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野火烧不尽,春风吹又生。杂草以其顽强的生命力,在大地上生长蔓延,给农业生产带来巨大的危害。大地本身就是野草种子的资源库,据科学家统计,在15厘米土层内,每英亩耕地上(一英亩约为6市亩)有野草种子1,000万颗。相当多的种子虽不萌发,但可长期存活,有的生命力可长达100年。这就是为什么几千年来农民们年复一年地防治杂草但仍不能根除的原因。
Wild fire, in spring. With its tenacious vitality, weeds grow and spread on the earth, bringing great harm to agricultural production. The land itself is a repository of weed seeds, which, according to scientists, contain 10 million weeds of wild grass per acre of arable land (about 6 acres per acre) within a 15 cm layer. Although a considerable number of seeds do not germinate, but long-term survival, and some vitality up to 100 years. That’s why peasants control perennials for years but can not eradicate them year after year.