Investigation on Helianthus tuberosus L. Growing in Sandy Land of the Eastern China.

Through investigating where Redjuyu was planted by Dalian Redjuyu Desert Control Co. Ltd. We found that there are two parts under ground, one is nutritional root, the other is rhizome. The rhizome grows all alone and it is an important tuber of Helianthus tuberosus L. Expanding part does not happen on the top of the tuber, but in the middle of the rhizome. One piece of rhizome has 1 to 3 expanding parts during its 56 to 80d growing time. The investigated result above had lots of differences between the documents to Helianthus tuberosus L. up to date. This kind of biological character has special significance for intensive managing of Helianthus tuberosus L.