稀土＂常乐＂益植素是一种农用稀土产品，其成分是以轻稀土为主的硝酸盐。本文采用灵敏度较高的小鼠胎肝微核试验和精子畸形试验对该农用稀土的硝酸盐的诱变作用进行了检测，结果表明，它对敏感性较高的胎肝微核呈阴性反应，可认为稀土硝酸盐在短期接触情况下对哺乳动物的体细胞未引起遗传学的损伤。精子畸变试验的结果亦表明稀土硝酸盐在较大剂量接触的条件下，未引起哺乳动物生殖细胞的突变作用，可初步推断稀土元素在农业上使用是比较安全的。 Rare earth “Changle” beneficial plant is a rare earth agricultural products, its composition is based on light rare earth nitrate. In this paper, the sensitivity of the mouse fetal liver micronucleus test and sperm abnormality test of the agricultural rare earth nitrate mutagenicity was tested, the results showed that it was sensitive to the fetal liver micronuclei were negative, Rare earth nitrate can be considered in the case of short-term exposure to mammalian somatic cells did not cause genetic damage. The results of the sperm aberration test also showed that rare earth nitrate did not cause the mutation of mammalian germ cells under the conditions of higher dose exposure. It could be preliminarily concluded that it is safer to use rare earth elements in agriculture.