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Papers by Erick Fernandes
Biodiversity and Conservation, 2013
Cattle production on Brachiaria pastures is a primary use of cleared forestland in the western Br... more Cattle production on Brachiaria pastures is a primary use of cleared forestland in the western Brazilian Amazon. About 6.8 million hectares in the States of Acre and Rondônia have been deforested, where 75% of land is now grazed (IBGE, 1998). The principal pasture species are B. brizantha and B. decumbens with the latter in decline from spittlebug susceptibility (Deois incompleta; Gonçalves et al., 1996). The general pattern of pasture establishment in the Amazon basin includes felling and burning forest biomass, planting annual crops for one to three years (especially on small farms), and then seeding to grasses. The conversion of tropical forest to pasture, the effects of that process on soil properties, and pasture degradation outcomes have been studied in the eastern Amazon region ( Serrao et al., 1978; Reiners et al., 1994; Sanchez and Salinas, 1981; Buschbacher et al., 1987; Moraes et al., 1996) but not in the remote western region. Most findings showed an initial increase in ...
The impacts of climate change on agriculture are projected to be significant in coming decades, s... more The impacts of climate change on agriculture are projected to be significant in coming decades, so response strategies and their likely costs should be evaluated now. Robust crop models are needed to estimate those impacts on agricultural productivity regionally, nationally, and even sub- nationally. But existing crop–climate change modeling platforms are not easily accessible to most stakeholders in developing countries. So there is less testing of those models than there might be, and there are fewer opportunities for further improvements based on local tests and emerging data. That is why this study produced an open-access crop-climate-economic impact modeling platform for Latin America and the Caribbean that can be extended to other regions—and modified and improved by users as new crop, climate, and economic datasets become available. The new platform projects the likely impacts of agroclimatic factors on crop productivity on the basis of climate projections from two general ci...
The Agro-ecological Zones Simulator (AZS) is a platform for data and models sharing for scientist... more The Agro-ecological Zones Simulator (AZS) is a platform for data and models sharing for scientists and policy makers, facilitating the analysis of climate change impacts and the identification of possible response strategies through a comprehensive regional-level analysis comprised of: (i) Geo-referenced climate, soil and terrain data, combined into a land resources database;(ii) Crop suitability assessment and land productivity of cropping systems; (iii) Procedures for calculating the potential agronomically attainable yield; (iv) Procedures for computing actual yields as limited by water availability and management, biotic and abiotic factors; and (v) Selected agricultural production systems with defined input and management relationships, crop-specific environmental requirements and adaptability characteristics. The software core of the platform is given by an instance of the BioMA platform. The platform facilitates the evaluation of the impacts of projected changes in temperatur...
Competition for limited water resources and low rice yields in developing countries has renewed t... more Competition for limited water resources and low rice yields in developing countries has renewed the interest in finding better ways to grow more rice with less water. In recent years alternate wet-dry (AWDI) and non-flooded (NF) irrigation have shown promise for reducing water consumption without significant effect on rice grain yield. In 2001, a survey of 109 farmers was conducted
Our objectives were to evaluate strate- gies to improve productivity and economic returns from be... more Our objectives were to evaluate strate- gies to improve productivity and economic returns from beef and dual-purpose cattle systems based on data collected on one dual-purpose (Bostaurus ×Bosindicus) and two beef (Nellore) cattle farms in the western Ama- zon region of Brazil. Forage chemical composition and digestion rates of carbohydrate fractions of grazed Brachiaria decumbens and Brachiaria brizantha cv. Marandu grasses and Pueraria phaseoloides (tropical kudzu) legume were measured monthly during a 9-mo period from the end of one dry season to the end of the subsequent rainy season. Measurements of milk and growth responses to grazing these forages were used to predict animal productivity responses to dietary nu- trient availability throughout an annual cycle. The ME available for gain in our simulations was always more limiting than metabolizable protein. The predicted ME available for gain was 0.50 kg/d for steers grazing B.
Soil Biology and Biochemistry, 2006
Soil and Tillage Research, 2007
Nutrient Cycling in Agroecosystems, 2006
Global Change Biology, 2007
ABSTRACT
Geoderma, 1997
... 79 (1997) 49-67 GEODE~ Management control of soil organic matter dynamics in tropical land-us... more ... 79 (1997) 49-67 GEODE~ Management control of soil organic matter dynamics in tropical land-use systems Erick CM Fernandes a,*, Peter P. Motavalli ... transfer of C via the rhizosphere is just as important in the formation of SOM (Ladd and Martin, 1983; Martin and Merckx, 1993 ...
Biodiversity and Conservation, 2013
Applied Soil Ecology, 2007
Agroforestry Systems, 2005
Page 1. -1 Carbon and nutrient stocks in the litter layer of agroforestry systems in central Amaz... more Page 1. -1 Carbon and nutrient stocks in the litter layer of agroforestry systems in central Amazonia, Brazil Sandra C. Tapia-Coral1, Fla´vio J. Luizao1,*, Elisa Wandelli2 and Erick CM Fernandes3 1National Institute of Amazonian ...
Biodiversity and Conservation, 2013
Cattle production on Brachiaria pastures is a primary use of cleared forestland in the western Br... more Cattle production on Brachiaria pastures is a primary use of cleared forestland in the western Brazilian Amazon. About 6.8 million hectares in the States of Acre and Rondônia have been deforested, where 75% of land is now grazed (IBGE, 1998). The principal pasture species are B. brizantha and B. decumbens with the latter in decline from spittlebug susceptibility (Deois incompleta; Gonçalves et al., 1996). The general pattern of pasture establishment in the Amazon basin includes felling and burning forest biomass, planting annual crops for one to three years (especially on small farms), and then seeding to grasses. The conversion of tropical forest to pasture, the effects of that process on soil properties, and pasture degradation outcomes have been studied in the eastern Amazon region ( Serrao et al., 1978; Reiners et al., 1994; Sanchez and Salinas, 1981; Buschbacher et al., 1987; Moraes et al., 1996) but not in the remote western region. Most findings showed an initial increase in ...
The impacts of climate change on agriculture are projected to be significant in coming decades, s... more The impacts of climate change on agriculture are projected to be significant in coming decades, so response strategies and their likely costs should be evaluated now. Robust crop models are needed to estimate those impacts on agricultural productivity regionally, nationally, and even sub- nationally. But existing crop–climate change modeling platforms are not easily accessible to most stakeholders in developing countries. So there is less testing of those models than there might be, and there are fewer opportunities for further improvements based on local tests and emerging data. That is why this study produced an open-access crop-climate-economic impact modeling platform for Latin America and the Caribbean that can be extended to other regions—and modified and improved by users as new crop, climate, and economic datasets become available. The new platform projects the likely impacts of agroclimatic factors on crop productivity on the basis of climate projections from two general ci...
The Agro-ecological Zones Simulator (AZS) is a platform for data and models sharing for scientist... more The Agro-ecological Zones Simulator (AZS) is a platform for data and models sharing for scientists and policy makers, facilitating the analysis of climate change impacts and the identification of possible response strategies through a comprehensive regional-level analysis comprised of: (i) Geo-referenced climate, soil and terrain data, combined into a land resources database;(ii) Crop suitability assessment and land productivity of cropping systems; (iii) Procedures for calculating the potential agronomically attainable yield; (iv) Procedures for computing actual yields as limited by water availability and management, biotic and abiotic factors; and (v) Selected agricultural production systems with defined input and management relationships, crop-specific environmental requirements and adaptability characteristics. The software core of the platform is given by an instance of the BioMA platform. The platform facilitates the evaluation of the impacts of projected changes in temperatur...
Competition for limited water resources and low rice yields in developing countries has renewed t... more Competition for limited water resources and low rice yields in developing countries has renewed the interest in finding better ways to grow more rice with less water. In recent years alternate wet-dry (AWDI) and non-flooded (NF) irrigation have shown promise for reducing water consumption without significant effect on rice grain yield. In 2001, a survey of 109 farmers was conducted
Our objectives were to evaluate strate- gies to improve productivity and economic returns from be... more Our objectives were to evaluate strate- gies to improve productivity and economic returns from beef and dual-purpose cattle systems based on data collected on one dual-purpose (Bostaurus ×Bosindicus) and two beef (Nellore) cattle farms in the western Ama- zon region of Brazil. Forage chemical composition and digestion rates of carbohydrate fractions of grazed Brachiaria decumbens and Brachiaria brizantha cv. Marandu grasses and Pueraria phaseoloides (tropical kudzu) legume were measured monthly during a 9-mo period from the end of one dry season to the end of the subsequent rainy season. Measurements of milk and growth responses to grazing these forages were used to predict animal productivity responses to dietary nu- trient availability throughout an annual cycle. The ME available for gain in our simulations was always more limiting than metabolizable protein. The predicted ME available for gain was 0.50 kg/d for steers grazing B.
Soil Biology and Biochemistry, 2006
Soil and Tillage Research, 2007
Nutrient Cycling in Agroecosystems, 2006
Global Change Biology, 2007
ABSTRACT
Geoderma, 1997
... 79 (1997) 49-67 GEODE~ Management control of soil organic matter dynamics in tropical land-us... more ... 79 (1997) 49-67 GEODE~ Management control of soil organic matter dynamics in tropical land-use systems Erick CM Fernandes a,*, Peter P. Motavalli ... transfer of C via the rhizosphere is just as important in the formation of SOM (Ladd and Martin, 1983; Martin and Merckx, 1993 ...
Biodiversity and Conservation, 2013
Applied Soil Ecology, 2007
Agroforestry Systems, 2005
Page 1. -1 Carbon and nutrient stocks in the litter layer of agroforestry systems in central Amaz... more Page 1. -1 Carbon and nutrient stocks in the litter layer of agroforestry systems in central Amazonia, Brazil Sandra C. Tapia-Coral1, Fla´vio J. Luizao1,*, Elisa Wandelli2 and Erick CM Fernandes3 1National Institute of Amazonian ...