Household Determinants and Impact of Soil and Water Conservation Practices in the Blue NilePresentation Transcript
Household Determinants and Impact of Soil and Water Conservation Practices in the Blue Nile Emily Schmidt (IFPRI) Fanaye Tadesse (IFPRI) Ministry of Agriculture October 27th, 2011
The Blue Nile (Abbay) Basin• Although Ethiopia’s biophysical potential is significant, land degradation and poverty continue to challenge sustainable agricultural development opportunities (studies on this include: Desta, et al. (2001); Shiferaw and Holden (2001); Tefera, et al. (2002); Zeleke and Hurni (2002); Okumu et al. (2002); Sonneveld (2002)).• This is further aggravated by high population pressure in rural highlands, climatic variability, limited use of sustainable land management practices, and a high dependence on rain-fed agriculture.• The on-site effects of land degradation (eg. erosion and loss of top soil), measured in lost agricultural production is estimated to cost 2 to 6.75% of AGDP per annum (Mahmud, et al. 2005)
Policies for addressing SLM strategies• Previous 5 year plan (PASDEP): series of land and watershed management activities with the goal of augmenting agricultural production. – piloting and implementing community-based approaches to SLM – scaling up successful models for watershed management – strengthening natural resource information management and M&E• Recent 5 year plan (GTP): government outlines the need to promote and invest in SWC moisture retaining taking into account varying agro ecological zones (GTP, 2011).• CAADP includes a major emphasis SLM as part of Pillar I. – reversing fertility loss and resource degradation, – supporting the rapid adoption of SLM practices; – and improving management of water resources.• Sustainable Land Management (SLM) Program in collaboration with MOA and other donors
Study focus: Blue Nile (Abbay) Basin• Assess the determinants of adoption of soil and water conservation (SWC) structures• Evaluate SWC private adoption impact on value of production per hectare• Understand time horizon of impact (how long does it take to experience a benefit)• Future: Explore policy options for incentivizing local investment and up-scaling of sustainable land watershed management activities – Greater cost effectiveness, scalability, and sustainability?
Sample Selection• 9 woredas (1810 HHs) within the Blue Nile Basin (*note: this survey is not nationally representative)• Stratification: Random sample within woredas that have a recently started or planned SLM program (SLMP – GIZ and World Bank) – 3 sites (kebeles) per woreda (SLMP woredas) • Past or Ongoing program • GIZ Planned program (for 2011) • No formal past program• Nile Basin Development Challenge (NBDC) woredas: 4 sites within each woreda / watershed – 2 upstream from instrumentation – 2 downstream from instrumentation
Watershed Survey Sample Sites
Broad Overview of Survey Sample9 woredas: 5 Amhara, 4 Oromiya – Teff as leading crop (4 woredas in Amhara) • Fogera • Gozamin • Toko Kutaye • Misrak Este – Maize • Mene Sibu (Oromiya) • Diga (Oromiya) • Alefa (Amhara) – Wheat / other • Dega Damot (Amhara) • Jeldu (Oromiya)• Substantial diversity across woredas in terms of cropping patterns, production patterns, agricultural activity
Cropping Patterns of Sample (5 main cereals and potatoes) Mean hectares Share of % farmers of farmersCrop Total Hectares area growing crop growing cropteff 719.9 25.8% 55.3% 0.719barley 431.3 15.5% 45.9% 0.520wheat 363.7 13.0% 42.5% 0.473maize 818.9 29.3% 64.4% 0.703sorghum 319.5 11.5% 27.9% 0.633potatoes 136.8 4.9% 30.7% 0.246Total 2,790.1 100.0% -- --
Ongoing SLM activities (2) Percent of households reporting activities implemented in the village2520151050
Ongoing SLM activities (3)Households who received assistance by type of supportType of support Freq Percent.Advice on how to construct bunds or terraces for soil conservation 1,107 61%Advice on when to apply fertilizer 1,092 60%Advice on how to apply fertilizer 1,086 60%Advice on how to build drainage to reduce erosion 1,085 60%Assistance in obtaining fertilizer 1,031 57%Advice on the best time to plant crops 947 52%Assistance in obtaining improved seeds 920 51%Suggest new crops to grow 913 50%Advise on procurement of livestock vaccines 783 43%Advice or support of other veterinary services, including medicines 740 41%Advice on the construction of irrigation or water harvestingsystems 705 39%Advice on how best to deal with insect infestations 689 38%
Perception of SLM activities Most Important type of Infrastructure Built (Percent of total households) 40 30 20 10 0
Perception of SLM activities (2) Most Successful Sustainable Land Management activities (%) 40 35 30 25 20 15 10 5 0 stone soil bund check dam trees drainage grass strips terrace planted ditch
Perception of SLM activities (3) Household preference for future infrastructure (%) 25 20 15 10 5 0
Impact Analysis• Nearest Neighbor Matching: measure the impact of adopting specific SLWM technologies on value of production and livestock holdings (match adopters vs. non-adopters) based on observable characteristics• Continuous Treatment Effect Estimation: estimate the benefit (increase in value of prodution) given the number of years adopters maintain SWC structures on their private land (within adopters)
• Definition of SWC Adopters: – Households that implemented • Terraces • Bunds • Check dams on at least 1/3 of private land within the last 15 years (1994-2009) = 24% of sample• Definition of Value of Production: – The total value of all crops harvested in Meher 2001 EC (2009-2010) per household
Determinants of Household ParticipationVariable (only significant variables shown here) dy/dx Std. Err.HH head age (years) -0.013 ** (0.005)HH head age sq. 0.000 * (0.000)Land size in hectares 0.019 ** (0.009)Land size sq. -0.001 (0.000)Household experienced flood and erosion (yes=1) 0.081 ** (0.034)Slope (omitted=flat slope) Steep slope (percentage of plots with steep slope) 0.159 *** (0.055) Mixed slope (percentage of plots with mixed slope) 0.056 (0.077)Fertilizer use (yes=1) 0.061 ** (0.028)Soil Quality (Omitted=fertile land) Semi-fertile land (percentage of plots that are semi-fertile) 0.066 *** (0.041) Non fertile land (percentage of plots that are not fertile) 0.149 * (0.050)Agroecological Zone (Omitted=Dega: mid-highlands 2,300-3,200m.) Kolla (lowlands: 500 – 1,500m.) -0.181 *** (0.026) Woina Dega (low-highlands: 1,500 – 2,300m.) -0.176 *** (0.052) Wurch (mid-highlands: 3,200 – 3,700m.) 0.282 * (0.157)Kilometer distance from city of at least 20,000 people -0.010 *** (0.003) Number of observations=1256 Prob > chi2 =0 Pseudo R2 =0.2480
Percent of total plots under SLWM on private land (1944-2009 )201816141210 8 6 4 2 0
Nearest Neighbor Matching – split sample Outcome Variable ATT Observations 1992-2002 (1985 – 1995 E.C.) Value of Agricultural Production 0.152 ** 1373 (0.071) Livestock value (in Birr) -0.429 1318 (.100) 2003-2009 (1996 – 2002 E.C.) Value of Agricultural Production -0.015 1397 (0.062) Livestock Value (in Birr) -0.158 1327 (0.095)• Households that adopted SLWM on their private land in the first10 years of analysis have 15.2% (2,329 birr avg.) greater value ofproduction in 2010 than non-adopters.
Early adopters show significant increases in value of production, but how long does it take?• We want to understand when households experience asignificant increase in value of production, and how longthey need to maintain this infrastructure in order to do so•We also want to understand how much benefit does ahousehold gain by maintaining a structure another year
Estimated Treatment Level Function E[lnvalueprod(t+1) - E[lnvalueprod(t)] 0.2 Level of 0.15 treatment Marginal 0.1 (years) effect 0.05 7 0.03 8 0.04 0 Treatment range 9 0.05 -0.05 with statistically 10 0.07 significant impact 11 0.08 -0.1 12 0.09 -0.15 13 0.11 1 3 5 7 9 11 13 15 17 14 0.12 Treatment Level 15 0.14• On average, a household must maintain SWC structures for at least 7 years inorder to experience a significant increase in value of production.• Well maintained SWC structures may slow ongoing degradation in the initial yearsof maintenance, but nutrient build-up may take time to show significant impact onvalue of production
Conclusions• Households with poorer quality of soil, steeper slopes, and experience erosion or flooding are more likely to invest in SLWM – Agricultural extension and SWC program targeting may be well placed• Remoteness has a significant but small correlation with household probability of adopting SLWM. – If farmers do not see a marketable outlet for increased production, they may be less willing to implement yield increasing strategies – SLM extension programs in remote areas may have lagged behind• Those that invest in fertilizer are also more likely to invest – Proxy willingness to invest in technologies / innovation to increase output. – In fact, those that put fertilizer on their plots are 6 percent more likely to adopt SLWM technology as well.
Conclusions (2)• Households that construct and sustain SWC for at least 7 years experience higher value of production in the medium term – Unlike technologies such as fertilizer or improved seeds, benefits realized from constructing SLWM structures may accrue over longer time horizons.• A mixture of strategies may reap quicker benefits – Although soil bund, stone terraces, and check dams were identified as the three most important conservation measures, they may not give desired results by themselves in the short run – Physical SWC measures may need to be integrated with soil fertility management (composting, cover crops, fertilizer application etc.) and moisture management (mulching, deep ploughing, etc)
Conclusions (3)• The longer one sustains SWC, the higher the marginal benefit of sustaining an extra year of activity. – Well maintained SWC structures would begin to slow ongoing degradation in the initial years of maintenance, but nutrient build- up may take more time to show significant impact on value of production.• Although the marginal benefit increases with each additional year that the structure is maintained, we assume that these benefits may plateau at a certain treatment level. – As nutrient repletion and erosion control is successful, we would expect to see diminishing returns as the necessary biophysical components are replaced.
Next Steps.Further collaboration:• Nile Basin Development Challenge (N2 and N3) – Development trajectories in Ethiopia: analysis of socio-economic impacts and land cover change • Lisa Rebello, Katherine Snyder, Fanaye Tadesse, Emily Schmidt• Possible second round of survey with GIZ (June/July 2012)