Research Journal of Seed Science1819-35522151-6146Science International10.3923/rjss.2014.125.131AjibolaA.T. ModupeolaT.O. 4201474Field experiment was conducted at the Teaching and Research Farm (T and RF),
Ladoke Akintola University of Technology (LAUTECH), Ogbomoso, Nigeria (8°10'N
and 40°10'E) in the year 2013 to determine the optimum weeding regime using
two selected Kenaf varieties. The experiment was arranged as split plot fitted
into a randomized complete block design with three replications. Two Kenaf varieties;
Cuba 108a and Tangum1 were the main treatment and five weeding regimes viz.,
a weed free at all times (WF), weedy all through (WD), weed once (WI) after
3 weeks of planting (WAP) and weed twice (W2) at 3 and 6 WAP, weed thrice (W3)
at 3, 6 and 9 WAP were the sub plot treatments. Growth parameters were adversely
affected by weed competition. Plant height was significantly reduced under full
season weed infestation. The same trend was observed for numbering of leaves
and stem girth. However, the interaction effect of weeding regime and variety
of number of pods, weight of 1000 seeds and seed yield was significant. Weeding
time was important because with increasing competition duration number of pod/plant,
seed yield and 1000 seed weight decreased. Weeding regime had significant effect
on weed population and weed density. Significantly higher value of weed population
and weed density were recorded in WD and W1 while the least was recorded in
W3. So weed reduce the growth and yield of Kenaf. Lower growth and yield in
case of weedy (WD), weed at 3 WAP (W1) and weeding treatment could be attributed
to comparable higher weed density, competition of nutrients and moisture which
in this treatment was detrimental to Kenaf production. All Kenaf growth parameters
increase with an increase in weeding regime. Weedy free (WF) weeding regime
throughout the study produced Kenaf highest plant height while the lowest height
was recorded in weedy (WD) treatment. Weeding once was detrimental as no weeding
(WD). Weed free (WF), weed thrice (W3) and weed twice (W2) were not significantly
different, therefore to reduce labour cost weed must be eradicated twice at
3 and 6 WAP.]]>Agbaje, G.O., J.O. Saka, A.A. Adegbite and O.O. Adeyeye,2008Hibiscus cannabinus L.) fibre cultivation.]]>7565574El Naim, A.M., O. Abdalrasol and M.F. Ahmed,201312732Ajibola, A.T. and T.O. Modupeola,201495157Alam, S.M.,20072007Elnaim, A.M., M.A. Elduoma and A.E. Abdalla, 2010Arachis hypogea L.) in North Kordofan of Sudan.]]>111881193Askew, S.D. and J.W. Wiltcut,200149184189Bedry, K.A.,2007Vicia faba L.) yield in the Northern State of Sudan.]]>15220231El Naim, A.M. and S.E. Ahmed,2010Hibiscus sabdariffa L) varieties under rain fed.]]>442504255Ishag, H.M.,1971Arachis hypogaea L.) in the Sudan Gezira.]]>77237242Rezvani, M., M. Ahangari and F. Zaefarian,201269125127Ijlal, Z., A. Tanveer, M.E. Safdar, A. Aziz and M. Ashraf et al.,2011Sesamum indicum L.).]]>175163SAS.,19891989Gomez, K.A. and A.A. Gomez,19842nd Edn.,Pages: 704Pages: 704Benga, S.H., R. Hamilton, L.M. Dwyer, D.W. Stewrart and D. Cloutier et al.,200114293302