A TERNARY COMPLEX ON RARE EARTH-AMINO ACID-VITAMIN USED AS PLANT GROWTH REGULATOR AND THE PREPARATIO

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The present invention provides a ternary complex on rare earth earth-amino acid-vitamin used as plant growth regulator. The complex has the general formula : REX-(AA)Y-VI-SZ, in which X=1-2; Y=0-2; Z=0-5; RE is a tervalent ion selected optionally from La, Ce, Pr, Nd and Sm; the primary ligand (AA) is amino acid selected from cystine, tyrosine, glycine, glutamic acid, leucine, proline, lysine, phenylalanine, threonine, valine and so on; the secondary ligand VI is vitamin selected from vitamin B, vitamin C, vitamin D and so on, the solvent S is one or more of tetrahydrofuran, methanol, ethanol, and/or dimethylsulfoxide. The yield of plant with root tuber or stem tuber can be increased by 20-56% and the quality thereof can be improved by 1-2 grades when applying such plant growth regulator on the plant. The advantages of the preparation method thereof lie in lesser processes and shorter reaction period.