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关注：1
2013-05-23 12:21
求翻译：As previously mentioned, earthworms are generally more numerous in grasslands than in arable land. Evidence indicates, however, that earthworm populations do not decline from mechanical damage during tillage operations, but rather from a reduction in the organic matter content of the soil. Repeated row cropping will re是什么意思？ 待解决
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As previously mentioned, earthworms are generally more numerous in grasslands than in arable land. Evidence indicates, however, that earthworm populations do not decline from mechanical damage during tillage operations, but rather from a reduction in the organic matter content of the soil. Repeated row cropping will re
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2013-05-23 12:21:38
如前面提到的，蚯蚓一般比耕地，草原无数。然而，证据表明，蚯蚓种群不下降免耕操作过程中机械损伤，但在土壤中的有机质含量减少，而。重复行的种植将减少蚯蚓的数量，而在轮作和间作草或大田作物纳入对付这种效果。
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2013-05-23 12:23:18
如前所述,蚯蚓一般都是更多比在退耕还林还草的耕地。 但是,证据表明,蚯蚓的数量并没有下降期间免受机械损坏整地作业,而是从一个减少的土壤有机物含量的。 一再行作物收割将蚯蚓的数量减少,而把草或田间作物的间作将计数器的旋转和此效应。
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2013-05-23 12:24:58
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2013-05-23 12:26:38
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2013-05-23 12:28:18
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