不同水层和密度条件下化感作用水稻对无芒稗的干扰控制作用

不同水层下水稻对无芒稗的干扰控制作用研究表明，水稻化感作用品种吓一跳、谷梅2号和中156对无芒稗的株高抑制作用比无化感作用品种秀水63和春江11呈显著性差异．随盆栽水稻密度增加，水稻对无芒稗的干扰控制作用加大．在每盆4株栽植密度下，水稻化感作用品种鸡早籼、谷梅2号显著抑制无芒稗植株株高；在每盆32株密度时，水稻化感作用品种吓一跳、PI312777、TN1等对受控无芒稗的干扰控制与无化感作用品种春江11相比，呈显著性水平．

Interference of allelopathic rice cultivars on barnyardgrass under different water irrigation and rice plant density

Pot culture experiments were conducted to examine the effects of water irrigation and rice plant density on the interference of allelopathic rice on barnyardgrass (Echinochloa crus-galli).The results showed that under water irrigations,allelopathic rice cultivars Xiayitiao,Gumei 2 and Zhong 156 significantly reduced the plant height of barnyardgrass than non-allelopathic rice cultivars Xiushui 63 and Chunjiang 11.Barnyardgrass plants grew shorter as rice plant density increased.Allelopathic rice cultivars Jizaoxian and Gumei 2 interfered with barnyardgrass,even at their densities as low as 4 plants per pot,and the interference reduced plant height of barnyardgrass significantly compared with the non-rice control.Allelopathic rice cultivars Xiayitiao,Jizaoxian,PI312777,TN1,Gumei 2 and Zhong 156 at 32 rice plants per pot inhibited the growth of barnyardgrass significantly than Chunjiang 11.