稻虾共作模式对稻田杂草的控制效果及其经济效益

为明确稻虾共作在稻田的应用效果及经济效益,研究了不同稻虾共作模式对稻田杂草的控制作用。结果表明,稻虾共作对田间主要杂草稗(Echinochloa crusgalli)、异型莎草(Cyperus difformis)、鸭舌草(Monochoria vaginalis)、陌上菜(Lindernia procumbens)及水苋菜(Ammannia baccifera)均具有良好的控制作用,防效可达85%以上,总体效果与化学除草处理36%苄嘧磺隆·二氯喹啉酸WP270 g(a.i)/hm~2相当。实施稻虾共作的稻田净收益为68 967.3~88 813.8元/hm~2,显著优于化学除草处理,较其收益增加4.7~6.3倍。

Weed Control Efficacy and Economic Benefits of Rice-lobster Farming in Paddy Rice Fields

To determine the application effect and economic benefit of rice-lobster farming in paddy rice fields,field experi-ments were conducted to evaluate the weed control efficacy of rice-lobster farming,in comparison with chemical control and manual weeding. The results showed that rice-lobster farming had a good control effect on dominant weed species Echinochloa crusgalli,Cyperus difformis, Monochoria vaginalis,Lindernia procumbens and Ammannia baccifera,and all the control efficacies were higher than 85%. The overall effects of rice-lobster farming were equivalent to that of chemical weed control by 53% mefenacet+bensulfuron-methyl WP 397.5 g (a.i)/hm2. The net income of rice-lobster farming was 68967.3~88813.8 yuan/hm2, and significantly higher than that of chemical weed control,the profits increased by 4.7~6.3 times.