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一、然巴及其危害我区农作物除受野燕麦等一年生杂草危害之外,其次是受宿根性杂草—然巴等的危害。然巴为藏语,实为白茅,有的叫茅草、白草(lmperata cylimdlrical.)属禾本科狼尾草属。是一种再生能力很强的宿根性杂草,它通过地下根茎伸长蔓延,根茎节上的芽有的向上生成茎杆,抽穗开花,不结实,有的芽生出新的根茎,从田埂、渠边向农田侵袭,逐渐蔓延至全田。然巴多的田块,一平方米地中根总长度达58.1米,芽数3253个.地下茎多分布在30厘米以上的土层中,以5—20厘米最多,占70%.这正是作物根辟的
First, while Pakistan and its damage to crops in our region except by wild oats and other annual weeds hazards, followed by the perennial weeds - Ran and other hazards. However, Pakistan is Tibetan, in fact, Imperata cylindrica, and some called thatch, white grass (lmperata cylimdlrical.) Is a grass Pennisetum. It is a kind of perennial weed with strong regenerative ability. It grows and spreads through the underground rhizomes. The buds on the rhizome section generate stems upwards, heading and flowering, not strong, and some buds give birth to new rhizomes. Drainage edge to the farmland invasion, gradually spread to the whole field. However, the fields of Bardo, a square meter of the total length of 58.1 meters in the root, the number of buds 3253. Underground stems distributed in more than 30 cm soil layer to 5-20 cm, accounting for up to 70%. This is the crop Roots of the