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A Study on the Soil Moisture Controlling Standard of Water saving Irrigation

Chen Yumin Sun Jingsheng Xiao Junfu (Farmland Irrigation Research Institute, CAAS 453003)  
The vaporization loss of soil moisture in farmland happens on two surfaces:one on the soil surface,being called as evaporation;another on the crop surface,being refered to as transpiration.They are both linearly related to soil moisture.Namely,they increase with the increase in soil moisture. Studies of the relationship between soil water and photosynthetic rate have shown that the photosynthetic rate increased with the increase in soil water when soil water is less than 65~69% of field capacity.While soil water is higher than 65~69% of field capacity,the photosynthetic rate decreases as soil moisture increases.Therefore,photosynthesis makes a threshold response to soil moisture.The threshold can be taken as the soil moisture controlling standard of water saving irrigation in the fields.
【Fund】: 国家自然科学基金
【CateGory Index】: S152.7
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