An approach to combining remote sensing spectral measurements with an ecosystem process model is presented. In this approach, the ecosystem model is not bound by the sole use of satellite data, but integrates the latter in an explicit formulation of the main processes of vegetation functioning. A...
Mougin, E.
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Seen, D. lo
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Rumbal, S.
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Gaston, A.
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Hiernaux, Pierre H.Y.
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[A regional sahelian grassland model to be coupled with multispectral satellite data. I. Model description and validation]
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A regional sahelian grassland model to be coupled with multispectral satellite data. I. Model description and validation
We considered the analysis of a study for Dorper, Red Maasai and crossbred lambs born over a period of 6 years at the Diani Estate, Kenya. The study was designed to compare survival and performance traits of genotypes with differing susceptibilities to helminthiasis. The available data include in...
Nguti, R.
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Burzykowski, T.
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Rowlands, G.J.
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Renard, D.
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Janssen, P.
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[Joint modelling of repeated measurements and event time: Application to performance traits and survival of lambs bred in sub-humid tropics]
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Joint modelling of repeated measurements and event time: Application to performance traits and survival of lambs bred in sub-humid tropics
Records from 1577 cows borm from 1973 to 1983 on a ranch in lowland Kenya were analyzed for age at first calving, lactation length, lactational milk yield, calving interval, annual milk yield, and, for cows born from 1973 to 1979, number of calvings, productive lifetime in the herd, and lifetime ...
Thorpe, W.R.
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Morris, C.A.
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Kang'ethe, P.
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[Crossbreeding of Ayrshire, Brown Swiss, and Sahiwal cattle for annual and lifetime milk yield in the lowland tropics of Kenya]
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Crossbreeding of Ayrshire, Brown Swiss, and Sahiwal cattle for annual and lifetime milk yield in the lowland tropics of Kenya
Assessments of the stability as well as the performance of plant genotypes across diverse environmental conditions are important to plant breeders and agronomists as tools for selecting superior cultivars for the target environments. In this study, the shortcomings of fitted response as an indica...
Kamidi, R.E.
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[Relative stability, performance, and superiority of crop genotypes across environments]
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Relative stability, performance, and superiority of crop genotypes across environments
A static model for predicting either the growth rates or digestible organic matter (DOMI) required to meet predetermined levels of growth is developed. Parameters in the model were derived using data collected in ILRI-DZ laboratory from 6 growth studies (involving a total of 242 Ethiopian Menz sh...
Land degradation in the form of soil erosion and nutrient depletion presents a threat to food security and sustainability of agricultural production in many developing countries. Governments and development agencies have invested substantial resources to promote soil conservation practices as par...
Kassie, M.
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Pender, J.L.
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Yesuf, M.
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Kohlin, G.
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Bulffstone, R.
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Mulugeta, E.
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[Estimating returns to soil conservation adoption in the northern Ethiopian highlands]
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Estimating returns to soil conservation adoption in the northern Ethiopian highlands
Pastoral communities in East Africa are facing considerable challenges arising from shifts in land tenure policy from communal to individual landholdings and high human population growth rates. Over the last 30 years, livestock-to-human ratios have generally declined to levels that will no longer...
Thornton, Philip K.
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BurnSilver, S.B.
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Boone, Randall B.
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Galvin, K.A.
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[Modelling the impacts of group ranch subdivision on agro-pastoral households in Kajiado, Kenya]
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Modelling the impacts of group ranch subdivision on agro-pastoral households in Kajiado, Kenya
Estimates of factors influencing Cameroon's exports of cocoa, coffee and cotton are derived in a system of equations using the Engle-Granger and Johansen co-integration and error-correction representation procedures. Two co-integrating vectors involving cocoa and coffee exports as endogenous vari...
Tambi, N.E.
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[Co-integration and error-correction modelling of agricultural export supply in Cameroon]
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Co-integration and error-correction modelling of agricultural export supply in Cameroon
The vast majority of farmers in sub-Saharan Africa depend on rainfed agriculture for food production and livelihood. Various factors including but not limited to rainfall variability, land degradation, and low soil fertility constrain agricultural productivity in the region. The objectives of thi...
Worqlul, A.W.
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Dile, Y.T.
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Schmitter, Petra
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Jeong, J.
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Meki, M.N.
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Gerik, T.J.
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Srinivasan, R.
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Lefore, Nicole
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[Water resource assessment, gaps, and constraints of vegetable production in Robit and Dangishta watersheds, Upper Blue Nile Basin, Ethiopia]
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Water resource assessment, gaps, and constraints of vegetable production in Robit and Dangishta watersheds, Upper Blue Nile Basin, Ethiopia
This paper assesses the potential impact of planting of eucalypt trees as a strategy to reduce poverty in a less-favoured area of the highlands of Ethiopia. Results from simulations with a bio-economic model for a less-favoured case study area in the highlands are combined with survey data at com...
Holden, S.
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Benin, S.E.
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Shiferaw, B.
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Pender, J.L.
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[Tree planting for poverty reduction in less-favored areas of the Ethiopian highlands]
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Tree planting for poverty reduction in less-favored areas of the Ethiopian highlands