after root irrigation?

Why should fungicides not be watered before and after root irrigation? Please introduce the reason why it is not suitable to be watered before root irrigation with fungicides. First, because the root disease of crops has already occurred, if watered, the germs will spread with the running water, resulting in more dead trees. Second, because watering can easily lead to the decline of soil air permeability, root hypoxia, retting roots, reduced stress resistance, so that pathogens are easier to infect. In addition, watering and then root irrigation, the solution is more difficult to seep, too much pesticide is also easy to make the soil air permeability worse, easy to cause crop retting roots, aggravate the occurrence of dead plants, so it is not suitable to water before root irrigation. It is not advisable to water the roots immediately after using fungicides. Watering immediately after root irrigation will quickly dilute the solution in the soil and reduce the effect of sterilization and disease prevention. Therefore, try not to water the roots for a few days after using fungicides. After using fungicide to irrigate the root, once the crop appears wilting, yellowing, stopping growth and other drug damage symptoms, it can be irrigated to avoid causing greater losses. Remedial measures: first, quickly watering once to dilute the concentration of traditional Chinese medicine in the soil; second, timely use of rooting agent or Aidoushou or Yunda 120 spray plus root irrigation, which is conducive to alleviate drug damage and restore plant growth. Click to get more fungicide use technology click to get more pesticide use technology