Improving Fertilizer Recommendations for Cocoa in Ghana Based on Inherent Soil Fertility Characteristics
In Ghana, cocoa has traditionally been grown as a low input crop, which has caused soil fertility deterioration, and thus, the need to integrate fertilizer use into cocoa agricultural practices. However, fertilizers recommended to farmers are general in nature and do not account for specific crop needs and inherent soil fertility conditions. This study evaluates the use of a soil diagnosis model to determine fertilizer recommendations for cocoa based on inherent soil fertility characteristics in the cocoa growing zones of Ghana. The site-specific fertilizer formulations were tested against blanket recommendations (Asaase Wura and Cocofeed) in farmers’ settings from 2009 to 2011. The results showed that DS-formulated site-specific fertilizer performed better than all blanket fertilizers in Western soils especially on the Ferralsols which are very acidic and depleted of base cations. On the other soil conditions, the site-specific formulations were comparable to the blanket formulations. Trend analysis of cocoa response to applied fertilizer suggests that P is a major determinant of cocoa productivity and that P2O5 rates >120 kg ha−1 would be required, when justified economically, for optimal cocoa yield, while potassium could be kept at around 45 kg K2O ha−1.
In view of these results, the cocoa fertilizer formulas proposed for western regions of Ghana could be revised according to the DS model recommendations by taking into consideration the optima presented above. For the other cocoa regions, the DS would not be economic and therefore, proposed formulas should keep P2O5 and K2O around the optima above-presented while compensating for nutrients exported by the crop.
- Ahenkorah, Y. (1969). A note on zinc deficiency in cacao (Theobroma cacao L.). Ghana. Journal Agriculture Science, 2, 3–6.Google Scholar
- Ahenkorah, Y., & Akrofi, G. S. (1975). Amazon cocoa (Theobroma cacao L.) shade and manorial experiment (K2-O1) at Cocoa research institute of Ghana III: Cumulative yield analysis. In Proceedings. 5th international Cocoa research conference (pp. 291–301), Nigeria.Google Scholar
- Anim-Kwapong, G. J., & Frimpong, E. B. (2006). Vulnerability of agriculture to climate change. Impact of climate change on cocoa production. Cocoa Research Institute of Ghana, New Tafo Akim.Google Scholar
- Asomaning, E. J. A., & Kwakwa, R. S. (1967). Boron deficiency and pod malformations in (Theobroma cacao L.) Ghana Journal of Science, 7, 126–129.Google Scholar
- CRIG. (2008). Guide to use of fertilizer on cocoa, Farmers Guide No. 6. Tafo: Cocoa Research Institute of Ghana.Google Scholar
- Dossa, E. L., Arthur, A., Dogbe, W., Mando, A., Afrifa, A. A., & Acquaye, S. (2016). An assessment of inherent chemical properties of soils for balanced fertilizer recommendations for cocoa in Ghana. Unpublished manuscript.Google Scholar
- Gockowski, J., & Sonwa, D. (2010). Cocoa intensification scenarios and their predicted impact on CO2 emissions, biodiversity conservation, and rural livelihoods in the Guinean rainforest of West Africa. Environmental Management, 48, 307. https://doi.org/10.1007/s00267-010-9602-3.CrossRefPubMedGoogle Scholar
- ISRIC. (2006). A framework of international classification, correlation and communication (World Resource Report no 103).Google Scholar
- Jadin, P., & Snoeck, J. (1985). La méthode du diagnostic sol pour calculer les besoins en engrais des cacaoyers. Café Cacao Thé, 29, 255–272.Google Scholar
- SAS Institute Inc. (1999). SAS User’s guide: Statistics. Gary: SAS Institute Inc.Google Scholar
- Snoeck, D., Abekoe, M. K., Afrifa, A. A., & Appiah, M. R. (2006, July 16–21). The soil diagnostic method to compute fertilizer requirements in cocoa plantations. In Proceedings international conference on soil science Accra.Google Scholar
- Snoeck, D., Afrifa, A. A., Ofori-Frimpong, K., Boateng, E., & Abekoe, M. R. (2010). Mapping fertilizer recommendations for cocoa production in Ghana using soil diagnostic and GIS tools. West African Journal of Applied Ecology, 17, 98–107.Google Scholar