EFFICIENT SURFACE FERTIGATION OF HIGH VALUE HORTICULTURE CROPS

The research reported herein aims at the development of a management guideline for surface Nfertigation systems for high value horticultural crops in the low desert regions of Arizona and California. A complete set of performance indicators for the combined resource management system were identified and defined. A numerical model that solves the one-dimensional advection equation in the surface irrigation stream and a zero-inertia based surface hydraulic model were developed. The surface water movement and solute transport models were coupled with the popular subsurface water movement and solute transport model (Hydrus 1-D). Field experiments were performed to develop a database for use in the calibration and validation of the coupled surface-subsurface water movement and solute transport model. The coupled nitrogen transport and surface irrigation simulation model will then be used to develop improved management guidelines for surface N-fertigation systems.

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