Weed control efficacy and biosafety evaluation of Oxaziclomefone
[Objective]This study aims to investigate the efficacy of the herbicide oxaziclomefone on weeds in rice fields and its toxicity effects on rice field organisms.[Method]A field experiment was conducted in the Agricultural Science and Technology Park of Jiangxi Agricultural University in Nanchang Economic and Technological Development Zone,Jiangxi Province.The efficacy of different doses of 10%oxaziclomefone SC concentrate were compared with that of the controls including the 25 g/L pentachlorosulfuron OD,10%pyrimethanil WP,and 10%bensulfuron methyl WP.The efficacy of oxadiazon against barnyardgrass,proso millet,and miscanthus in early and late rice was determined.The acute toxicity of 10%oxaziclomefone SC concentrate and technical product to zebra fish was studied using indoor simulation methods.The acute toxicity of oxaziclomefone technical product to Selenastrum capricornutum was studied using indoor cultivation methods.The acute toxicity of oxaziclomefone technical product to soil organism Eisenia foetida was studied using artificial soil method and filter paper contact method.[Result]The field efficacy test results showed that at the recommended dose,the average efficacy of 10%oxaziclomefone SC against barnyardgrass and proso millet in early and late rice was 92.6%and 92.3%,and the average efficacy against miscanthus and Scirpus variabilis was 70.5%and 61.8%.According to the acute toxicity test results,the 96 h-EC50 of 10%oxaziclomefone SC and oxaziclomefone technical product to zebra fish was higher than 1 000 mg/L,indicating that oxaziclomefone was low toxic to adult zebra fish.The 72 h-EC50 of oxaziclomefone technical product to Selenastrum capricornutum was higher than 800 mg/L,indicating that oxaziclomefone was low toxic to Selenastrum capricornutum.The acute toxicity test results of oxaziclomefone technical product to Eisenia foetida showed that the filter paper contact method could determine that oxaziclomefone was a low toxic pesticide(48 h-LC50>1 000 μg/cm2),while the artificial soil method could determine that oxaziclomefone was a low toxic pesticide(14 d-LC50>1 000 mg/kg).[Conclusion]10%oxaziclomefone SC has good control effect on barnyardgrass and water hyacinth in rice fields,and it has poor control effect on Scirpus variabilis and Iris heterophylla.The acute toxicity test results showed that oxaziclomefone was low toxic to zebra fish and Selenastrum capricornutum,and also low toxic to earthworm Eisenia foetida.Oxaziclomefone is relatively safe for organisms in the rice field environment.
万方数据
维普
