Research on application techniques for a novel herbicide 10% ZJ0273 EC on transplanted rapes

The control spectrum, suitable application time and action speed of the novel herbicide ZJ0273 were studied with conventional outdoor and greenhouse pot-test methods. The security of herbicide to oilseed rape and controlling effect in field trial were tested. The results showed that the sensitive weeds to ZJ0273 at the application rate of 60g ai/hm~2 were mainly gramineous weeds, such as Alopecurus aequalis, A. japonicus, Malachium aquaticum, Chenopodium serotinum, Poa annua, Sclerochloa kengiana, Beckmannia syzigachne, Polypogon fugax, Ranunculus japonicus and Capsella buras-pastoris with the efficacy over 80%. The herbicide was a slow-acting herbicide, and the suitable application time was in early 1-3 leaf postemergence stage of the weeds. The safe dosage to Huyou No.15 (Brassica napus L.), a new rapeseed variety, doubled the recommended maximum dosage. An application dosage of 45-60 g ZJ0273ai/hm~2 in early 1-3 leaf postemergence stage of the weeds was recommended, and the total weed-control effect was among 72.3%-97.6%.