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Spatial-temporal Variation of Mass Fraction of Soil Effective Zinc in Henan Province
Guo Zhenglei,Zhang Shaokai,Li Ling,Yang Suqin,Du Liwei,Zhang Ning and Dong Jing
Chinese Agricultural Science Bulletin . 2015, (32): 137 -141 .  DOI: 10.11924/j.issn.1000-6850.casb15060110