以6个青贮玉米品种为材料，研究了不同收获时期不同器官粗灰分与无氮浸出物含量与积累量变化。结果表明，随着收获期推迟粗灰分与无氮浸出物含量与积累量基本为递增趋势。粗灰分与无氮浸出物在植株器官中的分配因品种与收获期而异。8月11日收获，无氮浸出物含量在茎鞘中含量较高，绿叶和果穗中均较低。8月26日与9月12日收获果穗和茎鞘中含量均较高且显著高于在绿叶中的含量。呼和浩特地区青贮玉米适宜收获期应在乳熟中后期，此期收获营养物质积累量高，可消化养分多，木质素含量低，植株含水率低，有利于高质量青贮。

With 6 silage corn varieties used as materials, studied the change of content and accumulation in crude ash and nitrogen free extract of different harvest time and different organ. The results showed that content and accumulation in crude ash and nitrogen free extract was increasing when harvest time delayed. Distribution of crude ash and nitrogen free extract was different with harvest time and different organ. Content of nitrogen free extract was high in stem, low in leaf and spike on august 11 harvests, content in spike and stem was higher than leaf on august 26 and september 12 harvests. The best harvesting period is late milk stage in Hohhot. In this time the nutrient accumulation is high, more digestible nutrients, the lignin and water content in plants was low, is favor of high quality silage.

内蒙古自治区呼和浩特市科技攻关计划项目“呼和浩特市优质饲用作物种植与加工利用技术研究及产业化开发”(2003-1-农社-07)