Development of a handy seed-harvester of useful wild grasses for re-vegetation.

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It is very important to use native grass for fodder crop or re-vegetation because of problems of invading species of commercial based seeds of pasture grass. Escaped pasture grass had been invaded to various ecosystems and they negatively changed bio-diversity. Then, many ecologists recommend use of native grass for artificial grassland. But, there are some problems for using native grass such as difficulty of seed harvest and difficulty of seed storage. Seed harvest of Japanese native grass is very difficult because of small seed with pappus. We can not use common seed-harvester for native grass. And, it is very difficult to adjust the all seed of native grass to artificial condition because there are many genetic variations in only one population. So, we tried to exploit seed harvester for native grass.We exploited the seed-harvester by change of engine weed cutter. There are some problems for seed germination because of rough collecting at high power. We must solve this problem for using native grass by seed propagation.Seeds of native grass can't maintain for long time in room condition. It is a large problem for re-vegetation. We found air moisture decrease longevity of seed in Imperata cylindrica. It is possible to maintain vigor of seeds for over two years by using desiccant.