Abstract
Optimal decision rules and dynamics are characterized for the irrigation management model in the previous paper (Knapp, this issue (a)). For a constant crop and irrigation system, the decision rules are concave in E[s] and SD[s]. That is, seasonal water applications first increase as these variables increase, and then possibly decrease. Optimal water applications are observed to be decreasing in the correlation coefficient, although the effect is small. Optimal water applications and soil salinity follow a cyclical time path with a multicrop rotation. The decision rules for applied water are also found to vary for the same crop depending on place within the crop rotation. A range of irrigation systems are efficient depending on prices and other parameters. Investment dynamics are generally a constant type of irrigation system with possibly an initial transition period of another system type. More complex investment behavior is observed with constrained water supplies.
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