Effects of gypsum application rate on the quantity of microorganisms and activity of enzymes in Helianthus annuus rhizospheric
ZHAO Hui, YANG Juan, Teng Yingfeng, Di Xiaojuan
Ecology and Environment . 2010, (11): 2718 -2721 .  DOI: 10.16258/j.cnki.1674-5906(2010)11-2718-04

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