TY - Acta Agronomica Sinica A1 - QIAN Chun-Rong1,3,YU Yang3,GONG Xiu-Jie,JIANG Yu-Bo,ZHAO Yang,WANG Jun-He,YANG Zhong-Liang,ZHANG Wei-Jian T1 - Response of Grain Yield to Plant Density and Nitrogen Application Rate for Maize Hybrids Released from Different Eras in Heilongjiang Province Y1 - 2012-10-12 JF - Acta Agronomica Sinica JO - Acta Agronomica Sinica SP - 1864 EP - 1874 VL - 38 IS - 10 UR - https://zwxb.chinacrops.org N1 - 10.3724/SP.J.1006.2012.01864 ER -