[ Objective ] The purpose was to study the yield of three different types of maize hybrids under different population densities in order to determine the suitable reference density of different types of maize hybrids in Tieling Area. [ Method] Two-faetor split-plot design was used with 3 repeated, line length 8.0 m, 8-line area, line width 0. 6 m. Factors species was the based district, A; : Iianyu 16 (flat type varieties) , A2;Danyu 39 (transitional species), A3: Zhengden 958 (compact varieties). Factor density was deputy district, B,: 3.298 4 X 10" plants/ha, each row 16 plants, B2: 3. 898 0 x 104 plants/ha, each row 19 plants, B3: 4.797 7 x 10" plants/ha, each row 24 plants, B4: 5. 697 2xlO4 plants/ha, each row 28 plants, Bs; 6.746 7 x W' plants/ha, each row 33 plants, B6: 7.496 3 x 10* plants/ha, each row 37 plants. Harvesting the middle 4 lines to calculate yield, three repeated were all harvested and uniformly threshed. [ Result ] The differences of yield among varieties, densities and growth years reached a significant level, and that of the species x density interaction was also significant, while that of variety X year interaction and density X year interaction did not reach significant level. Yield and its components and effects of density on yield showed that yield was higher under middle and high density, and too high density and too low density were both not in favour of increasing yield. [ Conclusion ] In Tieling Area, the suitable density of Iianyu 16, Danyu 39 and Zhengdan 958 is 4. 797 7 x 104 plants/ha almost, 5.697 2 x 10* -6.746 7 x 104 plants/ha.%[目的]研究不同种植密度下3种不同类型玉米(Zea mays L.)杂交种的产量,从而确定不同株型玉米杂交种在铁岭地区的适宜种植密度.[方法]试验采用2因素裂区设计,小区行长8.0mζ8行区,行宽0.6m,3次重复.A因素品种为主区,A1:连玉16(平展型品种)、A2:丹玉39(过渡性品种)、A3:郑单958(紧凑型品种).B因素密度为副区,B1:3.2984万株/hm2、每行种植16棵,B2:3.898 0万株/hm2、每行种植19棵,B3:4.797 7万株/hm2、每行种植24棵,B4:5.697 2万株/hm2、每行种植28棵,Bs:6.746 7万株/hm2、每行种植33棵,B6:7.496 3万株/hm2、每行种植37棵.试验测产收中间4行,3次重复全部收回,统一脱粒.[结果]产量在品种间、密度间和年份间的差异达到极显著水平,并且品种×密度互作亦达到显著水平,而品种×年份互作和密度×年份互作未达到显著水平.综合产量及产量构成因素和密度对产量的影响表现为中高密度下的产量水平较高,密度过高或过低都不利于产量的提高.[结论]不同株型玉米杂交种在铁岭地区的适宜种植密度,连玉16为4.797 7万株/hm2左右,丹玉39和郑单958均为5.697 2万～6.7467万株/hm2.
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