Summary
WP by increasing yield and/or reducing ET always results in net savings, thus reducing agricultural water requirements.This is a key point in assessing the opportunities for true water savings in horticultural crop cultivation and will be addressed in detail later in this paper.Water productivity in irrigated agriculture varies widely and depends on many biophysical and management factors.Because variations in ET among crops are within an order of magnitude apart, by far the most important factor infl uencing WP is the economic value of the product.Horticultural products are usually high value and thus WP normally exceeds that of fi eld and row (agronomic) crops.For example, using current values for yield and ET characteristic of California agriculture, the WP of corn is about 0.20 $/m 3 ,
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