Growing cocoa in a changing climate
Researchers investigate the effect of shade trees in cocoa plantations in Ghana
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In sub-Saharan Africa, people are particularly dependent on rain. climate change is increasingly threatening their agriculture. Agroforestry is one possible way of adapting cocoa cultivation: trees growing between the cocoa plants on the plantations provide shade. This can save yields in drier times, as a study by researchers from the University of Göttingen and the European Commission's Joint Research Center shows.
Farmers in Ghana who grow cocoa using agroforestry are better able to survive periods with less rain. However, this only applies to areas with a wetter climate. Where water is already scarce, the researchers found no significant advantages to this cultivation method. The results were published in the journal Agricultural Systems.
The study combines a survey of 365 cocoa-producing households and satellite data on rainfall from 44 villages in five major cocoa-growing regions in Ghana. Using data from 2019 and 2022, the researchers analyzed how the decline in rainfall has affected the yields of cocoa plantations with and without agroforestry. Decreasing rainfall reduces yields overall, as the results show. However, the losses are lower in agroforests. The researchers also compared humid locations, which are more suitable for cocoa cultivation, and dry locations. The result: agroforests maintain yields with less rain only in wetter areas.
"Our results suggest that the positive effects of agroforestry depend on the local climate," says first author Marlene Wätzold from the University of Göttingen. "In drier regions, shade trees may compete with cocoa plants for soil moisture. This could counteract the protection against drying out." There is also competition with fruit trees, explains Wätzold: "Avocado trees, which are increasingly planted in dry regions, have shallow roots and a high water requirement. This increases competition for water."
Agroforestry can play an important role in adapting to climate change, the research team emphasizes. However, its promotion should be tailored to the local climate. "Our results underline the need for further research into adaptation strategies in agroforestry. It is also important to understand which tree species are suitable under which climatic conditions," says Prof. Dr. Meike Wollni from the University of Göttingen. "In some areas, the conditions for growing cocoa are becoming increasingly unfavorable. In future, people there should focus more on crops that tolerate drought better, such as cashew nuts," concludes Dr. Katharina Krumbiegel from the Joint Research Centre.
Note: This article has been translated using a computer system without human intervention. LUMITOS offers these automatic translations to present a wider range of current news. Since this article has been translated with automatic translation, it is possible that it contains errors in vocabulary, syntax or grammar. The original article in German can be found here.
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