Crop water production function and optimal allocation of irrigation water use
1993
Shaozhong, K. | Minggang, Z. (Northwestern Agricultural Univ., Yangling, Shaanxi Province (China). Dept. of Water Conservancy)
Water production functions for summer corn, spring wheat, and winter wheat as well as cotton have been established according to the data of several irrigation experiment stations, the law for the sensitivity index (lambda) of these crops varying with the growing time has been analysed. The result has shown that these crops are the most sensitive to water deficit occurring in the stage of heading to milking, and the less sensitive in the stage of seeding and maturing periods. The relationship between the sensitivity index (lambda) and growing time is an unsymmetrical bell shape curve for summer corn, spring wheat and cotton, having the steeper slope on decreasing than on increasing period, but the curve of winter wheat has two maximum values, one is at tillering stage before winter season, and the other is at booting stage. A general method to determine optimal allocation of irrigation water use is discussed.
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