| Autor: |
Weber, G., Elemo, K., Lagoke, S. T. O. |
| Předmět: |
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| Zdroj: |
Weed Research; Jun1995, Vol. 35 Issue 3, p167-178, 12p, 10 Charts |
| Abstrakt: |
The dynamics of weed populations were analysed in intensified cereal-based cropping systems of the northern Guinea savanna in Nigeria, A total of four common weed associations were identified through cluster analysis. Five factors describing soil fertility conditions and field history best differentiated the weed communities according to a discriminant model. The analysis shows that maize-based cropping systems with a high frequency of cereal cropping and a low frequency of noncereal cropping tended to be dominated by weeds such as Commetina spp. and Kyttinga squamutata. As soil fertility declined, Vernonia spp. and Ectipta prostrata became more important. Increased frequency of noncereal crops in mixed cropping with cereals was associated with reduced incidence of weeds such as Leucas martinicensis, Oldenlandia corymbosa, Spermacoce verticittata, Ludwigia hyssopifotia, Cetosia taxa, and Ipomoea spp. Further diversification of cereal-based systems to obtain a reduced frequency of cereals is likely to increase the incidence of Dactytoctenium aegyptium in crop fields. The information provides guidance for technology development and transfer on weed control for intensifying systems in the northern Guinea savanna of Africa. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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