Deep application of controlled-release urea increases the yield and saponin content of Panax notoginseng by regulating soil nitrate distribution by Yun-xia Su, Yun-xia Su, Yun-xia Su, Ping Zhao, Li-jie Jia, Li-jie Jia, Li-jie Jia, Yuan-feng Cao, Guan-ze Liu, Guan-ze Liu, Jun-wen Chen, Jun-wen Chen, Sheng-chao Yang, Sheng-chao Yang, Yan-li Zhou, Guang-qiang Long, Guang-qiang Long, Guang-qiang Long

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