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Warm nights drive Coffea arabica ripening in Tanzania

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Abstract

Studies have demonstrated that plant phenophases (e.g. budburst, flowering, ripening) are occurring increasingly earlier in the season across diverse ecologies globally. Despite much interest that climate change impacts have on coffee (Coffea arabica), relatively little is known about the driving factors determining its phenophases. Using high-resolution microclimatic data, this study provides initial insights on how climate change is impacting C. arabica phenophases in Tanzania. In particular, we use generalized additive models to show how warming nocturnal temperatures (Tnight), as opposed to day-time or maximum temperatures, have a superseding effect on the ripening of coffee and subsequent timing of harvest. A warm night index (WNI), generated from mean nocturnal temperature, permits accurate prediction of the start of the harvest season, which is superior to existing methods using growing degree days (GDD). The non-linear function indicates that a WNI of 15 °C is associated with the latest ripening coffee cherries (adjusted R2 = 0.95). As the WNI increases past the inflection point of ~ 16 °C, ripening occurs earlier and progresses more or less linearly at a rate of ~ 17 ± 1.95 days for every 1 °C increase in WNI. Using the WNI will thus not only allow farmers to more accurately predict their harvest start date, but also assist with identifying the most suitable adaptation strategies which may reduce harvest-related costs and buffer potential losses in quality and production.

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Acknowledgments

This work was implemented as part of the CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), which is carried out with support from CGIAR Fund Donors and through bilateral funding agreements. For details, please visit https://ccafs.cgiar.org/donors. The views expressed in this document cannot be taken to reflect the official opinions of these organizations. IITA, the Bundesministerium für Wirtschaftliche Zusammenarbeit und Entwicklung (BMZ), Global Change and Sustainability Research Institute (GCSRI) and the Open Society Foundation are thanked for financial and logistical support.

Data and code availability

Data and code used in this study are stored at HARVARD Dataverse (https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/RFLQBD)

Funding

This work was implemented as part of the CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), which is carried out with support from CGIAR Fund Donors and through bilateral funding agreements. For details please visit https://ccafs.cgiar.org/donors. The views expressed in this document cannot be taken to reflect the official opinions of these organizations. IITA, the Bundesministerium für Wirtschaftliche Zusammenarbeit und Entwicklung (BMZ), Global Change and Sustainability Research Institute (GCSRI) and the Open Society Foundation are thanked for financial and logistical support.

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Correspondence to A. C. W. Craparo.

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Craparo, A.C.W., Van Asten, P.J.A., Läderach, P. et al. Warm nights drive Coffea arabica ripening in Tanzania. Int J Biometeorol 65, 181–192 (2021). https://doi.org/10.1007/s00484-020-02016-6

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  • DOI: https://doi.org/10.1007/s00484-020-02016-6

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