Application techniques of bispyribac-sodium for controlling weeds in direct seeded rice fields.

Application techniques of bispyribac sodium for controlling weeds were studied in direct seeded rice fields in Zhejiang,China in 1998-1999.Results showed bispyribac sodium is very effective on gramineae,sedge and broad leaf weeds including Echinochloa crusgalli,Paspalum distichum, and Alternanthera philoxeroides, but not on Leptochloa chinensis. It was recommended that 10% bispyribac sodium SC be sprayed at 225-450 ml/hm 2 with 450 L/hm 2 of water during 3 to 5 leaf stage of barnyardgrass,and sometimes applied with thiobencarb or fenoxaprop p ethyl specially for L.chinensis.