Abstract
California vegetable and strawberry growers are expecting legislation which will limit their use of fertilizers and water by crop, acreage, and season. An increasing number of growers are adopting drip irrigation, which affords the opportunity for more precise control of water and nitrogen nutrition. Many growers, however, lack the skills and time necessary to manage and monitor water and fertilizer applications effectively in drip irrigation. Consequently, the need for quick, easy, and reliable methods to manage nitrogen fertility with drip irrigation has increased. Two trials were conducted to evaluate the effectiveness of granular controlled release nitrogen fertilizers in fields where excessive water use had been eliminated by using tensiometers and ET data to manage irrigations. A range of management options for maximizing yield and quality in vegetable and strawberry production with reduced nitrogen and water inputs will be discussed.
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