1. Precipitation and effective precipitation: The suitability of precipitation depends on factors such as the conditions of the ground, the nature of the soil, the intensity of precipitation, the state of soil moisture at that time, and the water requirements of the crop.
The so-called "soaking" refers to the fact that once a precipitation process has increased soil moisture, the crop can maintain normal growth over a long period of time. Raining requires a large amount of precipitation and can penetrate to a sufficient depth. The earlier the soil becomes drier, the greater the amount of rainfall needed to make it drizzle. The greater the intensity of precipitation, the greater the loss of runoff, the lower its effectiveness, and the greater the amount of rain required to evaporate, but the greater the evapotranspiration losses if the rainfall is too small.
2. Precipitation time: Precipitation time also has a great influence on the growth and development of crops. The effect of precipitation is weak when the crops have weak water absorption capacity and rainfall.
3. Effective precipitation: The part of the natural precipitation that actually supplements the soil moisture in the root layer of the plant is called: effective precipitation.
4. The direct effect of precipitation: The direct effect of precipitation on crops can not be ignored, and late grain filling often results from rainfall.
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