Effects of Nitrogen Application Levels and Root Separation on the Root Morphology and Nitrogen Fixation Ability of Alfalfa in the Maize/Alfalfa Intercropping System
WANG Libo, SHAO Zeqiang, LU Wenlong
Journal of Henan Agricultural Sciences . 2021, (1): 44 -51 .  DOI: 10.15933/j.cnki.1004-3268.2021.01.006

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