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农学
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农业生产中,为减少由土表蒸发引起的水分无效损失而对土壤表面进行遮盖的过程。
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盖度
植物地上器官(叶、茎、枝及花果)的水平投影面积所占样地面积的比例。又称投影盖度。
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polymeric super-absorbent of water
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