2002年在吉林省梨树,以中单9409、郑单18和哲单14为试材,在30 000、60000、90000和120 000株/hm2种植密度下,研究了种植密度对3个玉米品种产量及子粒品质的影响.结果表明,3个品种产量的种植密度效应基本相同,产量随种植密度增加先升后降.随种植密度增加,高淀粉玉米郑单18的蛋白质含量和油分含量逐渐下降,淀粉含量上升,而蛋白质、油分、淀粉含量之和(POSC)呈现升-降-升的变化趋势.普通玉米哲单14蛋白质含量和POSC随种植密度增加而上升,淀粉含量下降,而油分含量呈现降-升-升趋势.优质蛋白玉米中单9409随种植密度增加POSC和油分含量呈下降趋势,而蛋白质含量和淀粉含量变化较为复杂.以上表明,玉米子粒养分含量在不同种植密度时品种间具有很大的差异。

The effects of plant population on the grain yield and quality-of three hybrids(zhogdan 9409，zheng- danl8 and zhedanl4)were studied under 30 000，60 000，90 000，120 000 plants／ha in northeast of China，Jilin province in 2002. The results showed that the effects of plant population on the grain yield were ahnost the same to all the three bybrids. The grain yield increased first and then decreased with the add of the plant population For the bybrid of zhengdan 18(whieh was high starch corn}，the grain protein contents and oil contents decreased and starch contents increased gradually with the add of plant population，the POSC which presented the total contents of pro-rein．oil and starch of grain showed a curve of up-down-up with the add of the plant population For the bybrid of zhedan 14(which was normal corn)，the grain protein contents and POSC increased，starch contents decreased andthe oil contents showed down-up-up with the increase of plant population. For the bybrid of Zhongdan9409(hichwas quality-protein maize)，the grain oil contents and POSC decreased，the protein contents and starch contents pre-sented a complicated curve with the add of plant population. It is suggested that the effects of plant population on thegrain nutrition component varied by corn bybrids

本研究受国家科技十五攻关项目2001BA50CA和农业结构调整重大技术研究专项(04-03-05A)资助