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A preliminary study on the relationship between soil urease activity and soil fertility in the grazing grasslands of Yongchang county, Gansu province
HOU Yan-hui, ZHOU Xue-hui, JIAO Ting, LIU Rong-tang, LI Xing-fu
Acta Prataculturae Sinica . 2009, (4): 111 -116 . 

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