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日本草,又名四方藤,属唇形科植物。我国广东、广西等省有分布。福建省莱舟林场1965年从广东引种少量种子,现已安家落户,生长十分旺盛。日本草茎方形,叶对生;花唇形带兰色,无限花序,上部开花,下部种子成熟。茎匐伏地面,不攀缘,不影响林木生长。茎叶含氮量高,每百斤含氮1斤左右。压青作绿肥能使林地土壤疏松,增加肥力。又是较好的青饲料。林地种上日本草,还能起保持水土和控制杂草生长的作用。在管理粗放的情况下,鲜草产量每亩可达1—2千斤。
Japanese grass, also known as Sifang vine, is a Labiatae plants. China’s Guangdong, Guangxi and other provinces have distribution. Laizhou Forest Farm in Fujian Province introduced a small amount of seeds from Guangdong in 1965 and has now settled down in a very prosperous home. Japanese grass stem square, leaves opposite; flower lip with blue, inflorescence inflorescence, the upper flowering, the lower part of the mature seeds. Stalk on the ground, not climbing, does not affect the growth of trees. High nitrogen content of stems and leaves, about 1 kg per kilogram of nitrogen. Green as a green manure can make woodland loose soil, increase fertility. It is better green feed. Woodland planted with Japanese grass, but also play a role in maintaining soil and water and controlling weeds. In the case of extensive management, fresh grass yield up to 1-2 kg per acre.