Fertilization Status of Open Vegetable Fields in Outskirts of Beijing and Studies on Interannual Changes of Soil Available Nutrients
WEN Fang-fang，JIA Xiao-hong，LIAO Hong，WANG Sheng-tao，YU Yue-yue，LIANG Jin-feng，LI Xu-jun，LIU Zi-fei
China Vegetables . 2015, (10): 63 -67 . 

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