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- W162256909 abstract "Two field experiments were conducted at MARDI station, Seberang Perai, Penang. Theexperiments were: 1) Critical period in saturated and flooded field (off season 2005 andmain season 2005/2006); 2) Chemical weed control in saturated field (main season2005/2006 and off season 2006). The objectives of the study were: a) to determine thecritical period of weed competition under saturated and flooded field conditions; b) todetermine the efficacy of herbicides in controlling weed and their subsequent effect onrice productivity under saturated field. The first study consisted of different weedingperiods under saturated and flooded field conditions. Meanwhile, the second experimentevaluated ten widely used herbicides which were available in the market eitherindividually or as mixture, and sequentially applied in direct seeded rice fields duringthe critical period of weed competition under saturated field condition. Results from the first experiment indicated that Summed Dominance Ratio (SDR) ofweed composition was different under saturated condition compared with floodedcondition for both seasons. The dominance ranking of weed groups in off season 2005under saturated condition was sedges followed by grasses and broadleaved weeds, whilein main season 2005/2006, grassy weeds was the most dominant followed by sedges andbroadleaved weeds. Under flooded condition the dominance ranking of weed groups wasbroadleaved followed by grasses and sedges where the trend was the same in bothseasons. The numbers of tillers, along with rice grain yield were significantly affectedby weed competition in both saturated and flooded condition. Yield loss due to weedcompetition was higher in saturated condition (54.5%) than in flooded condition(35.2%). Based on the 5% level of yield loss, the critical period in off season 2005 wasat 2-71days after sowing (DAS) under saturated condition, and 15-73 DAS underflooded condition. In the main season 2005/2006, the critical periods were at 1-72 DASin saturated condition and 2-98 DAS in flooded condition." @default.
- W162256909 created "2016-06-24" @default.
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- W162256909 date "2009-08-01" @default.
- W162256909 modified "2023-09-27" @default.
- W162256909 title "Critical Period for Weed Control in Saturated and Flooded Field, and Chemical Weed Control in Direct Seeded Rice Under Saturated Condition" @default.
- W162256909 hasPublicationYear "2009" @default.
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