Field experiments were conducted from July to October, during 2012 and 2013 cropping
seasons, at the Research Farm, University of Agriculture, Makurdi, Nigeria, to evaluate the effects
of intra-row spacing of sesame and frequency of weeding on yields of maize-sesame intercrop. The
trial was a 3 x 3 factorial experiment fitted in a randomized complete block design with four
replications. Nine of the treatments consisted of intercropped maize with sesame sown at the intrarow
spacing of 10 cm, 15 cm and 20 cm, and at the varied weeding frequencies: maize-sesame
intercrop sown on plots weeded once (1x) at 3 weeks after planting (WAP); maize-sesame intercrop
sown on plots weeded twice (2x) at 3 and 6 WAP; maize-sesame intercrop sown on plots not
weeded (NW). Sole sesame and sole maize respectively sown at their recommended intra-row
spacing of 10 cm and 30 cm and at their recommended frequency of weeding (2x at 3 and 6 WAP)
constituted the tenth and eleventh treatments, which also served as control plots. The results
obtained showed that in a maize-sesame intercrop, increasing intra-row spacing of sesame up to 20
cm, on plots weeded 2x at 3 and 6 WAP, significantly (P≤0.05) produced the highest intercrop
yields of maize and sesame. This level of treatment not only recorded the lowest competitive
pressure, but gave the highest total intercrop yields, highest land equivalent coefficient values (1.01
and 1.13 respectively, in years 2012 and 2013), indicating the highest yield advantage, and highest
land equivalent ratio (LER) values of 2.11 and 2.25 respectively recorded for years 2012 and 2013.
With these LER values, 52.6 % and 55.6 % of land were respectively saved in years 2012 and 2013,
which could be used for other agricultural purposes. The implication of study showed that, to
maximize intercrop yields of maize and sesame in a maize-sesame intercrop, the appropriate intrarow
spacing for sesame is 20 cm, while the optimal frequency of weeding is 2x at 3 and 6 WAP.
This should therefore, be recommended for Makurdi location, Nigeria.
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