Growth promoters(trace mineral elements) has no effect either.

微量矿物元素效果也不显著。

It also contains some trace mineral like nickle, arsenic and antimony.

并含有镍﹐砷﹐锑等少量元素。

The essential trace mineral, selenium, is of great importance on human health.

硒是人体必需的微量矿物质，对健康有着极其重要的作用。

Selenium is a trace mineral that is found in the soil and becomes absorbed in the food chain.

硒是一种微量元素，土壤含量丰富，可由食物链吸收。

Research shows a decline in the trace mineral content of fruits and vegetables grown in the conventional method.

研究表明，传统的水果和蔬菜种植方法会使微量元素的含量下降。