humic sulfur

例句：

1. 1. Humic sulfur is an important component of soil fertility.
   腐殖质硫磺是土壤肥力的重要成分。
2. 2. The humic sulfur in the soil can improve plant growth.
   土壤中的腐殖质硫磺可以促进植物生长。
3. 3. The humic sulfur in the soil helps to maintain water balance.
   土壤中的腐殖质硫磺有助于保持水分平衡。