부산대학교 도서관

A field experiment was conducted at Faisalabad, Pakistan, during 2004 and 2005 to study the effect of formasulfuron + isoxadifen-ethyl applied alone and in combination with urea on weeds and yield of spring (March-May) and autumn(August-October) maize (Zea mays L.). Six treatments comprised of weedy check, manual hoeing, formasulfuron + isoxadifen-ethyl 1125 g a.i. ha-1 , 1125 g a.i. ha-1 + 1% urea, 1125 g a.i. ha-1 + 2% urea and 1125 g a.i. ha-1 + 3% urea solution sprayed as post-emergence (20 days after sowing) at four leave stage. Manual hoeing and formasulfuron + isoxadifen-ethyl 1125 g a.i. ha-1 combined with 3% urea were the most effective treatments for controlling Cyperus rotundus, Achyranthus aspera and Trianthema portulacastrum. Maximum weed control efficiency with formasulfuron + isoxadifen-ethyl1125 g a.i. ha-1 combined with 3% urea was 87.0% for C.rotundus, 75.2% for A. aspera in spring maize. It was 82.0% for C. rotundus and 90.0% for T. portulacastrum in autumn maize. The maize yield from formasulfuron + isoxadifen-ethyl 1125 g a.i. ha-1 + 3% urea treated plots was 56% higher in spring and 68% higher in autumn than those from weedy check and was comparable to that of manual weeding. Maximum loss in grain yield in the weedy check control during spring and autumn maize was 44 and 41%, respectively. [ABSTRACT FROM AUTHOR]