稻茬麦田菵草发生动态及其对小麦生长和产量的影响  

Occurrence dynamics of Bechmannia syzigachne in winter wheat and its influence on growth and production of winter wheat

作　　者：李俊[1] 饶娜[2] 董立尧[1] 张宏军[3] 

机构地区：[1]南京农业大学植物保护学院,江苏南京210095 [2]天津出入境检验检疫局,天津300457 [3]农业部药检所生测室,北京100125

出　　处：《南京农业大学学报》2010年第3期67-70,共4页Journal of Nanjing Agricultural University

基　　金：国家"十五"科技支撑计划项目(2006BAD08A09)

摘　　要：采用田间定点观测法,研究了小麦田菵草的发生动态及其与小麦的竞争关系。结果表明:菵草具有一个冬前出草主峰和一个春后出草次峰;菵草在小麦播后第18周开始进入株高、鲜重的快速增长期,比小麦推迟3周。随着菵草密度的增加,小麦有效穗数、每穗粒数和小麦产量均显著下降,但千粒重变化不明显。小麦产量损失率(Y)与菵草密度(X)之间符合二次曲线方程Y=-0.027X2+2.409X+1.574(r2=0.957)。The occurrence dynamics of Bechmannia syzigachne and its competition with winter wheat were studied in fields.The results showed that B.syzigachne had two main seedling emergence peaks,one in early winter and the other in later spring.A rapid biomass accumulation period of B.syzigachne was observed at 18 weeks after wheat planting,which was three weeks later than that of wheat.Accompanied with the increasing plant density of B.syzigachne in wheat fields,the number of effective panicle,spikelets per panicle and yield of wheats declined significantly,except for thousand-grain weight.The correlation between weed density and percentage wheat yield loss followed：Y=-0.027X2＋2.409X＋1.574,r2=0.957.

关 键 词：菵草 小麦 发生动态 竞争关系影响 

分 类 号：S451[农业科学—植物保护]