摘要： 连续3个年度的杂种小麦分蘖发生、成穗规律研究结果表明，化杀（CHA）杂种小麦分蘖发生早，着生次生根多，长势强，干物质积累快，蘖质系数高，分蘖与主茎的差距小，成穗相对较整齐，穗粒重高，为降低密度，利用分蘖成穗奠定了基础；播期、密度、供水等影响分蘖的生长，但主要是高级位分蘖的差异；随播期推迟，密度增加，杂种优势降低，但稀播（90万苗/hm2以下）和早播（9月25日）时主茎或Ⅰ蘖成穗率受到影响；在适期早播情况下，90～210万苗/hm2可以获得较好结果。春季早浇起身水可促进高位一级蘖和晚生二级蘖的生长，但群体质量降低，“前控”管理可使群体稳健发展，省水，节能，高产，稳产。

关键词: 杂种小麦, 分蘖, 成穗, 农艺因子, 效应

Abstract: The results of three years successive studies indicated that hybrid wheat treated with chemical hybridizing agent was characterized by its earlier development，more root number and more drymatter accumulation of tillers，which minimized the difference between them ainstem and the tillers，and there fore could lay a foundation for reducing plant density.Agronomic factors，sach as planting date，plant density，irrigation etc.，affected the growth and development of tillers.The heterosis decreased with the delay of planting date and the increase of plant density.Generally，satisfactory results could be obtained from 90-210 preliminary shoots per square meters under suitable planting date.The growth of high-position tillers were promoted by early irrigation in spring，but their population quality was deteriorated.It was recommended that first irrigation should be deferred to the elongation stage.

Key words: Hybrid wheat, Tillering, Ear-bearing, Agronomic factors, Effects

中图分类号: 

• S512.1