EGU2020-10850
https://doi.org/10.5194/egusphere-egu2020-10850
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Defining the most suitable source of irrigation water for farmers and communities: a socio-agricultural model

Giulia Vico1, Lucia Tamburino1, James R Rigby2, and Giuliano Di Baldassarre3
Giulia Vico et al.
  • 1Swedish University of Agricultural Sciences (SLU), Department of Crop Production Ecology, Uppsala, Sweden (giulia.vico@slu.se, lucia.tamburino@slu.se)
  • 2USDA-ARS National Sedimentation Laboratory, Oxford, MS, USA (jr.rigby@usda.gov)
  • 3Department of Earth Science, Uppsala University, Uppsala, Sweden (giuliano.dibaldassarre@geo.uu.se)

Supplemental irrigation is critical to ensure high and stable crop yields in many regions. Water needs for irrigation will increase in the future, because of higher demands for food, feed and biofuels, and warmer, more extreme, climates. Water withdrawals for irrigation has led to plummeting water tables in many aquifers. Water harvesting like on-farm ponds can be a more sustainable approach to meet water requirements for irrigation. Nevertheless, whether groundwater or on-farm pond is the most suitable source of irrigation water for a single farmer and the whole community depends not only on the crop water demands and the unpredictability of rainfall, but also on the farmers’ preferences, in terms of risk aversion and long/short-view orientation and how they evolve in time. Here we couple the dynamics of crop development to that of soil water availability and water stored in on-farm ponds and aquifers. For a community of farmers, we also consider each farmer’s short/long-view orientation, and how it evolves in time. While general, the model is applied to the case of the Lower Mississippi River Basin, in the south-eastern USA, where irrigation has already led to a significant decline in groundwater levels. Results show that, for a single farmer, production maximization and risk of low yield minimization are often irreconcilable criteria when sizing the on-farm pond. Moreover, on farm ponds as source of irrigation can be more advantageous as source of water for the community, leading to a higher and more stable income. Yet, this choice is beneficial for the individual farmer only under extreme climates and in communities where the use of on-farm ponds is common.

How to cite: Vico, G., Tamburino, L., Rigby, J. R., and Di Baldassarre, G.: Defining the most suitable source of irrigation water for farmers and communities: a socio-agricultural model, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10850, https://doi.org/10.5194/egusphere-egu2020-10850, 2020

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Display material version 1 – uploaded on 02 May 2020
  • AC1: Display highlights, Giulia Vico, 04 May 2020

    The suitability of on-farm ponds as an alternative to groundwater as source of water for irrigation is explored by means of a minimalist agent-based model.

    For a single farmer, the pond size that maximizes crop production does not simultaneously allow the minimization of the risk of low yield.

    When considering the whole community, on farm ponds can lead to higher and more stable incomes for the community, but they are not advantageous for the single farmers that adopt them, except under extreme climates and in communities where the use of on-farm ponds is widespread. Changing behavior as a result of previous experiences has negative effects on the average income of the farmer.