Assessment of Weed Control Methods in Bread Wheat on Farmers' Fields
1993
Giref Sahile | Tanner, Douglas G. | Amanuel Gorfu (IAR, Addis Abeba (Ethiopia))
Weed control trials were located on farmers' fields in Dosha and Gondie in Arsi region in 1988 and 1989 in bread wheat to compare different combinations of hand weeding with and without grass and/or broadleaf herbicides. The combined analysis of variance indicated significant (P less than 0.05) difference amongst treatments interms of grain yield. The unweeded treatment (1380 kg ha-1) was significantly outyielded only by diclofopmethyl (Illoxan 28 percent EC) without supplementary hand weeding (2191 kg ha-1) and the Illoxan plus Brittox 52.5 percent EC (ioxynil + bromoxynil + MCPP) combination (2724 kg ha-1). Efficacy data from the same trials that illoxan reduced the annual grass weed populations by 74 percent to 95 percent across all sites, while Brittox reduced the broadleaf weed populations by 54 percent to 93 percent. Economic analyses indicated that, using the official grain price Illoxan alone gave a marginal rate of return (MRR) of 423 percent and 588 percent using the local market price. Sensitivity analyses for herbicide pricing indicated that at double the official price, herbicide treatments were still the most profitable, but the single hand weeding treatment was no longer dominated. At three times the offical price, Illoxan alone was still the most profitable treatment with an acceptable MRR of 62 percent and 113 percent relative to a single hand weeding using offical and local prices, respectivley.
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