英文文献：The Effect of Farming Practices on Reducing Excess Nitrogen Fertilizer Use: An Iowa Case Study
英文文献作者：Huang, Wen-Yuan,Uri, Noel D.
英文文献摘要：
A nitrogen balance model is used to investigate the adoption of a crop rotation and the limitation on the application of nitrogen fertilizer to reduce excess nitrogen. For a farmer initially planting corn continuously, the adoption of a soybeans-corn rotation will have a smaller compliance cost but it will not eliminate the excess application of nitrogen fertilizer under a relatively low nitrogen fertilizer to corn price ratio. An explicit limitation on nitrogen fertilizer use would be needed to achieve this objective. Limiting nitrogen fertilizer use on cropland susceptible to a high potential for leaching will have a smaller compliance cost than on cropland with a moderate potential for leaching.