title: Response of Nitrogen Cycling in Alfalfa (Medicago sativa L.) Grassland Systems to Cropping Patterns and Nitrogen Application Rates: A Quantitative Analysis Based on Nitrogen Balance
abstract: An imbalance between the supply and demand of nutrients within the crop-soil system has resulted from the prevalent practice of excessive fertilization in agricultural agriculture. In order to increase crop growth, improve resource usage efficiency, and reduce agricultural nonpoint source pollution, appropriate cropping management techniques are essential. This study examined the effects of four nitrogen application rates (0 kg·ha<sup>-1</sup> (C0), 80 kg·ha<sup>-1</sup> (C1), 160 kg·ha<sup>-1</
journal: Plants