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
【目的】筛选防治稻瘟病的田间药剂,为新疆水稻稻瘟病的科学防治提供指导。【方法】采用随机区组的方法,定点调查各处理稻瘟病发生情况,评价供试药剂对稻瘟病的防治效果。【结果】药后14 d,75%三环唑WP 225 g a. i/hm^2处理和325 g/L苯...【目的】筛选防治稻瘟病的田间药剂,为新疆水稻稻瘟病的科学防治提供指导。【方法】采用随机区组的方法,定点调查各处理稻瘟病发生情况,评价供试药剂对稻瘟病的防治效果。【结果】药后14 d,75%三环唑WP 225 g a. i/hm^2处理和325 g/L苯甲·嘧菌酯SC 243.75 g a. i/hm^2处理对水稻稻瘟病的防效最高,分别为72.63%和71.77%;其次是2%春雷霉素SL 30 g a. i/hm^2处理和500 g/L甲基硫菌灵SC 1 125 g a. i/hm^2处理,对水稻稻瘟病防效分别为61.48%和61.27%。各药剂处理对水稻生长发育无异常影响、无药害。【结论】75%三环唑WP 225 g a. i/hm^2处理、325 g/L苯甲·嘧菌酯SC 243.75 g a. i/hm^2处理、2%春雷霉素SL 30 g a.i/hm^2处理和500 g/L甲基硫菌灵SC 1 125 g a. i/hm^2处理,可有效控制水稻稻瘟病的发生与危害,且对水稻生长安全,可在大田合理轮换使用。展开更多
This paper explores a highly accurate identification modeling approach for the ship maneuvering motion with fullscale trial. A multi-innovation gradient iterative(MIGI) approach is proposed to optimize the distance me...This paper explores a highly accurate identification modeling approach for the ship maneuvering motion with fullscale trial. A multi-innovation gradient iterative(MIGI) approach is proposed to optimize the distance metric of locally weighted learning(LWL), and a novel non-parametric modeling technique is developed for a nonlinear ship maneuvering system. This proposed method’s advantages are as follows: first, it can avoid the unmodeled dynamics and multicollinearity inherent to the conventional parametric model; second, it eliminates the over-learning or underlearning and obtains the optimal distance metric; and third, the MIGI is not sensitive to the initial parameter value and requires less time during the training phase. These advantages result in a highly accurate mathematical modeling technique that can be conveniently implemented in applications. To verify the characteristics of this mathematical model, two examples are used as the model platforms to study the ship maneuvering.展开更多
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【目的】筛选防治稻瘟病的田间药剂,为新疆水稻稻瘟病的科学防治提供指导。【方法】采用随机区组的方法,定点调查各处理稻瘟病发生情况,评价供试药剂对稻瘟病的防治效果。【结果】药后14 d,75%三环唑WP 225 g a. i/hm^2处理和325 g/L苯甲·嘧菌酯SC 243.75 g a. i/hm^2处理对水稻稻瘟病的防效最高,分别为72.63%和71.77%;其次是2%春雷霉素SL 30 g a. i/hm^2处理和500 g/L甲基硫菌灵SC 1 125 g a. i/hm^2处理,对水稻稻瘟病防效分别为61.48%和61.27%。各药剂处理对水稻生长发育无异常影响、无药害。【结论】75%三环唑WP 225 g a. i/hm^2处理、325 g/L苯甲·嘧菌酯SC 243.75 g a. i/hm^2处理、2%春雷霉素SL 30 g a.i/hm^2处理和500 g/L甲基硫菌灵SC 1 125 g a. i/hm^2处理,可有效控制水稻稻瘟病的发生与危害,且对水稻生长安全,可在大田合理轮换使用。
基金financially supported in part by the National High Technology Research and Development Program of China(863Program,Grant No.2015AA016404)the National Natural Science Foundation of China(Grant Nos.51109020,51179019 and 51779029)the Fundamental Research Program for Key Laboratory of the Education Department of Liaoning Province(Grant No.LZ2015006)
文摘This paper explores a highly accurate identification modeling approach for the ship maneuvering motion with fullscale trial. A multi-innovation gradient iterative(MIGI) approach is proposed to optimize the distance metric of locally weighted learning(LWL), and a novel non-parametric modeling technique is developed for a nonlinear ship maneuvering system. This proposed method’s advantages are as follows: first, it can avoid the unmodeled dynamics and multicollinearity inherent to the conventional parametric model; second, it eliminates the over-learning or underlearning and obtains the optimal distance metric; and third, the MIGI is not sensitive to the initial parameter value and requires less time during the training phase. These advantages result in a highly accurate mathematical modeling technique that can be conveniently implemented in applications. To verify the characteristics of this mathematical model, two examples are used as the model platforms to study the ship maneuvering.
