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Demographic parameters are useful for assessing productivity and dynamics of tropical livestock populations. Common parameters are the annual instantaneous hazard rates, which can be estimated by m/T (where m represents the number of the considered demographic events occurred during the year and ...


Lesnoff, Matthieu[Evaluation of 12-month interval methods for estimating animal-times at risk in a traditional African livestock farming system]Evaluation of 12-month interval methods for estimating animal-times at risk in a traditional African livestock farming system
Autor: Shanley, P.

Increased trade in non-timber forest products (NTFP) has been promoted as one possible means to slow tropical deforestation by increasing the economic value of intact forest. A market surcey of NTFP's occuring in the Capim River basin in eastern Amazonia, Brazil demonstrated that the realitty for...


Shanley, P.[The faint promise of a distant market: a survey of Belem's trade in non-timber forest products]The faint promise of a distant market: a survey of Belem's trade in non-timber forest products

The paper presents a new and versatile sample unit suitable for rapid assessments of tropical forest in heterogeneous areas. The method uses multiple applications of small and easy-to-apply variable subunits. Compared with any fixed-area approach the sample unit is quick and easy to apply even in...


Sheil, DouglasDucey, M.J.Sidiyasa, K.D.Samsoedin, I.[A new type of sample unit for the efficient assessment of diverse tree communities in complex forest landscapes]A new type of sample unit for the efficient assessment of diverse tree communities in complex forest landscapes
Garming, H.Espinosa, J.Guardia, S.Jiménez, R.Instituto de Investigacion Agropecuaria de PanamaCentro Agronomico Tropical de Investigacion y EnsenanzaInstituto Dominicano de Investigacion Agropecuaria y Forestal[Large-scale adoption of improved plantains: the impact of FHIA-21 in the Dominican Republic]Large-scale adoption of improved plantains: the impact of FHIA-21 in the Dominican Republic
Nolt, Barry L.Pineda López, BenjamínVelasco, Ana Cecilia[Surveys of cassava plantations in Colombia for virus and virus- like diseases]Surveys of cassava plantations in Colombia for virus and virus- like diseases

International research for development is under increasing pressure to demonstrate development outcomes that enhance people’s food security and well-being while preserving the natural resource base. The CGIAR Research Programme on Climate Change, Agriculture and Food Security (CCAFS) integrates t...


Förch, WiebkeKristjanson, Patricia M.Cramer, LauraBarahona, C.Thornton, Philip K.[Back to baselines: measuring change and sharing data]Back to baselines: measuring change and sharing data

Drawing on results of a survey of Ugandan farmers who previously hosted bean (Phaseolus vulgaris L.) varietal trials, this paper reports on the adoption of three new bush bean cultivars and assesses the usefulness of post-trial surveys as a methodology for obtaining reliable early feedback on var...


David, S.Wortmann, Charles S.Kasozi, SMugisha-Mutetikka, M[Using trial follow-up surveys to assess varietal adoption: The case of beans]Using trial follow-up surveys to assess varietal adoption: The case of beans

Strong gradients of decreasing soil fertility are found with increasing distance from the homestead within smallholder African farms, due to differential resource allocation. As nutrient use efficiency varies strongly along these gradients, such heterogeneity must be considered when designing soi...


Tittonell, Pablo A.Vanlauwe, BernardLeffelaar, P.A.Shepherd, Keith D.Giller, Ken E.[Exploring diversity in soil fertility management of smallholder farms in western Kenya. II. Within-farm variability in resource allocation, nutrient flows and soil fertility status]Exploring diversity in soil fertility management of smallholder farms in western Kenya. II. Within-farm variability in resource allocation, nutrient flows and soil fertility status

This paper evaluates the determinants of decision-making in relation to the production of four crops (banana, cassava, potato, and sweet potato). Understanding the division of labor and decision-making in crop management may lead to designing better interventions targeted at improving efficiency ...


Okonya, J.S.Mudege, Netsayi N.Rietveld, A.M.Nduwayezu, A.Kantungeko, D.Hakizimana, B.M.Nyaga, J.N.Blomme, GuyLegg, J.P.Kroschel, J.[The role of women in production and management of RTB crops in Rwanda and Burundi: Do men decide, and women work?]The role of women in production and management of RTB crops in Rwanda and Burundi: Do men decide, and women work?

We ecologists realize that individually we have a variety of interests, knowledge, and skills among us; and we appreciate how those attributes differentially apply to the diverse tasks we address in our various “practices” of ecology. Less obvious to us, however, is the variety of intellectual to...


Reiners, William A.Pappas, Gregory S.Lockwood, Jeffrey A.Reiners, Derek S.Prager, Steven D.[Conceptual toolboxes for twenty-first-century ecologists]Conceptual toolboxes for twenty-first-century ecologists

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