水层深度对稻田杂草化除效果及水稻生长的影响

以汕优63、武育粳3号水稻品种及稗草、异型莎草和鳢肠杂草为试验材料,采用乙草胺和苄·乙·甲2个除草剂品种各2种剂量、3个水层深度对试验材料进行处理,分析水层深度对稻田杂草化除效果及水稻生长的影响。结果表明:施用上述2个除草剂及参试剂量,在4cm水层和12cm水层时能有效提高对稗草、异型莎草和鳢肠的防除效果;施用除草剂后,对水稻的株高和地上部生长会产生不同程度的抑制作用,其中12cm水层处理抑制最大,4cm水层处理次之,0cm水层处理抑制最轻;在抑制水稻顶端生长的同时,水稻茎蘖数有一定增加。综合除草效果和对水稻生长的影响,4cm水层处理的水稻产量最高,优于0cm和12cm水层处理。本文还分析了水层深度×剂量×除草剂品种在抑制不同水稻品种营养生长方面的差异。

Effects of Water Depths on the Growth of Rice and Chemical Weed Control Efficacy in Paddy Fields

Studies on effects of different water depths on the growth of rice and chemical weed control efficacy in paddy fields were conducted.The materials taken in the trials were two rice cultivars(japonica rice Wuyujing 3,hybrid rice Shanyou 63)and three weeds(Echinochloa crus-galli L.,Cyperus difformis L.,Eclipta prostrata L.).The materials in the trials were treated with two herbicides(Acetochlor and MAMB)at three different dosages and three water depths(0,4 and 12 cm).The results indicated that more weeds were controlled by the herbicides at the water depth of 4 cm than at the water depth of 0 cm.The growth of rice seedlings was remarkably suppressed as water depth increased after applying herbicides,but the number of tillers of rice was increased.The yield of rice was highest at the water depth of 4 cm among all the treatments.The differences between the two rice cultivars in growth inhibition by interactions of water depths,dosages and herbicides have been discussed in this paper.