Control of Cyperus rotundus on Vertisols and vertic clays in Ghana

Darkwa, E.O.; Johnson, B.K.; Nyalemegbe, K.; Terry, P.J.; Willcocks, T.J.

1999 Brighton crop protection conference weeds Proceedings of an international conference, Brighton, UK, 15-18 November 1999 (Volume 1): 373-378


Accession: 003393280

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Field trials on Vertisols at Kpong, Ghana, showed that 1.8 kg a.e./ha glyphosate reduced tuber populations of C. rotundus by 95% after being applied at the beginning of 4 cropping seasons during 1997 and 1998. Yields of maize grown during the major seasons of these years were significantly increased by use of glyphosate. In 1997, the maize yields were 1.48 and 2.73 t/ha in the hand weeding and glyphosate treatments on camber beds, respectively. Camber beds (4.8 m-wide raised beds) appeared to increase crop growth in typical wet seasons (average annual rainfall of 1200 mm), compared to flat seed beds, but not in seasons that were much drier than average. The combination of camber beds for land drainage and glyphosate for controlling C. rotundus and other weeds is concluded to be appropriate technology for small scale farmers in the Accra Plains of Ghana.