[目的]为明确二甲戊灵和扑草净对北苍术田杂草安全防除的混用比例.[方法]采用温室盆栽法测定了二甲戊灵和扑草净不同混用比例对马唐、牛筋草、反枝苋和马齿苋的生物活性及北苍术安全性后,根据选择性指数,采用随机区组法测定了 2种除草剂不同混用比例对北苍术田间杂草除草效果.[结果]二甲戊灵与扑草净按质量比2:1混用后以不同剂量施于杂草和北苍术,对北苍术与反枝苋和马齿苋的选择性指数分别提高12.06和14.96,其按质量比1∶2比例混用后以不同浓度施以杂草和北苍术,对北苍术与马唐和牛筋草的选择性指数分别提高11.75和13.88;二甲戊灵有效成分用量480ga.i./hm2和扑草净有效成分用量160ga.i./hm2混用后对牛筋草、狗尾草表现为增效作用,对反枝苋和马齿苋表现为相加作用,其对杂草的总株防效和鲜质量防效较高且对北苍术安全.[结论]二甲戊灵+扑草净用量为480+160 g a.i./hm2时可用于北苍术田土壤封闭处理防除杂草.
Weed control efficacy of pendimethalin and prometryn combination in Atractylodes chinensi fields
[Aims]The aim of this study is to clarify the combination ratio of pendimethalin and prometryn to prevent and control weeds in the fields of Atractylodes chinensi safely.[Methods]The pot tests in the laboratory were conducted to determine the activity of different combination ratio of pendimethalin and prometryn to Digitaria sanguinalis,Eleusine indica,Portulaca oleracea and Amaranthus retroflexus,as well as the safety to A.chinensi.According to the selectivity index,the weed control efficacy of combinations of the two herbicides at different ratio was tested in the field of A.chinensi,using randomized block design.[Results]When pendimethalin and prometryn were mixed with a mass ratio of 2:1 and sprayed on weeds and A.chinensi,the selectivity index for A.chinensi to P.oleracea and A.retroflexus increased by 12.06 and 14.96 respectively.When the mass ratio was 1∶2,the selectivity index for A.chinensi to D.sanguinalis and E.indica increased by 11.75 and 13.88 respectively.Pendimethalin(480 g a.i./ha)and prometryn(160 g a.i./ha)combination showed a synergistic effect on E.indica and Setaria viridis,an additive effect on P.oleracea and A.retroflexus.It had a high total plant control effect and fresh weight control effect to weeds,and was safe toA.chinensis.[Conclusions]Pendimethalin and prometryn(480+160 g a.i./ha)can be used for soil cealing treatment to control weeds in the A.chinensi fields.
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