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Effects of fertilizing regime and planting age on soil calcium decline in Luochuan apple orchards
LI Peng, LI Chun-yue, WANG Yi-quan, JIAO Cai-qiang
Chinese Journal of Applied Ecology . 2017, (5): 1611 -1618 .  DOI: 10.13287/j.1001-9332.201705.022