Dynamic Fertilizer Nutrient Demands for Corn: A Cointegrated and Error‐Correcting System
构建了玉米氮、磷、钾养分需求的动态模型，利用协整和误差修正方法证明养分需求在短期和长期均缺乏价格弹性，为农业政策制定者提供更准确的肥料需求预测依据。
Abstract Past studies of the demand for fertilizer have typically been based on static models which assume that adjustments toward equilibrium are instantaneous. This article builds on past studies by developing a dynamic model of nutrient demands of corn. Unit root and cointegration tests demonstrate that fertilizer demands of corn are dynamic. Therefore, statistically correct estimates can be obtained using a dynamic model. A set of error‐correction models for nitrogen, phosphate, and potash use in corn production are estimated. Results provide strong statistical evidence that nutrient demands of corn are price inelastic both in the short and the long run.