【摘要】 通过2010年和2011年田间小区试验,测定了不同时间发生的杂草稻对栽培稻株高、茎高(从植株茎部至完全展开顶叶叶枕的距离)、完全展开顶叶叶面积以及分蘖数的影响。两年结果显示:杂草稻与栽培稻共生10d就会对早期栽培稻的生长发育产生抑制作用,说明杂草稻萌发后较栽培稻生长速度快,能很快占有竞争优势,而且随着杂草稻与栽培稻共生时间的延长,杂草稻对栽培稻的抑制作用逐渐上升,杂草稻与栽培稻共生32 d以上,杂草稻对栽培稻株高的抑制率为5.2%～21.2%,茎高抑制率为6.1%～25.3%,完全展开顶叶叶面积抑制率为7.8%～34.5%,分蘖数抑制率为20.0%～69.2%;且栽培稻的完全展开顶叶叶面积、分蘖发生率受杂草稻的竞争抑制较株高、茎高更明显。因此生产上对杂草稻的防治要在早期进行;在水稻与杂草相互关系的研究中,栽培稻的顶叶叶面积、分蘖发生率可能具有更明显的指示作用。更多还原

【Abstract】 Field experiments were conducted to examine the influence of weedy rice germinating at different time on cultivated rice growth and development in 2010 and 2011.The results showed that weedy rice could inhibit the plant height,stem height,flag leaf area and tiller number of cultivated rice at seedling stage after 10 d coexistence,due to the rapid growth after weedy rice germination and consequently competitive advantage.Inhibition of weedy rice on cultivated rice became severer with the prolongation of coexistence,the inhibition on the plant height,stem height,flag leaf area and tiller number of cultivated rice being 5.2%-21.2%,6.1%-25.3%,7.8%-34.5% and 20.0%-69.2% after 32 d coexistence,respectively.The competitive inhibitions of weedy rice on the flag leaf area and tiller number of cultivated rice were severer than those on the plant height and stem height.Flag leaf area and tiller number of cultivated rice could be the indicators in studying the relations of rice and weed.更多还原