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Effects of purified humic acid on the growth and nitrogen metabolism of cucumber seedlings under nitrogen stress.
GU Duan-yin, WANG Xiu-feng, GAO Jun-jie, JIAO Juan, LIU Zhong-liang, ZHANG Yan-yan
Chinese Journal of Applied Ecology . 2018, (8): 2575 -2582 .  DOI: 10.13287/j.1001-9332.201808.029