WEED DIVERSITY AS AFFECTED BY RICE CULTIVATION METHOD

摘要

Weed species diversity is very important factor on the ecologically based weed management for sustainable agriculture in the 21st century. Weed species and diversity is the strongly affected by cultivation method and control method. Weed diversity index of the paddy rice field showed 0.79-0.92 in the non-fertilizer with non-herbicide application and 0.14-0.62 in the fertilizer with herbicide application. Dominant weed species in non fertilizer with non-herbicide application were Scirpus juncoides, Eleocharis congesta, Echinochloa crus-galli, Potamogeton distinctus and Monochoria vaginalis. On the other hand, in herbicide application, Monochoria vaginalis and Sagittaria trifolia showed 44%, 44% on importance value respectively. Rice productivity without using the fertilizer and herbicide was reduced to 22-33% by comparison with conventional method at first year but at the second year reduced by 51-90% of rice productivity