Comparative Study on Density Tolerance of Main Varieties in Southwest Maize Zone

西南玉米区主推品种耐密性比较研究（英文）

This paper conducted a split-plot trial to study the yield,main agronomic characters and density tolerance of 11 maize varieties in southwest maize zone using the density and variety as experimental factors.The results indicated that ① the differences among density,variety and the intersection of density and variety were extremely significant;② Average yield of the tested varieties under high planting density（64 500 plant/hm^2） was significantly higher than that under low-density（49 500plant/hm^2）,and increased 10.37%;③ Four types were selected by the performance of all varieties under high planting density,such as high yield increase with high density,high yield but not increase with high density,low yield increase with high density,low yield but not increase with high density.

采用裂区试验,以密度和品种为试验因子,研究了11个西南玉米区主推玉米品种产量和主要农艺性状,比较不同品种的耐密性。结果表明:1密度间、品种间、密度与品种互作差异均达极显著水平;2参试品种在高种植密度(6.45万株/hm2)下的平均产量显著高于其在低种植密度(4.95万株/hm2)下的产量,增产10.37%;3依据各品种的增密后的表现将品种分为高产增密增产型、高产增密不增产型、低产增密增产型、低产增密不增产型4个类型。