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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/5032

Title: Assessment of weed infestation and economic returns of maize/cowpea intercrop under different tillage systems in northern Ghana
Authors: KOMBIOK, J. M.
Issue Date: 2003
Publisher: Ghana Journal of Agricultural Science
Citation: Ghana Journal of Agricultural Science. Vol. 36, pp107-119, 2003
Abstract: The cost of crop production is mostly attributed to soil tillage and weed control. Against this background, a field experiment was conducted at Nyankpala in the northern Ghanaian savanna ecology in 2000 and 200 I to assess the effects of tillage and cropping systems (CRPSYT) on seed infestation and economic returns of maize (Zea mays L) intercropped with cowpea (Vigna unguicufata L Walp). The results showed that the tractor-ploughed conventional tillage system (Con) and bullock plough (BP) with tillage depths more than 12 cm significantly (P<0.05) increased grain yields of both crops and also significantly reduced weed score, weed count, and the subsequent weed dry matter, probably through deep burying of weed seeds as compared to hand hoe (HH) and zero tillage (ZT) practices. Tillage systems did not influence weed flora, but cropping systems increased the grass composition in maize to about 70 per cent and significantly decreased the broad leaf weeds. The reverse situation was observed in the cowpea and the maize/cowpea intercrop. The predominant grass weed species found on the field were Eleusine indica and Digitaria spp., whi l e the broad leaf weeds were Amaranthus spinosis and Tridax procumbens. The highest cost was incurred under ZT due to high cost of herbicides and labour for spraying while the least was in HH. but the highest net benefits and the highest benefit-cost ratio (BCR) were recorded under BP. The maize component yielded higher BCRs in the sole and the intercrops. However, poor rainfall distribution had negative impact on the yield of both crops, resulting in negative BCRs in the in ter-row cropping systems in both years.
Description: Article published in Ghana Journal of Agricultural Science. Vol. 36,2003. pp 107-119.
URI: http://hdl.handle.net/123456789/5032
Appears in Collections:College of Agric and Natural Resources

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