Effects of Increasing Application of Ammonium Nitrogen on Root System Characteristics and Nutrients Utilization of Pakchoi under Substrate Cultivation in Northern China in Winter
GONG Hua-rui，LUO Hong-yi，QI Yan-yan，PANG Xiao-yan，WANG Xu-peng，LI Guo-hui
China Vegetables . 2018, (12): 33 -39 . 

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