Studies were carried out for two years to evaluate the effect of methods of sowing and weed control practices on the productivity of transplanted and direct wet-seeded rice in Dera Ismail Khan, NWFP, Pakistan. The exp...Studies were carried out for two years to evaluate the effect of methods of sowing and weed control practices on the productivity of transplanted and direct wet-seeded rice in Dera Ismail Khan, NWFP, Pakistan. The experiment was laid out in a randomized complete block design with a split plot arrangement. The planting techniques viz. transplanting and direct seeding were maintained in main plots while weed control practices included the use of granular herbicide Sunstar 15WG （ethoxy sulfuron）, Machete 60EC （butachlor）, conventional hand weeding, and the weedy check （control） were assigned to the sub-plots. Data were recorded on weed parameters like weed density and dry weed biomass 60 and 90 days after sowing （DAS）; agronomic parameters including plant population, number of panicles and paddy yield and physiological parameters like leaf area index and net assimilation rate 45 and 90 DAS. The planting methods and weed management significantly influenced most of the parameters studied. The data revealed that the paddy yield and its components were significantly higher in the transplanted method than that in direct-seeded method, while the weed density and biomass were lower in the transplanted plots than the direct-seeded plots. Among weed management tools, the maximum paddy yield was obtained in hand weeding, closely followed by herbicide application Machete 60EC during both cropping seasons.展开更多
通过田间药效试验,筛选对移栽稻田杂草具有较好防效的除草剂,为科学、安全、高效应用除草剂提供依据。结果表明,750 g a.i./hm^240%五氟·丁草胺悬浮剂+67.50 g a.i./hm^230%苄嘧磺隆可湿性粉剂或525 g a.i./hm^2500 g/L丙草胺乳油+...通过田间药效试验,筛选对移栽稻田杂草具有较好防效的除草剂,为科学、安全、高效应用除草剂提供依据。结果表明,750 g a.i./hm^240%五氟·丁草胺悬浮剂+67.50 g a.i./hm^230%苄嘧磺隆可湿性粉剂或525 g a.i./hm^2500 g/L丙草胺乳油+67.50 g a.i./hm^230%苄嘧磺隆可湿性粉剂可用于移栽稻田土壤封闭处理,其对一年生杂草的株防效分别为83.90%、76.19%,鲜质量防效分别为94.29%、86.31%。针对以稗草发生危害为主的田块,可用90 g a.i./hm^210%精·氰氟乳油、1620 g a.i./hm^290%禾草丹乳油、24 g a.i./hm^225 g/L五氟磺草胺可分散油悬浮剂或120 g a.i./hm^2100 g/L唑酰草胺乳油+90 g a.i./hm^210%氰氟草酯乳油在苗后对茎叶进行喷雾处理,其株防效和鲜质量防效均在96%以上。展开更多
【目的】通过水稻移栽前土壤封闭处理和移栽后茎叶喷雾处理,筛选对移栽稻田杂草具有较好防效的除草剂,为安全高效应用除草剂提供依据。【方法】采用随机区组的方法,定点取样调查各处理小区的杂草株数、鲜重,评价供试药剂对杂草防除效果...【目的】通过水稻移栽前土壤封闭处理和移栽后茎叶喷雾处理,筛选对移栽稻田杂草具有较好防效的除草剂,为安全高效应用除草剂提供依据。【方法】采用随机区组的方法,定点取样调查各处理小区的杂草株数、鲜重,评价供试药剂对杂草防除效果及对移栽水稻安全性。【结果】40%五氟·丁草胺悬浮剂750 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm^2、500 g/L丙草胺乳油525 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm^2和60%丁草胺乳油1 260 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm^2在水稻移栽前进行土壤封闭处理,20 d后施用25 g/L五氟磺草胺可分散油悬浮剂30 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂45 g a.i./hm^2进行茎叶喷雾处理,对移栽稻田一年生杂草的株防效均在89%以上,鲜重防效在97%以上。仅施用3%氯氟吡啶酯乳油36 g a.i./hm^2进行茎叶喷雾处理,药后45 d对稗草和空心莲子草的防效达到100%,对移栽稻田一年生杂草的株防效和鲜重防效均在91%以上。【结论】针对稻田扁秆藨草、稗草和空心莲子草危害为主的田块,可选用500 g/L丙草胺乳油或40%五氟·丁草胺悬浮剂或60%丁草胺乳油与30%苄嘧磺隆可湿性粉剂混配进行土壤处理,且20 d后选用25 g/L五氟磺草胺可分散油悬浮剂+30%苄嘧磺隆可湿性粉剂进行茎叶喷雾处理。若不进行土壤封闭处理的田块,针对稗草和空心莲子草危害为主的田块,可选用3%氯氟吡啶酯乳油进行茎叶喷雾防除。展开更多
为有效控制福建地区直播稻田禾本科杂草的危害，以莆田市仙游县游洋乡的水稻种植基地为试验点，选择测定1％噁嗪草酮悬浮剂、10％双草醚悬浮剂和20％氰氟草酯油悬浮剂等3种除草剂对稗草、千金子等禾本科杂草的防治效果，筛选确定最佳除...为有效控制福建地区直播稻田禾本科杂草的危害，以莆田市仙游县游洋乡的水稻种植基地为试验点，选择测定1％噁嗪草酮悬浮剂、10％双草醚悬浮剂和20％氰氟草酯油悬浮剂等3种除草剂对稗草、千金子等禾本科杂草的防治效果，筛选确定最佳除草剂及其理想的田间使用浓度。结果表明：20％氰氟草酯油悬浮剂是防治直播稻田中稗草、千金子等禾本科杂草最佳的除草剂，田间推荐使用浓度为45～105 g · hm^ －2（有效成分）兑水675 L · hm ^－2，药后30 d防治效果达均可80.00％以上，无药害产生，对水稻安全。展开更多
文摘Studies were carried out for two years to evaluate the effect of methods of sowing and weed control practices on the productivity of transplanted and direct wet-seeded rice in Dera Ismail Khan, NWFP, Pakistan. The experiment was laid out in a randomized complete block design with a split plot arrangement. The planting techniques viz. transplanting and direct seeding were maintained in main plots while weed control practices included the use of granular herbicide Sunstar 15WG （ethoxy sulfuron）, Machete 60EC （butachlor）, conventional hand weeding, and the weedy check （control） were assigned to the sub-plots. Data were recorded on weed parameters like weed density and dry weed biomass 60 and 90 days after sowing （DAS）; agronomic parameters including plant population, number of panicles and paddy yield and physiological parameters like leaf area index and net assimilation rate 45 and 90 DAS. The planting methods and weed management significantly influenced most of the parameters studied. The data revealed that the paddy yield and its components were significantly higher in the transplanted method than that in direct-seeded method, while the weed density and biomass were lower in the transplanted plots than the direct-seeded plots. Among weed management tools, the maximum paddy yield was obtained in hand weeding, closely followed by herbicide application Machete 60EC during both cropping seasons.
文摘通过田间药效试验,筛选对移栽稻田杂草具有较好防效的除草剂,为科学、安全、高效应用除草剂提供依据。结果表明,750 g a.i./hm^240%五氟·丁草胺悬浮剂+67.50 g a.i./hm^230%苄嘧磺隆可湿性粉剂或525 g a.i./hm^2500 g/L丙草胺乳油+67.50 g a.i./hm^230%苄嘧磺隆可湿性粉剂可用于移栽稻田土壤封闭处理,其对一年生杂草的株防效分别为83.90%、76.19%,鲜质量防效分别为94.29%、86.31%。针对以稗草发生危害为主的田块,可用90 g a.i./hm^210%精·氰氟乳油、1620 g a.i./hm^290%禾草丹乳油、24 g a.i./hm^225 g/L五氟磺草胺可分散油悬浮剂或120 g a.i./hm^2100 g/L唑酰草胺乳油+90 g a.i./hm^210%氰氟草酯乳油在苗后对茎叶进行喷雾处理,其株防效和鲜质量防效均在96%以上。
文摘【目的】通过水稻移栽前土壤封闭处理和移栽后茎叶喷雾处理,筛选对移栽稻田杂草具有较好防效的除草剂,为安全高效应用除草剂提供依据。【方法】采用随机区组的方法,定点取样调查各处理小区的杂草株数、鲜重,评价供试药剂对杂草防除效果及对移栽水稻安全性。【结果】40%五氟·丁草胺悬浮剂750 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm^2、500 g/L丙草胺乳油525 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm^2和60%丁草胺乳油1 260 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂67.50 g a.i./hm^2在水稻移栽前进行土壤封闭处理,20 d后施用25 g/L五氟磺草胺可分散油悬浮剂30 g a.i./hm^2+30%苄嘧磺隆可湿性粉剂45 g a.i./hm^2进行茎叶喷雾处理,对移栽稻田一年生杂草的株防效均在89%以上,鲜重防效在97%以上。仅施用3%氯氟吡啶酯乳油36 g a.i./hm^2进行茎叶喷雾处理,药后45 d对稗草和空心莲子草的防效达到100%,对移栽稻田一年生杂草的株防效和鲜重防效均在91%以上。【结论】针对稻田扁秆藨草、稗草和空心莲子草危害为主的田块,可选用500 g/L丙草胺乳油或40%五氟·丁草胺悬浮剂或60%丁草胺乳油与30%苄嘧磺隆可湿性粉剂混配进行土壤处理,且20 d后选用25 g/L五氟磺草胺可分散油悬浮剂+30%苄嘧磺隆可湿性粉剂进行茎叶喷雾处理。若不进行土壤封闭处理的田块,针对稗草和空心莲子草危害为主的田块,可选用3%氯氟吡啶酯乳油进行茎叶喷雾防除。
文摘为有效控制福建地区直播稻田禾本科杂草的危害，以莆田市仙游县游洋乡的水稻种植基地为试验点，选择测定1％噁嗪草酮悬浮剂、10％双草醚悬浮剂和20％氰氟草酯油悬浮剂等3种除草剂对稗草、千金子等禾本科杂草的防治效果，筛选确定最佳除草剂及其理想的田间使用浓度。结果表明：20％氰氟草酯油悬浮剂是防治直播稻田中稗草、千金子等禾本科杂草最佳的除草剂，田间推荐使用浓度为45～105 g · hm^ －2（有效成分）兑水675 L · hm ^－2，药后30 d防治效果达均可80.00％以上，无药害产生，对水稻安全。
