植物界的互惠共生(1/2)
概述：某些对养分、土壤和水分有相似需求并兼容的植物可以一起互利生长。Hints:
nitrogen
文中有两处连字符
校对：赤壁小鬼头
翻译&注解：pussbb
组长：olivertt
答疑：994116450a
发音点评：Mornight
本期材料发音模仿地址：http://bulo.hujiang.com/menu/11885/item/742975/http://t1.g.hjfile.cn/listen/201303/20130314093855982161.mp3Companion planting is the idea that some kinds of plants can help each other grow. Plants that are compatible together generally have similar needs in terms of nutrients, soil and moisture levels.
Advice about which plants are compatible is sometimes based more on tradition than proof. But experts say there is evidence to support certain combinations. These can improve harvests, reduce disease and help with pest control by attracting helpful insects.
For example, some kinds of soil bacteria take nitrogen from the air and make it into a form that plants can use. The plants hold the nitrogen in their roots. Legumes are especially good at this nitrogen-fixing. Then any crops that share the same space as the legumes can get the nitrogen as the roots decompose.
Beans and potatoes can also share territory well because their roots reach different levels in the soil. Deep-rooted vegetables get nutrients and moisture from lower down in the soil, so they do not compete with plants with shallower roots.套种这一理念是指某些种类的植物种在一起时互利生长。这些适合一起种植的植物对营养、土壤和湿度的需求大致相同。
关于哪些植物适合一起种植，这些建议有时并没有证据，而是根据传统得来的。但是专家称，有些组合是有依据的。这些组合可以提高收成，减少疾病，还有助于通过吸引益虫来控制虫害。
例如说，某些种类的土壤细菌吸收空气中的氮气，并把它转化成植物可利用的形式。植物把氮存在根内。豆科植物尤其擅长固定氮元素。这样，和豆类植物套种的任何作物都能随着豆类植物根的腐烂获得氮。
菜豆和马铃薯种在一片地上也很好，因为它们的根所到达的土壤深度不同。扎根深的蔬菜从土壤较深处获得营养和水分，所以它们不会和扎根较浅的植物争夺。
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