Vertical variation and storage of soil total nitrogen in long-term fertilizer experiment
LI Shuanglai, HU Cheng, QIAO Yan, CHEN Yunfeng, LIU Guoji, SHI Honglei
Ecology and Environment . 2010, (6): 1334 -1337 .  DOI: 10.16258/j.cnki.1674-5906(2010)06-1334-04

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