Study on Absorption and Distribution Property of the Main MineralElements in Wasabi ( Wasabia japonica Matsum) Seedlings Studies on Germination Character of Wasabi (Wasabi japonica) Seeds Studies on Germination Character of Wasabi (Wasabi japonica) Seeds Studies on Optimizing Production of Wasabi Plantlet Studies on Optimizing Production of Wasabi Plantlet Effects of Strength and pH of Nutrient Solution on the Growth and Net Photo-synthetic Rate of Wasabi ( Wasabi japonica Matsum. ) Study on Absorption and Distribution Property of the Main MineralElements in Wasabi ( Wasabia japonica Matsum) Seedlings