Combined Water-Fertilizer Management to Minimize Non-Point Water Pollution while Achieving High Crop Production

摘要

Greenhouse and field experiments were conducted to characterize relationships between fertilizer and water management in irrigated vegetable production in California. Greenhouse trials were conducted both in hydroponic solution culture and in soil culture, with tomatoes and lettuce, to establish functional relationships between nitrogen and water uptake by single plants, and nitrogen recovery efficiency as a function of method and rate of application and placement for a simulated drip irrigation system with one fertilizer material, urea-ammonium nitrate.