不同株型水稻对无芒稗的生态控制研究  

Ecological Control of Barnyardgrass by Different Morphological Type Rice

作　　者：徐正浩[1] 余柳青[1] 

机构地区：[1]中国水稻研究所,浙江杭州310006

出　　处：《中国水稻科学》2000年第2期125-128,共4页Chinese Journal of Rice Science

摘　　要：以不同株型的水稻品种 (组合 )为材料研究了混栽其中的无芒稗 [Echinochloacrusgalli(L .)Beauv.var.mitis(Pursh)Peterm .]的生长状况。高秆大冠层株型水稻品种Ⅱ优 2 0 70显著降低移栽稻田无芒稗株高、叶面积指数、植株干物质、分蘖数、穗长和穗粒数。水稻对无芒稗的竞争力 ,以高秆大冠层株型最强 ,中秆中冠层株型次之 ,矮秆小冠层株型最弱。在无芒稗 5 0株 /m2 干扰下 ,高秆大冠层株型水稻各产量因子下降不明显 ,而矮秆小冠层株型粳糯稻各产量因子显著下降 ,平均减产 40 %The growth character of barnyardgrass [Echinochloa crusgalli (L.) Beauv. var. mitis (Pursh) Peterm.] in mixture transplanting with different morphological type rice varieties (combinations) were studied. The hybrid rice combination Ⅱ you 2070 with the plant morphological type of long stalked and great canopy (LSGC) reduced the plant height, leaf area index, plant dry weight, panicle length, tiller number and spikelets per panicle of barnyardgrass significantly in the transplanted rice. The competitive ability of LSGC with barnyardgrass was more powerful compared with the plant morphological type of middle stalked and medium canopy (MSMC) and the plant morphological type of short stalked and small canopy(SSSC). The yield components of indica hybrid rice with LSGC was no decrease markedly under barnyardgrass interference of 50 plants per square meter. However, the yield components of japonica rice with SSSC declined seriously resulting in 40 percent loss of grain yield.

关 键 词：水稻 株型 无芒稗 生物竞争 杂草防治 生物防治 

分 类 号：S511.101[农业科学—作物学]