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增施氮肥是增产粮食的一项重要措施。但在施用氮肥时确定一个合适的用量很重要。施用量不足固然不能发挥作物的生产潜力;施用
Adding nitrogen fertilizer is an important measure to increase grain output. However, it is important to determine an appropriate level of nitrogen fertilizer. Insufficient amount of application does not, of course, give full play to the potential of the crop; application