以4个青贮玉米品种(品系)为试验材料,研究了4种种植密度对青贮玉米生物产量和部分农艺性状的影响.结果表明,不同品种之间生物产量差异显著,依次为东青001、东青1号、东青01和阳光1号;不同种植密度间的生物产量存在极显著差异,供试材料的最佳种植密度均为7.143万株/hm²,但品系与密度互作之间差异不显著.种植密度对青贮玉米的株高影响不大,株高的差异主要由品种自身特性决定;随着种植密度的增加青贮玉米的茎粗逐渐减少。

F0ur silage COill varieties were tested in four planting density to studv the variation on biomass production and agricultural characters. The results showed that there was significant difference on hiomass pro-duction among varieties tested and Dongqing001 had the highest hiomass production. There was also significantdifference on hiomass production among different planting densities，and the optimal planting density in thisexperiment was 71 43 thousand plants／ha The difference of nteraction effect between variety and density wasnot significant in this study. The planting density had little effects on the plant height of silage COrn，and the dif-ference of plant height was determined mainly by the variety’S own character. The stelll diameter of test varietiesdecreased gradually with the increase nf planting density.

国家"863"项目(2004AA241160)和哈尔滨市科技攻关计划项目(2004AA9CN136)资助