Economic Feasibility of Variable‐Rate Technology for Nitrogen on Corn
比较了三种氮肥管理策略（恒量、三率和多率技术）在玉米种植中的经济可行性，发现恒量施用在低肥力均质田块更盈利，而变量技术能改善地下水质量或提高产量。
Abstract The economic feasibility of three different fertilizer management strategies (constant rate, three‐rate and multiple‐rate technology) in the application of nitrogen fertilizer to corn are compared under different probability distributions for field fertility. A constant rate was more profitable than either variable‐rate technology system for homogeneous fields with low fertility. The application area at which the relative profitability between systems changed was largely determined by the characteristics of the fertility distribution rather than by assumptions regarding costs. Variable‐rate technology improves groundwater quality in low‐fertility fields by reducing total fertilizer applied and in high‐fertility fields by increasing corn yield.