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利用仪器中子活化分析测定玉米不同生长期不同部位的单一稀土含量。结果表明：稀土元素在玉米植株体内主要是向结实及生命活动旺盛部位运转。玉米植株在生长各阶段对元素La，Ce，Nd的吸收最为敏感。这3种元素可能是作物体内活性物质的主要激活剂。
Instrumental neutron activation analysis was used to determine the single rare earth content in different parts of corn at different growth stages. The results showed that rare earth elements in corn plants mainly to strong parts of life and activity of the operation. Corn plants are most sensitive to the absorption of La, Ce and Nd in all stages of growth. These three elements may be the main activator of active substances in the crop.