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用差时播种共培法的改进方法对 1 0 5份水稻、6份巴西陆稻进行了化感作用抗稗草评价。结果表明长匡 7号、P4、Kogyoku、 IR2 731 6、 Milyang 54和巴西陆稻 AJ0 35等材料对无芒稗有较好的化感作用。盆栽研究表明 ,谷梅 2号、中 1 56对无芒稗的抑制作用显著大于对照 ,而化感作用材料 TN1对无芒稗的抑制作用与无化感作用材料秀水 63无显著差异。中 1 56的抑制作用强与其株高有关 ,而谷梅 2号对无芒稗的抑制作用强主要在于其本身的化感作用。随着水稻密度增加 ,无芒稗受抑程度加剧 ,化感作用水稻对稗草根部的抑制似乎要比无化感作用水稻强。 TN1对无芒稗的化感作用不明显 ,可能是由于对不同生态的稗的作用不同之故
An improved method of poor sowing co-culture method was used to evaluate the allelopathic effects of barnyardgrass on 105 rice varieties and 6 Brazilian landraces. The results showed that Changkang 7, P4, Kogyoku, IR2 731 6, Milyang 54 and Brazilian upland AJ0 35 had better allelopathic effects on barnyardgrass. Pot experiments showed that the inhibition effect of barnyardgrass on Gumai No.2 and Zhong156 was significantly greater than that of the control, while the inhibitory effect of the allelopathic material TN1 on barnyardgrass was not significantly different from that on the non-allelopathic material Xiushui 63. The inhibitory effect of 1 56 on its plant height, Gumai 2 on the barnyardgrass inhibition mainly lies in its own allelopathy. With the increase of rice density, the inhibition of Echinochloa crus-galli intensified, and the inhibition of allelopathic rice on the roots of Echinochloa crusgalli appeared to be stronger than that of rice without the allelopathic effect. The allelopathic effect of TN1 on barnyardgrass was insignificant, probably due to the different effects of barnyardgrass on different ecosystems