【摘要】 调查表明 ,温州农区水稻旱育秧田常见杂草有 31种 ,稗草和马唐是优势种群 ,杂草群落因早晚稻及地域、土质差异不甚相同。稗草出苗最早 ,播后 6～ 10d(早稻 )或 6d(晚稻 )出现高峰 ;马唐出苗较迟 ,高峰在播后 12～ 2 0d(早稻 )或 6～ 10d(晚稻 )出现 ;野苋菜和碎米莎草出苗最迟。早稻旱育秧田有 2个总草出苗高峰 ,分别为播后 10～ 12d和 16～ 2 0d ,稗草长叶速度快于水稻 ,最终植株高于水稻 ;晚稻旱育秧田仅出现 1个总草出苗高峰 ,即播后 6～ 10d ,稗草与水稻同步生长 ,稗草植株不超过水稻。农思它和龙杀防除旱育秧田稗草和马唐效果较好 ,并且对水稻安全 ;丁草胺对稗草和马唐及阔叶草也有较好防除效果 ,但对秧苗安全性差 ,不宜使用。更多还原

【Abstract】 Results of our survey showed there appear 31 species of weeds in arid rice nursery fields,In Wenzhou, Zhejiang, among which Echinochloa crusgalli, and Digitaria sanguinalis are dominant, and weed communities differ between early or late rice, regions and soils. In the fields E. crusgalli germinates first with a peak at 6-10 d after early rice seeded or 5-6 d after late rice seeded, D. sanguinalis emerges quite late with a peak at 10-20 d for early rice or 6-9 d for late rice, and Amaranthus blitum and Cyperus iria germinate last. In early arid rice nurseries, weeds appear in 2 peaks at 10-12 d and 17-19 d after rice seeded, and barnyardgrass grows quicker than rice with bigger plants. However in late arid rice nurseries, there is only one peak of weed emergence at 6-9 d after rice seeded, and barnyardgrass has similar growth speed.Field trials for weed control showed oxadiazon and a mixture of thiobencarb+bensulfuron methyl are highly effective on weeds and safe to rice. Butachlor is not suggested for weed control in arid rice nurseries due to the damage to rice seedling, although it also has good efficacy on weeds.更多还原