trace element fertilizer

例句：

1. 1. Tomatoes are a good source of vitamins and trace elements.
   西红柿是维生素和微量元素的良好来源。
2. 2. The soil needs to be enriched with trace elements to improve its fertility.
   土壤需要添加微量元素来提高肥力。
3. 3. Trace elements play an important role in plant growth and development.
   微量元素在植物生长和发展中起着重要作用。