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Economic trade-offs of biomass use in crop-livestock systems: Exploring more sustainable options in semi-arid Zimbabwe

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  • Homann-Kee Tui, Sabine
  • Valbuena, Diego
  • Masikati, Patricia
  • Descheemaeker, Katrien
  • Nyamangara, Justice
  • Claessens, Lieven
  • Erenstein, Olaf
  • van Rooyen, Andre
  • Nkomboni, Daniel

Abstract

In complex mixed crop-livestock systems with limited resources and biomass scarcity, crop residues play an important but increasingly contested role. This paper focuses on farming systems in the semi-arid areas of Zimbabwe, where biomass production is limited and farmers integrate crop and livestock activities. Conservation Agriculture (CA) is promoted to intensify crop production, emphasizing the retention of surface mulch with crop residues (CR). This paper quantifies the associated potential economic trade-offs and profitability of using residues for soil amendment or as livestock feed, and explores alternative biomass production options. We draw on household surveys, stakeholder feedback, crop, livestock and economic modeling tools. We use the Trade-Off Analysis Model for Multi Dimensional Impact Assessment (TOA-MD) to compare different CR use scenarios at community level and for different farm types: particularly the current base system (cattle grazing of maize residues) and sustainable intensification alternatives based on a CA option (mulching using maize residues±inorganic fertilizer) and a maize–mucuna (Mucuna pruriens) rotation. Our results indicate that a maize–mucuna rotation can reduce trade-offs between CR uses for feed and mulch, providing locally available organic soil enhancement, supplementary feed and a potential source of income. Conservation Agriculture without fertilizer application and at non-subsidized fertilizer prices is not financially viable; whereas with subsidized fertilizer it can benefit half the farm population. The poverty effects of all considered alternative biomass options are however limited; they do not raise income sufficiently to lift farmers out of poverty. Further research is needed to establish the competitiveness of alternative biomass enhancing technologies and the socio-economic processes that can facilitate sustainable intensification of mixed crop-livestock systems, particularly in semi-arid environments.

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  • Homann-Kee Tui, Sabine & Valbuena, Diego & Masikati, Patricia & Descheemaeker, Katrien & Nyamangara, Justice & Claessens, Lieven & Erenstein, Olaf & van Rooyen, Andre & Nkomboni, Daniel, 2015. "Economic trade-offs of biomass use in crop-livestock systems: Exploring more sustainable options in semi-arid Zimbabwe," Agricultural Systems, Elsevier, vol. 134(C), pages 48-60.
    • Handle: RePEc:eee:agisys:v:134:y:2015:i:c:p:48-60
    DOI: 10.1016/j.agsy.2014.06.009
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    4. Assogba, Gildas G.C. & Adam, Myriam & Berre, David & Descheemaeker, Katrien, 2022. "Managing biomass in semi-arid Burkina Faso: Strategies and levers for better crop and livestock production in contrasted farm systems," Agricultural Systems, Elsevier, vol. 201(C).
    5. Nhantumbo, Nascimento S. & Zivale, Clemente O. & Nhantumbo, Ivete S. & Gomes, Ana M., 2016. "Making agricultural intervention attractive to farmers in Africa through inclusive innovation systems," World Development Perspectives, Elsevier, vol. 4(C), pages 19-23.
    6. Adam M. Komarek, 2018. "Conservation agriculture in western China increases productivity and profits without decreasing resilience," Food Security: The Science, Sociology and Economics of Food Production and Access to Food, Springer;The International Society for Plant Pathology, vol. 10(5), pages 1251-1262, October.
    7. Olson, Kent & Gauto, Victor & Erenstein, Olaf & Teufel, Nils & Swain, Braja & Tui, Sabine Homann-Kee & Duncan, Alan, 2021. "Estimating Farmers’ Internal Value of Crop Residues in Smallholder Crop-Livestock Systems: A South Asia Case Study," 2021 Conference, August 17-31, 2021, Virtual 315188, International Association of Agricultural Economists.
    8. Sabine Homann-Kee Tui & Katrien Descheemaeker & Roberto O. Valdivia & Patricia Masikati & Gevious Sisito & Elisha N. Moyo & Olivier Crespo & Alex C. Ruane & Cynthia Rosenzweig, 2021. "Climate change impacts and adaptation for dryland farming systems in Zimbabwe: a stakeholder-driven integrated multi-model assessment," Climatic Change, Springer, vol. 168(1), pages 1-21, September.
    9. Rodriguez, D & de Voil, P & Rufino, MC & Odendo, M & van Wijk, MT, 2017. "To mulch or to munch? Big modelling of big data," Agricultural Systems, Elsevier, vol. 153(C), pages 32-42.
    10. Kanter, David R. & Musumba, Mark & Wood, Sylvia L.R. & Palm, Cheryl & Antle, John & Balvanera, Patricia & Dale, Virginia H. & Havlik, Petr & Kline, Keith L. & Scholes, R.J. & Thornton, Philip & Titton, 2018. "Evaluating agricultural trade-offs in the age of sustainable development," Agricultural Systems, Elsevier, vol. 163(C), pages 73-88.
    11. Tittonell, Pablo & Gérard, Bruno & Erenstein, Olaf, 2015. "Tradeoffs around crop residue biomass in smallholder crop-livestock systems – What’s next?," Agricultural Systems, Elsevier, vol. 134(C), pages 119-128.

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