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Towards the production of allelopathic cultivars for low input rice farming systems

机译：朝向低投入水稻农业系统化梳理品种的生产

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The allelopathic effects of 357 accessions or cultivars of rice (Oryza saliva L.) on awn-less barnyard grass (Echinochloa colona (L.) Link.) were evaluated using a Petri dish test, then with small umbrella sedge (Cyperus difformis L.) and barnyard grass (Echinochloa crus-galli (L.) P.Beauv.) in a field trial. These experiments were conducted as part of a broader attempt to evaluate the suitability of ancient accessions of rice as donors of allelopathic traits to modern rice to produce new rice cultivars with weed suppressing ability. Such traits would be highly desirable in Southeast and Southern Asia where herbicide cost restricts their use. The Petri dish test used a 'relay seeding technique', in which awnless barnyard grass seeds were planted next to 7-day old rice seedlings and the two grown together for 10 further days. There were 14 rice accessions or cultivars (3%) that significantly reduced the root and in most cases, the shoot growth of the weed and hence exhibited allelopathic effects. Afield experiment conducted in Cambodia during 1999/2000 wet season was undertaken to determine the weed-suppressing ability of six of these 14 rice accessions or cultivars against awnless barnyard grass and small umbrella sedge. All showed significant reductions in shoot biomass. The effect of the soil-incorporated residues from these rice accessions or cultivars was also studied on the establishment of awnless barnyard grass and rice plants in the following season. The incorporation of residues was found to be suppressive towards the early growth and establishment of awnless barnyard grass.
机译：使用培养皿试验评估了357种含水稻（Oryza Saliva L.）（Echinochloa Colona（L.）链路）的稻米（Oryza Saliva L.）的化发效果。然后用小伞莎草（Cypetus Difformis L. ）和稗草（Echinochloa crus-galli（l.）p.beauv。）在田间试验中。这些实验是在更广泛的尝试中评估米饭作为荧光抑制能力的新型水稻供捐赠者的适用性，以评估古代牧草的适用性的一部分。这些特征将在东南和南亚非常可取的是，除草剂成本限制了他们的使用。培养皿测试用了一个“继电器播种技术”，其中旁边的7天老幼苗旁边种植了真正的稗草种子，两天的两天一起种植了10天。有14种米饭或品种（3％）（3％）显着降低了根系，在大多数情况下，杂草的枝叶生长表现出了化感作用。在1999/2000次湿季期间，在柬埔寨进行的远见实验，以确定这14种米饭或品种的杂草抑制能力，反对真正的稗草和小伞莎草。均显示出射击生物质的显着减少。还研究了土壤掺入残留物的影响，在接下来的季节建立了真正的稗草和水稻植物。发现残留物的掺入抑制了早期生长和建立真正的稗草。

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