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The effect of earthworms on leachate volume and leachate N losses was investigated in a rice–wheat rotation agroecosystem over the wheat growing season. Corn residues (<2 cm) were added to field microcosms as either mulch or incorporated into the soil. Earthworms were added to half of the microcosms at a population density and age structure simulating a natural earthworm population. With earthworms...
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