| On condition that Shaanxi Province's food security is guaranteed,its grain production needs the minimum standard of agriculture water resources.Rice,wheat,maize and soybean are used as the main objects in the study.The total volume of Shaanxi Province's demand for grain can be got when the average standard per person is provided.According to the total water requirements and the quantity of the effective use of rain water for grain crops' production in Shaanxi,the volume of water needed for irrigation can be calculated in which the minimum value is the safety threshold.The computed result indicates that Shaanxi Province's agricultural water resources safety threshold is 68.63×108 m3,while its agricultural water resources are not safe,so it should accelerate the development of water-saving agriculture and improve the effectiveness of rain water use. |