Título:	A parsimonious crop-water productivity index: an application to Brazil.
Autoria:	MANETA, M. P. SINGH, P. N. TORRES, M. WALLENDER, W. W. VOSTI, S. A. RODRIGUES, L. N. BASSOI, L. H. YOUNG, J. A.
Afiliação:	MARCO P. MANETA, UNIVERSITY OF CALIFORNIA PURNENDU N. SINGH, UNIVERSITY OF CALIFORNIA MARCELO TORRES, UNIVERSITY OF CALIFORNIA WESLEY W. WALLENDER, UNIVERSITY OF CALIFORNIA STEPHEN A. VOSTI, UNIVERSITY OF CALIFORNIA LINEU NEIVA RODRIGUES, CPAC LUIS HENRIQUE BASSOI, CPATSA JULIE A. YOUNG, UNIVERSITY OF CALIFORNIA.
Ano de publicação:	2009
Referência:	Area, v. 41, n. 1, p. 94-106, 2009.
Conteúdo:	Reducing poverty in rural areas of developing countries requires sustained and sustainable increases in agricultural water productivity. However, aside from traditional measures of precipitation, little is known about water available to farmers or how productively they use it. We present a crop-water productivity index (a ratio of the value of annual crop production to a dimensionless potential water availability index) for large water basins using readily available low-resolution data. The index is transferable, permits direct inter-basin comparisons, and is simple to calculate. We calculate the index for each municipality in the São Francisco river basin in Brazil. No clear patterns linking water availability and value of agricultural output are evident, even though clusters of municípios with high- and low-crop-water productivity emerge, and the former may be useful in guiding policies aimed at increasing water productivity. Finally, analyses of the effects of information uncertainty on the crop-water productivity index suggest that the returns to agricultural investments in certain places in the São Francisco river basin are more risky than others. Improvements in data quality and quantity can help refine estimates of the index and reduce their uncertainty. Key words: water productivity, irrigation, agricultural productivity, crop-water productivity index, water availability index, uncertainty propagati
Thesagro:	Irrigação Bacia Hidrográfica Desenvolvimento Agrícola Manejo de Água Sistema de Cultivo
NAL Thesaurus:	Irrigation
Palavras-chave:	Produtividade agrícola Produtividade hídrica Índice de produtividade
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPATSA)