Effect of Planting Years on Soil pH and Nutrient Accumulation in Greenhouse Vegetable Fields
CAO Wen-chao1，2，ZHANG Yun-long1，2，YAN Zheng-juan2，WANG Jing-guo2，LI Jun-liang1，CHEN Qing2*
中国蔬菜 . 2012, (18): 134 -141 . 

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