Crop "three sprays" to choose time

In production, we noticed that most of the crops are flowering and pollinating in the morning, such as melons, beans, etc. The normal pollination and fertilization of crops usually takes several hours to complete. Moreover, it must be free from rain and rain. Because the pollen is lost to vitality after being wetted by rain, it cannot be pollinated and fertilized, resulting in “flowers and unreality”. There is no fruit and no direct effect on crop yield. Most crops that can be fruited by pollination, such as melons, beans, corn (2322, -7.00, -0.30%), wheat, etc., if they are "three sprays" during flowering, or have not yet completed in the crop When pollinating and fertilizing, "three sprays", the pollen is easily sprayed wet by the fertilizer and liquid, and it loses its vitality.
The flowers that have been thanked will never be opened again. The flowers that have not been given powder and pollinated will not open again. Therefore, for crops that rely on flowering pollination to bear fruit, if it is necessary to “three sprays” during the flowering period, it should be carried out after the crop has been pollinated and fertilized. Do not engage in “artificial rainfall” during pollination and fertilization, generally in the afternoon. When the crops have been completed, pollination and fertilization have been completed. For those crops that bloom on the ground and have underground results, they are generally not subject to this condition. However, if you want to pay attention, you must do it after 3 pm to 4 pm.
The concentration of “three sprays” should not be too large, and should not exceed the maximum concentration value to avoid causing crop damage; the mixed spray fertilizer should be strictly matched with the proportional concentration; the acidic fertilizer should not be mixed with the alkaline fertilizer to avoid It will lose its effect due to chemical reaction; the "three-spray" fertilizer should be used up on the same day to avoid reducing the use effect.