Finally their relevant physiological indexes are determined. The result shows that rare earth nitrate of a certain concentration can improve the cold-resistance of rice seedlings.

The relations between the rare earth elements and the morphological and the physiological properties of the strain were systematically studied on the solid and in the liquid media respectively.

A study on change of contents and distribution of the rare earths in roasted tobacco plant and effects on chemical composition in roasted tobacco leaves of the rare earths was reported.