A theory-based evaluation of the Agroforestry Food Security Programme, Phase II in Malawi (AFSPII): Lessons for Scaling Up Complex Agronomic and Natural Resource Management Practices Developed and Tested in Research Settings

This study sought to evaluate the impacts of World Agroforestry’s (ICRAF) Agroforestry Food Security Programme, Phase II (AFSPII) in Malawi (2012-2016). Given the absence of a well-planned impact evaluation strategy, a quasi-experimental design grounded in AFSPII’s theory of change was designed to take advantage of this programme’s geographically staggered roll-out. This was complemented by semi-structured interviews with 40 programme participants and discussions with district-level implementing partners to corroborate the results. The rigour of this evaluation strategy was undermined by the fact that many in the planned comparison group—participants residing in purposively matched villages engaged in AFSPII during its third year—had actually commenced their participation in the first year. Since many participants interviewed in Years 1 and 3 actually resided in the same villages, comparing the two was problematic because: (i) they likely differed in both observable and unobservable ways relevant to the study’s outcomes of interest; and (ii) the Year 3 participants from these villages may have been influenced by their interactions with Year 1 participants. This issue was exacerbated by the fact that only 53% of the targeted sample size was attained and baseline data could only be reconstructed for a few key variables (e.g. household assets). While several econometric models were used to control for observable differences between the two groups, these limitations are explicitly recognized. Nevertheless, several relevant lessons were generated, particularly from the study’s examination of the uptake of promoted agroforestry practices among AFSPII participants, as well as the contextual factors influencing this. Only a small proportion of these participants were able to realize the targets set for the four promoted agroforestry practices. For example, for the programme’s core intervention—fertilizer tree promotion—only 14% of the Year 1 participants incorporated either a moderate or significant amount of fertilizer tree biomass into their fields prior to maize planting in both Years 2 and 3. It is therefore unsurprising that no significant average differences for the various outcome and impact measures were found in the comparison of Year 1 (n=402) and Year 3 (n=229) participants, except for a modest decrease in time spent collecting firewood. The study concludes with three recommendations: (1) Build in systematic provisions for participatory monitoring, follow-up support, and adaptive management when scaling complex agronomic and natural resource management interventions. (2) Expand the research cycle to encompass the scaling effort, particularly when there is uncertainty about technology and practice uptake or performance, including how they interact with the socio-economic and biophysical characteristics of “real world” settings. (3) Ensure that an appropriate impact evaluation strategy is pursued from the outset, viewing it as an integral part of the larger research effort.

Planning technical interventions in agroforestry projects

In agroforestry projects careful planning and design of technologies is necessary because of the complex nature of agroforestry and the lack of proven technology ‘packages’. To identify appropriate methodologies, ICRAF conducted in 1988/89 a review of agroforestry technology monitoring and evaluation in 165 projects worldwide. Approximately half of the projects that responded to the review had carried out technology planning and design activities. The spectrum of information needs, which includes needs assessment, biophysical site description, agroforestry opportunities and existing information was inadequately covered by most projects. Statistically designed and questionnaire-based farmer surveys were favoured by projects although a range of more appropriate approaches and methods for technology planning and design exists. A planning approach is suggested that includes a pilot phase during which initial technology designs are developed and tested with farmers. Projects are encouraged to use more cost-effective, non-statistical methods. The authors recommend improvements to technology planning/design methods and identify training needs for project managers and extension staff.

Live fences in Ségou, Mali : an evaluation by their early users

Market-oriented production of gardening crops and cassava (Manihot utilissima) in the dry season is an increasingly frequent practice in Ségou, Mali. Traditionally, these crops are protected from roaming livestock with the help of dead fences. In order to provide a sustainable alternative to dead fences, the International Centre for Research in Agroforestry (ICRAF) began promoting the use of live fences, living trees planted closely together around a field plot. This study was conducted with the first farmers to use these live fences. These farmers expressed satisfaction with the protection offered by the trees and their ability to provide a variety of medicinal, economic, and food products. The form of land tenure, the social status of farmers within their families, and the availability of labour seem to be important factors in the decision to test the live fence. This raises questions about the accessibility of this technique and its possible contribution to the social and economic differentiation of its users.

Technology impact evaluation in agroforestry projects

To identify appropriate methods for evaluating the impact of new agroforestry technologies, ICRAF in 1988–89 contacted 166 projects worldwide about their activities in agroforestry technology monitoring and evaluation. Of the 108 which responded, 45% were involved in some type of impact evaluation. This review revealed common difficulties in selecting impact indicators and methods of evaluation. Emphasis to date has been on evaluating numbers of trees planted and area under agroforestry, rather than socioeconomic impacts. Defining agroforestry adoption and distinguishing intermediate and final impacts were problematic. Impact studies were often difficult to interpret or compare, limiting their value for the rest of the agroforestry community. An analytical framework for planning impact evaluation in agroforestry projects is proposed, based on lessons learned from the review. Selection of indicators should depend upon whether project objectives relate to changes in: number and type of trees grown, land use, farmer knowledge and attitudes, availability of agroforestry products and services, and/or socioeconomic welfare. Data collection tools may include sequential photography or mapping, informal or formal farmer surveys, informal or formal field surveys, farmer meetings and workshops, trend analysis of project records, and case studies of households or communities, depending upon the audience for project evaluation and project resources.

Farmer assessment and economic evaluation of shrub fallows in the Humid Lowlands of Cameroon

Food crop production in highly populated areas around major cities of the humid lowlands of Cameroon is highly dependent on a fallow system (two–four years duration) mainly of Chromolaena odorata. Where such fallows have been in use for some time, problems of soil fertility with declining crop yields and higher incidence of weeds were reported. Although improved fallows have been widely adopted in sub-humid zones, there is no evidence of successful adoption of agroforestry-based technologies for soil fertility improvement in the humid forest areas. In response, ICRAF has developed a short fallow system with Cajanus cajan for soil fertility improvement in the humid lowlands of West Africa. Farmers’ response to these cajanus fallows is positive. Benefits reported are higher crop yields after cajanus fallows compared to natural fallows, clearing of cajanus is easier and the shrubs shade out the weeds. Women particularly appreciate the technology for its low labour demand and for the fact that these shrubs can be planted on land with less secure tenure. Economic analysis of cajanus fallows compared to natural fallow over six years shows that cajanus fallows are profitable under most tested scenarios, both in terms of returns to land and to labour. It seems that improved fallows with Cajanus cajan are a good response to shortening natural fallows for households in the humid lowlands of Cameroon with land constraints. However, wider dissemination of the technology requires a targeted extension approach and adequate seed supply strategies, which should be based on joint efforts between farmers, extension services and research.

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