TY - Journal of Geographical Sciences A1 - WANG Tao, LU Changhe, YU Bohua T1 - Production potential and yield gaps of summer maize in the Beijing-Tianjin-Hebei Region Y1 - 2011-08-05 09:23:42.727 JF - Journal of Geographical Sciences JO - Journal of Geographical Sciences SP - 677 EP - 688 VL - 21 IS - 4 UR - {https://www.geogsci.com/EN/10.1007/s11442-011-0872-3} N1 - 10.1007/s11442-011-0872-3 ER -