Jia Yu, Xu Bing-cheng, Li Feng-min, Wang Xiao-ling.2006. Availability and contributions of soil phosphorus to forage production of seeded alfalfa in semiarid Loess Plateau. Acta Ecologica Sinica, in press.
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贾宇;徐炳成;李凤民;王晓凌.;2006
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