Conservation agriculture in Central Asia—What do we know and where do we go from here?

Abstract Rainfed and irrigated agricultural systems have supported livelihoods in the five Central Asian countries (CAC) for millennia, but concerns for sustainability and efficient use of land and water resources are long-standing. During the last 50 years, resource conserving technologies were introduced in large parts of the rainfed areas while the irrigated areas were expanded largely without considering resource conservation. In more recent years, the use of conservation agriculture (CA) practices has been reported for the different agricultural production (AP) zones in CAC, albeit centering on a single AP zone or on single factors such as crop yield, implements or selected soil properties. Moreover, conflicting information exists regarding whether the current practices that are referred to as ‘CA’ can indeed be defined as such. Overall information on an application of CA-based crop management in Central Asia is incomplete. This discussion paper evaluates experimental evidence on the performance of CA and other resource conserving technologies in the three main AP zones of CAC, provides an overview of farmer adoption of production practices related to CA, and outlines technical and non-technical challenges and opportunities for the future dissemination of CA practices in each zone. Agronomic (e.g. implements, crop yields, duration, and crop residues), institutional (e.g. land tenure) and economic (e.g. short vs. long-term profitability) perspectives are considered. At present, adoption of CA-based agronomic practices in the rainfed production zone is limited to partial crop residue retention on the soil surface or sporadically zero tillage for one crop out of the rotation, and hence the use of single CA components but not the full set of CA practices. In the irrigated AP zones, CA is not commonly practiced and many of the pre-conditions that typically encourage the rapid spread of CA practices appear to be absent or limiting. Further, our analysis suggests that given the diversity of institutional, socio-economic and agro-ecological contexts, a geographically differentiated approach to CA dissemination is required in the CAC. Immediate priorities should include a shift in research paradigms (e.g. towards more participatory approaches with farmers), development of commercially available reduced and no-till seeders suitable for smaller-scale farm enterprises, and advocacy so that decision makers understand how different policies may encourage or discourage innovations that lead towards more sustainable agricultural intensification in the CAC.

[1]  Rolf Sommer,et al.  Soils and Soil Ecology in Khorezm , 2012 .

[2]  M. Spoor,et al.  The State of Agrarian Reform in the Former Soviet Union , 2001 .

[3]  E. Pauw,et al.  Organic carbon in soils of Central Asia—status quo and potentials for sequestration , 2010, Plant and Soil.

[4]  D. Mays,et al.  Tillage, Cover Cropping, and Poultry Litter Effects on Cotton: II. Growth and Yield Parameters , 2000 .

[5]  B. Govaerts,et al.  Conventionally Tilled and Permanent Raised Beds with Different Crop Residue Management: Effects on Soil C and N Dynamics , 2005, Plant and Soil.

[6]  William R. Sutton,et al.  Integrating Environment into Agriculture and Forestry: Progress and Prospects in Eastern Europe and Central Asia , 2008 .

[7]  U. Djanibekov,et al.  Prospects of Agricultural Water Service Fees in the Irrigated Drylands Downstream of Amudarya , 2012 .

[8]  Hari Eswaran,et al.  Sustainable Land Management , 2011 .

[9]  R. Derpsch.  Conservation Tillage, No-Tillage and Related Technologies , 2003 .

[10]  Javier M. Ekboir,et al.  CIMMYT 2000-2001 world wheat overview and outlook: developing no-till packages for small-scale farmers , 2002 .

[11]  M. Spoor.  Agrarian transition in former Soviet Central Asia: a comparative study of Kazakhstan, Kyrgyzstan and Uzbekistan , 1999 .

[12]  S. Evett,et al.  Permanent Beds vs. Conventional Tillage in Irrigated Arid Central Asia , 2011 .

[13]  Nodir Djanibekov,et al.  A Micro-Economic Analysis of Farm Restructuring in Khorezm Region, Uzbekistan , 2008 .

[14]  M. M. Alley,et al.  Winter Annual Cover Crops in a Virginia No-till Cotton Production System: II. Cover Crop and Tillage Effects on Soil Moisture, Cotton Yield, and Cotton Quality , 1999 .

[15]  L. Martynova,et al.  Role of Wheat in Diversified Cropping Systems in Dryland Agriculture of Central Asia , 2005 .

[16]  G. Robertson,et al.  Managing soil carbon and nitrogen for productivity and environmental quality , 2004 .

[17]  T. Kosaki,et al.  Dynamics of water and soil organic matter under grain farming in Northern Kazakhstan – Toward sustainable land use both from the agronomic and environmental viewpoints , 2007 .

[18]  K. Sayre,et al.  Research Prospectus: A Vision for Sustainable Land Management Research in Central Asia. , 2009 .

[19]  Peter R. Hobbs,et al.  The Raised Bed System of Cultivation for Irrigated Production Conditions , 2004 .

[20]  Christopher Conrad,et al.  Spatial Distribution of Cotton Yield and its Relationship to Environmental, Irrigation Infrastructure and Water Management Factors on a Regional Scale in Khorezm, Uzbekistan , 2012 .

[21]  Irina Forkutsa,et al.  Water Management in Khorezm: Current Situation and Options for Improvement (Hydrological Perspective) , 2012 .

[22]  W. Pettigrew,et al.  Cotton Growth under No-Till Production in the Lower Mississippi River Valley Alluvial Flood Plain , 2001 .

[23]  P. Vlek,et al.  Cotton, Water, Salts and Soums , 2012, Springer Netherlands.

[24]  A. Noble,et al.  Mulching and water quality effects on soil salinity and sodicity dynamics and cotton productivity in Central Asia , 2010 .

[25]  J. Deckers,et al.  Stable high yields with zero tillage and permanent bed planting , 2005 .

[26]  J. Palutikof,et al.  Climate change 2007 : impacts, adaptation and vulnerability , 2001 .

[27]  R.W.O. Soppe,et al.  Value of water , 2005 .

[28]  B. Bates,et al.  Climate change and water: technical paper of the intergovernmental panel on climate change , 2008 .

[29]  S. Malhi,et al.  Short-term effects of tillage and residue management following cotton on grain yield and quality of wheat , 2010 .

[30]  Hans Tømmervik,et al.  Prediction of the distribution of Arctic‐nesting pink‐footed geese under a warmer climate scenario , 2007 .

[31]  C. Martius,et al.  Methane and nitrous oxide fluxes in annual and perennial land‐use systems of the irrigated areas in the Aral Sea Basin , 2008 .

[32]  U. Bonn.  Potential of Conservation Agriculture for Irrigated Cotton and Winter Wheat Production in Khorezm, Aral Sea Basin , 2009 .

[33]  Rolf Sommer,et al.  Model-based assessment of maize cropping under conventional and conservation agriculture in highland Mexico , 2007 .

[34]  J. Ekboir.  Developing No-Till Packages for Small-Scale Farmers , 2002 .

[35]  Raj Gupta,et al.  Conservation Agriculture in South Asia - Some Lessons Learnt , 2008 .

[36]  P. Hobbs,et al.  Conservation Agriculture : What Is It and Why Is It Important for Future Sustainable Food Production ? , 2006 .

[37]  J. Lamers,et al.  Mapping and Analyzing Service Provision for Supporting Agricultural Production in Khorezm, Uzbekistan , 2012 .

[38]  K. Giller,et al.  Conservation agriculture and smallholder farming in Africa: The heretics' view , 2009 .

[39]  Jeffrey P. Mitchell,et al.  Classification of Conservation Tillage Practices in California Irrigated Row Crop Systems , 2009 .

[40]  Sarah E. Kienzler,et al.  Introducing Conservation Agriculture on Irrigated Meadow Alluvial Soils (Arenosols) in Khorezm, Uzbekistan , 2012 .

[41]  R. Lal,et al.  Tillage effect on nutrient uptake by wheat and cotton as influenced by fertilizer rate , 2001 .