Effects of Different Ammonium and Nitrate Ratios on Lettuce Growth and Accumulation of Plant Nitrogen，Phosphorus and Potassium
LEI Yu-ling，CHEN Zi-yan，SONG Shi-wei*，CHEN Ri-yuan，LIU Hou-cheng，SUN Guang-wen
中国蔬菜 . 2015, (9): 48 . 

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