单语范例（未经PONS编辑处理）
英语
- Yield will decrease proportionally to the drop in N fertilizer input.opinion.inquirer.net
- N fertilizer accounts for 50-60 percent of crop yield.opinion.inquirer.net
- N fertilizer drives increasing yields in agricultural systems more than any other variable, yet only 50 percent of what is applied ends up in the plant.e360.yale.edu
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