Table of Contents
ISRN Agronomy
Volume 2013, Article ID 517824, 4 pages
Research Article

Impact of Time of Weeding on Tobacco (Nicotiana tabacum) Growth and Yield

1Africa University, P.O. Box 1320, Mutare, Zimbabwe
2Tobacco Research Board, Kutsaga Farm, P.O. Box 1909, Harare, Zimbabwe

Received 3 July 2013; Accepted 18 August 2013

Academic Editors: G. M. Dal Bello, C. H. Kao, and M.-J. Simard

Copyright © 2013 Mashezha Ian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


An experiment laid in a Randomized Complete Block Design with 4 blocks and 5 treatments, was done at Kutsaga Research Station in the 2012 / 2013 season to study the impact of time of weeding on tobacco production. The treatments comprised of different times of weed control with a weed free treatment as the control. The variables measured were stalk heights at 5, 6 and 7 weeks after planting and, leaf expansion measurements were also recorded at 9, 10 and 11 weeks. Leaf yield was measured at untying using a digital scale. Results showed that Tobacco stalk heights were affected at 5 W.A.P since significant differences () were noted among the treatments. Suppressive effects of weeds were shown at 6 and 7 W.A.P due to effective competition (RCI > 0) in all other treatments excluding the control. There were significant differences () among the treatments on leaf expansion at 9, 10 and 11 W.A.P. The treatment weeded at 4 W.A.P showed leaf yield that was significantly higher (L.S.S = 270.8) than the treatment weeded at 2 W.A.P. Basing on the 3 reaps recorded, time of weeding had an influence tobacco yield.