Weeding Initiation Time and Frequency: Their Effect on Performance and the Economics of Weed Control in Cotton
Jul 31, 2018
Experiments were conducted at Serere Agricultural and Animal Production Research Institute (SAARI) in 1996 and 1997 to determine the time of initiation and number of cultivations to optimise returns and the cost of weed control. Weeding was started either early (30 days after planting, (dap)) or late (45 dap). In both cases, plots were cultivated four times at fortnightly intervals but where cultivation was initiated early, some treatments were cultivated five or six times. The herbicide (Tomen) was also tested. Reduced weeding from both late initiation and reduced number of cultivations reduced plant height, numbers of branches, fruiting positions, number of bolls and seed cotton yields. Weeding costs increased with higher number of cultivations but was optimized with early initiation and five cultivations. Non-weeded controls gave no yield while Tomen was ineffective against some dicotyledonous weeds species.