Analysis of Water Supply and Demand for Spring Corn in China

The concept of crop water requirements is discussed,based on which the calculation method of crop water requirements is established.Using the newest crop and meteorological data,the water requirement of spring crops in China is calculated,and its distributoin is discussed.The satisfied degree of water demands for spring corn is evaluated by using water correction factor.The results indicate that the climate is suitable to the production of spring corn,except in April,May and June,which is the time of planting,emergence and jointing for spring corn.Some measures such as relevant planting technology,saving irrigation and manual rainfall should be taken to alleviate the drought.

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