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CABI Book Chapter

Crop improvement, adoption, and impact of improved varieties in food crops in sub-Saharan Africa.

Book cover for Crop improvement, adoption, and impact of improved varieties in food crops in sub-Saharan Africa.

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Chapter 4 (Page no: 35)

Coverage, data and methods in assessing the performance of food crop improvement in sub-Saharan Africa.

This chapter was written to provide a reference for readers who want to understand the context underlying the substantive results reported in this volume. It describes the data and how they were collected. The Diffusion and Impact of Improved Varieties in Africa (DIIVA) Project aims to provide comprehensive information on the geographical spread of improved crop varieties in sub-Saharan Africa as well as information on inputs, outputs and outcomes associated with diffusion of modern varieties. Data collection began in 2010 and continued into 2012. This chapter uses 2010 as the point of the reference to describe the DIIVA data set. The DIIVA data can be divided into three domains: assembled data on scientific capacity and varietal release/availability; elicited estimates of varietal adoption; and household survey data. Data were assembled from existing sources on scientific capacity in 2010 and on improved varietal output from 1970 to 2010. Other than the need for intensive in-country interaction and supervision, these data on inputs and outputs did not entail any notable methodological difficulties because participants followed consensus guidelines described later in this chapter. The project settled on expert opinion panels to obtain estimates of improved variety adoption. Reasons for this choice and the process of how those estimates were generated receive considerable attention in this chapter. Before describing the assembly of data on scientific inputs and varietal output, the methods used eliciting expert opinion on varietal adoption, and the content of the household surveys, crop and country coverage are briefly presented.

Other chapters from this book

Chapter: 1 (Page no: 1) The importance of generating and documenting varietal change in sub-Saharan Africa. Author(s): Walker, T. S. Alwang, J.
Chapter: 2 (Page no: 7) Investments in and impacts of crop improvement research in Africa. Author(s): Alwang, J.
Chapter: 3 (Page no: 24) Relevant concepts and hypotheses in assessing the performance of food crop improvement in sub-Saharan Africa. Author(s): Walker, T. S.
Chapter: 5 (Page no: 44) Genetic improvement of the crops in the 1998 initiative: historical context and exploratory analysis. Author(s): Walker, T. S.
Chapter: 6 (Page no: 74) The effectiveness of crop improvement programmes from the perspectives of varietal output and adoption: cassava, cowpea, soybean and yam in sub-Saharan Africa and maize in West and Central Africa. Author(s): Alene, A. D. Abdoulaye, T. Rusike, J. Manyong, V. Walker, T. S.
Chapter: 7 (Page no: 123) Assessing the effectiveness of agricultural R&D for groundnut, pearl millet, pigeonpea and sorghum in West and Central Africa and East and Southern Africa. Author(s): Ndjeunga, J. Mausch, K. Simtowe, F.
Chapter: 8 (Page no: 148) The performance of bean improvement programmes in sub-Saharan Africa from the perspectives of varietal output and adoption. Author(s): Muthoni, R. A. Andrade, R.
Chapter: 9 (Page no: 164) The effectiveness of potato and sweetpotato improvement programmes from the perspectives of varietal output and adoption in sub-Saharan Africa. Author(s): Labarta, R.
Chapter: 10 (Page no: 183) Evaluating the key aspects of the performance of genetic improvement in priority food crops and countries in sub-Saharan Africa: the case of rice. Author(s): Diagne, A. Kinkingninhoun-Medagbe, F. M. Amovin-Assagba, E. Nakelse, T. Sanni, K. Toure, A.
Chapter: 11 (Page no: 206) Assessing the effectiveness of maize and wheat improvement from the perspectives of varietal output and adoption in East and Southern Africa. Author(s): Groote, H. de Gitonga, Z. Mugo, S. Walker, T. S.
Chapter: 12 (Page no: 228) Varietal output and adoption in barley, chickpea, faba bean, field pea and lentil in Ethiopia, Eritrea and Sudan. Author(s): Yigezu, Y. A. Yirga, C. Aw-Hassan, A.
Chapter: 13 (Page no: 239) Scientific strength in rice improvement programmes, varietal outputs and adoption of improved varieties in South Asia. Author(s): Pandey, S. Velasco, M. L. Yamano, T.
Chapter: 14 (Page no: 265) Analysing scientific strength and varietal generation, adoption and turnover in Peninsular India: the case of sorghum, pearl millet, chickpea, pigeonpea and groundnut. Author(s): Charyulu, D. K. Bantilan, M. C. S. Laxmi, A. R. Moses, D. S.
Chapter: 15 (Page no: 294) Maize technologies and rural poverty reduction in Ethiopia. Author(s): Zeng, D. Alwang, J. Norton, G. W. Shiferaw, B. Jaleta, M. Yirga, C.
Chapter: 16 (Page no: 314) Impacts of improved bean varieties on poverty and food security in Uganda and Rwanda. Author(s): Larochelle, C. Alwang, J. Norton, G. W. Katungi, E. Labarta, R. A.
Chapter: 17 (Page no: 338) The diffusion and impact of improved food crop varieties in sub-Saharan Africa. Author(s): Fuglie, K. Marder, J.
Chapter: 18 (Page no: 370) Varietal generation and output. Author(s): Walker, T. S. Alene, A. Ndjuenga, J. Labarta, R. Yigezu, Y. Diagne, A. Andrade, R. Andriatsitohaina, R. M. Groote, H. de Mausch, K. Yirga, C. Simtowe, F. Katungi, E. Jogo, W. Jaleta, M. Pandey, S. Charyulu, D. K.
Chapter: 19 (Page no: 388) Varietal adoption, outcomes and impact. Author(s): Walker, T. S. Alwang, J. Alene, A. Ndjuenga, J. Labarta, R. Yigezu, Y. Diagne, A. Andrade, R. Andriatsitohaina, R. M. Groote, H. de Mausch, K. Yirga, C. Simtowe, F. Katungi, E. Jogo, W. Jaleta, M. Pandey, S. Charyulu, D. K.
Chapter: 20 (Page no: 406) Validating adoption estimates generated by expert opinion and assessing the reliability of adoption estimates with different methods. Author(s): Walker, T. S.
Chapter: 21 (Page no: 420) Implications for monitoring progress and assessing impacts. Author(s): Alwang, J.