The best time to apply fertilizer

The most suitable fertilization time for orchid plant is the day after watering, the temperature is above 15 ℃, the temperature is below 30 ℃, and there is light. Because the substrate and root system are still wet after watering, the orchid plant will not suck fertilizer liquid too dry and cause fat injury. At low temperature, the physiological activity of the plant slows down, is in a semi-dormant state, and does not absorb fertilizer; at high temperature, the water evaporates quickly, the concentration of residual fertilizer will be relatively increased, and there will be more or less side effects; in cloudy and rainy days, the air humidity is high, water is not easy to evaporate, and the root is not easy to absorb fertilizer. Only when the light is warm, it is most suitable to fertilize. Similarly, this is also the most suitable time for foliar fertilizer spraying. In order to improve the effect of foliar fertilizer spraying, it should be sprayed at 16: 17 on a sunny day. Because this time is weak, it is not easy to produce fertilizer damage, and the stomata of the leaves are open, so there are more opportunities for absorption. In addition, with the help of night dew, land moisture and high humidity air, the fat and liquid attached to the leaves can flow, thus increasing the chance of being absorbed. (Xu Dongsheng)