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Drought effects on root and tuber production: A meta-analysis

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  • Daryanto, Stefani
  • Wang, Lixin
  • Jacinthe, Pierre-André

Abstract

Roots and tubers such as potatoes and cassava rank within the top six among the world’s most important food crops, yet the extent to which their global production has been adversely affected by drought remains unclear. Greater uncertainties exist on how drought effects co-vary with: (1) root and tuber species, (2) soil texture, (3) agro-ecological region, and 4) drought timing. It is often assumed that potato is drought-sensitive whereas cassava and sweet potato are resistant to drought, but this assumption has not been quantitatively tested. To address these uncertainties, we collected literature data between 1980 and 2015 that reported monoculture root and tuber yield responses to drought under field conditions, and analyzed this large data set using meta-analysis technique. Our results showed that the amount of water reduction was positively related with yield reduction, but the extent of the impact varied with root or tuber species and the phenological phase during which drought occurred. In contrast to common assumptions regarding drought resistance of certain root and tuber crops, we found that yield reduction was similar between potato and species thought to be drought-resistant such as cassava and sweet potato. Here we suggest that drought-resistance in cassava and sweet potato could be more related to survival rather than yield. All root or tuber crops, however, experienced greater yield reduction when drought struck during the tuberization period compared to during their vegetative phase. The effect of soil texture on yield reduction was less obvious, and similarly we did not find any significant effects of region (and related climatic factors) on either yield reduction or drought sensitivity. Our study provides useful information that can inform agricultural planning, and influence the direction of research for improving the productivity and resilience of these under-utilized crops in the drought-prone regions of the world.

Suggested Citation

  • Daryanto, Stefani & Wang, Lixin & Jacinthe, Pierre-André, 2016. "Drought effects on root and tuber production: A meta-analysis," Agricultural Water Management, Elsevier, vol. 176(C), pages 122-131.
    • Handle: RePEc:eee:agiwat:v:176:y:2016:i:c:p:122-131
    DOI: 10.1016/j.agwat.2016.05.019
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    1. Unlu, Mustafa & Kanber, Riza & Senyigit, Ulas & Onaran, Huseyin & Diker, Kenan, 2006. "Trickle and sprinkler irrigation of potato (Solanum tuberosum L.) in the Middle Anatolian Region in Turkey," Agricultural Water Management, Elsevier, vol. 79(1), pages 43-71, January.
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    4. Onodu, Bonaventure & Culas, Richard & Nwose, Ezekiel, 2020. "Nutritional and health values of indigenous root and tuber crops compared to imported carbohydrate (such as wheat): A case study example from Delta state Nigeria," 2020 Conference (64th), February 12-14, 2020, Perth, Western Australia 305252, Australian Agricultural and Resource Economics Society.
    5. Hemalatha Palanivel & Shipra Shah, 2021. "Unlocking the inherent potential of plant genetic resources: food security and climate adaptation strategy in Fiji and the Pacific," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 23(10), pages 14264-14323, October.
    6. Daryanto, Stefani & Wang, Lixin & Jacinthe, Pierre-André, 2017. "Global synthesis of drought effects on cereal, legume, tuber and root crops production: A review," Agricultural Water Management, Elsevier, vol. 179(C), pages 18-33.
    7. Li, Siping & Zhao, Lei & Sun, Ninghui & Liu, Qing & Li, Huan, 2021. "Photosynthesis product allocation and yield in sweetpotato with different irrigation levels at mid-season," Agricultural Water Management, Elsevier, vol. 246(C).
    8. Araneda-Cabrera, Ronnie J. & Bermúdez, María & Puertas, Jerónimo, 2021. "Assessment of the performance of drought indices for explaining crop yield variability at the national scale: Methodological framework and application to Mozambique," Agricultural Water Management, Elsevier, vol. 246(C).
    9. Ning Wang & Yingying Xing & Xiukang Wang, 2019. "Exploring Options for Improving Potato Productivity through Reducing Crop Yield Gap in Loess Plateau of China Based on Grey Correlation Analysis," Sustainability, MDPI, vol. 11(20), pages 1-14, October.
    10. Nouman Afzal & Stavros Afionis & Lindsay C. Stringer & Nicola Favretto & Marco Sakai & Paola Sakai, 2021. "Benefits and Trade-Offs of Smallholder Sweet Potato Cultivation as a Pathway toward Achieving the Sustainable Development Goals," Sustainability, MDPI, vol. 13(2), pages 1-17, January.
    11. Matchaya, Greenwell C. & Tadesse, Getaw & Kuteya, Auckland N., 2022. "Rainfall shocks and crop productivity in Zambia: Implication for agricultural water risk management," Agricultural Water Management, Elsevier, vol. 269(C).

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