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Reversing Agro-Based Land Degradation through Conservation Agriculture: Emerging Experiences from Zambia’s Smallholder Farming Sector

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  • Bridget, Bwalya Umar

Abstract

This study reports on the land degradation minimizing effects of Conservation Agriculture (CA) as promoted among smallholder Zambian farmers. It found no evidence of CA associated improvements in soil fertility after five years of CA practice, most probably because crop residues were removed from the fields. The study reports high phosphorus (15.53 mg kg-1) and potassium (0.75 cmol kg-1) levels, low nitrogen (0.12 %) and organic carbon (1.19 %) levels, and no plough/hoe pans in soils from both CA and conventionally (CV) managed fields. This is in part contrary to the dominant land degradation narratives which have been the basis for promoting CA in the study areas. Faidherbia albida, a leguminous tree promoted as part of the CA package in Zambia, is associated with significantly higher levels of nitrogen, organic carbon and potassium under its canopy. Its planting by CA farmers is linked to the incentives provided by CA promoters. Average maize yields of 3.8 t ha-1 and 2.8 t ha-1 were reported under CA and CV systems respectively. Government subsidies for mineral fertilizer and hybrid seed promote maize mono-cropping and remain unsupportive of CA. It is concluded that the dominant land degradation narrative, which posits population induced land degradation, may not hold in this case. Instead, the removal of crop residues and low levels of mineral fertilizer and manure amendments may better explain the soil fertility status of the study areas. More nutrient replacement strategies are required if the benefits of CA on soil fertility are to be actualized in the immediate future.

Suggested Citation

  • Bridget, Bwalya Umar, 2012. "Reversing Agro-Based Land Degradation through Conservation Agriculture: Emerging Experiences from Zambia’s Smallholder Farming Sector," Sustainable Agriculture Research, Canadian Center of Science and Education, vol. 1(2).
    • Handle: RePEc:ags:ccsesa:231357
    DOI: 10.22004/ag.econ.231357
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    References listed on IDEAS

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    2. World Bank, 2010. "Zambia - Impact Assessment of the Fertilizer Support Program : Analysis of Effectiveness and Efficiency," World Bank Publications - Reports 2878, The World Bank Group.
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    4. Barbier, Edward B., 2000. "Links between economic liberalization and rural resource degradation in the developing regions," Agricultural Economics, Blackwell, vol. 23(3), pages 299-310, September.
    5. Zhiying Xu & William J. Burke & Thomas S. Jayne & Jones Govereh, 2009. "Do input subsidy programs “crowd in” or “crowd out” commercial market development? Modeling fertilizer demand in a two‐channel marketing system," Agricultural Economics, International Association of Agricultural Economists, vol. 40(1), pages 79-94, January.
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