| Vetiever grass (Vetiveria zizanioideis ) is a perennial gramineae plant with high plant and bunches of production clump, a kind of good tropics forage grass, which has many uses, especially being taken as one inexpensive and effective tool in slope protection and soil erosion. At present, the vetiever grass is listed as one of ideal water and soil conservation plants by more than 100 countries. The vetiever grass eco-technology has also been evaluated the most outstanding project of the world 71 items to continue to develop in the technology by the International Appraisal Committee, which receives the tropic, the subtropical area government, the scientist and user highly takes. And the vetiever grass technology has applied at these domains widespread on local hill side water and soil conversation, roadbed slope protection, beach and river bank solid earth as well as pollution management. Previous study of vetiver was focus on ecological management, but far failed to give full play to vetiver of the economic benefits, also increased the cost of management. While the nutritional value of vetiver grass has not received much attention. The morphological characteristics, biological characteristics, physiological resistance and nutritional value evaluation were preliminary investigated on 14 vetiver germplasm materials collected both from home and abroad. The results showed as follows:1. The morphological features of different vitiver grass ecotypes appeared some obvious difference at long natural domestication, and the variation cofficient was very big.The variation cofficient such as diameter of long axis stem and shrot axis stem, leave length, and leave width reached 12.24%, 16.90%, 15.4% and15.3%. However, leave area as well as ratio of length and width reached 4.5% and 6.5%. These characters of different vitiver grass ecotypes will be good material for difrerent usages and enrich resouce on screening for excellent ecotypes.2. Hoffman was the highest, reaching 283 cm, and Wuhua was the shortest , only 168 cm, which was significantly lower than that of others (P <0.05) , the growth pattern followed slow -fast–slow, which were "S" curve of growth changes. And Karnatakthe was creeping growth, different from other ecotypes.3. Nutritional components analysis indicated that there were significant differences in crude protein content, crude fiber content, coarse ash content of 14 vetiver grass ecotypes. The average crude protein content of different vitiver grass ecotypes reached 4.73%, the average crude fiber content reached 36.33%, the average coarse ash content reached 6.37%; The conventional score method showed that the feeding value on Karnataka, Parit buntar, Lilongwe were higher than others, and they can be the ecotype to be applied in Guangdong Province .4. Based on cold stress theory, the indexes of green period electrical conductivity rate, soluble sugar contents and proline contents in leaves were tested on the cold tolerance of 14 ecotypes of vetiver grasses. The results showed that obvious differences of cold resistance existed in each ecotype of vetiver grasses. Ecotypes of Karnataka,Kandy, Monto, Sabak bernam had the excellent ability to resist cold stress, and worthy of be extended.5. Physiological indexes such as water-holding capacity in leaves, electrical conductivity rate, free proline contents and soluble sugar content were determined to evaluate drought tolerance of vetiver grasses. Results showed that obvious differences of drought resistance existed in each ecotype of vetiver grass, the ecotypes material of Lilongwe,Karnataka and Parit buntar had the excellent ability on drought resistance, and worthy of be extended.6. Based on different concentration NaCl solution stress, the indexes of electrical conductivity rate, soluble sugar contents and proline contents in leaves were use to evaluate salt tolerance. The results showed that ecotypes of Kandy, Lilongwe, and Monto had the excellent ability resist salt stress, and worthy of be extended.
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