urea nitrogen concentration

例句：

1. 1.The soil test showed a high level of urea nitrogen concentration in the area.
   土壤测试显示该地区尿素氮浓度较高。
2. 2.The plant's growth is closely related to the urea nitrogen concentration in its soil.
   植物的生长与其土壤中的尿素氮浓度密切相关。
3. 3. To ensure optimal crop yield, it is important to maintain a balanced urea nitrogen concentration in the soil.
   为了确保作物产量最优，保持土壤中尿素氮浓度平衡至关重要。