Two improved cassava cultivars consisting of a profusely branching type (TMS 30395) and an upright, moderately branching type (TMS 30001) were grown at two population densities as components of mixtures involving two maize (TZB) populations. Maize yield was depressed by TMS 30395 at the higher cassava population density of 10 000 plants/ha but not at 5000 plants/ha. Cassava cultivar TMS 30001 did not affect maize yield at either of the two population densities. Two hand weedings or the use of a preemergence herbicide (Primextra) limited yield reductions caused by weeds in the maizecassava intercrop. Root yield was generally higher for TMS 30001 than for TMS 30395. The highest root yield for each cultivar was obtained when 10000 cassava plants/ha were intercropped with maize at 20000 plants/ha. This combination gives the optimum plant population (30000 plants/ha) for the mixture. The highest total food energy and the lowest weed weight were observed at this population. Cost of weeding was lowest where the herbicide, Primextra, was used. This treatment gave the highest return on investment at the optimum crop combination.
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