TY - Acta Agronomica Sinica A1 - YU Huan,WU Hua-Song,WANG Zhi-Jie T1 - Evaluation of SPAD and Dualex for In-Season Corn Nitrogen Status Estimation Y1 - 2010-05-12 JF - Acta Agronomica Sinica JO - Acta Agronomica Sinica SP - 840 EP - 847 VL - 36 IS - 05 UR - https://zwxb.chinacrops.org N1 - 10.3724/SP.J.1006.2010.00840 ER -