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We investigated the effects of interaction between plastic-film mulch and nitrogen (N) fertilization rate on the fate of fertilizer N in a ridge–furrow maize (Zea mays L.) cropping system. Three N levels (0, 138 and 207 kg ha−1, abbreviated as N0, N1 and N2) were combined with plastic-film-mulching and no-mulching, successively in 2015 and 2016, at a cold semiarid site. Within each treated plot, a...
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