optimum water content

例句：

1. 1. Theoptimal water content for this soil is between 20% and 30%.
   这种土壤的最优含水量为20%到30%。
2. 2.The plant requires a certain amount of water to maintain its optimal water content.
   植物需要一定量的水来维持其最优含水量。
3. 3. The farmer carefully monitored the soil moisture levels to ensure the crop had the optimal water content it needed.
   农民仔细监测土壤湿度水平，以确保作物具有它所需的最优含水量。