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A Partial Equilibrium Model of the Beef and Dairy Sector in Italy Under Imperfect Competition AgEcon
Moro, Daniele; Sckokai, Paolo; Soregaroli, Claudio.
In this paper we present a partial equilibrium model for the bovine sector (beef and dairy) in Italy, which can be used for simulation and forecasting. The structure of the model follows the vertical chain of the beef and dairy sector, allowing trade of both agricultural raw materials and final products. Since the processing and retailing stage is characterised by an imperfectly competitive structure, the model accounts for market power in modelling the price transmission mechanism. This provides further insights on the vertical transmission of shocks, both at the final level (i.e. the BSE crisis) and at the farm level (i.e. agricultural policy reform).
Tipo: Conference Paper or Presentation Palavras-chave: Simulation models; Policy analysis; Imperfect competition; Beef; Dairy; Livestock Production/Industries.
Ano: 2002 URL: http://purl.umn.edu/24787
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Agricultural water productivity: estimation at plot, farm and basin scale AgEcon
Cook, Simon; Gichuki, Francis; Turral, Hugh.
Tipo: Working or Discussion Paper Palavras-chave: Irrigated farming; Productivity; Estimation; Water balance; Water use; Simulation models; Water use efficiency; Livestock; Fisheries; Production Economics; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/91959
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Agro-climatic suitability and water requirement for Tanzania guineagrass cultivation in the State of Ceará. Repositório Alice
LEMOS, N. L. S.; CAVALCANTE, A. C. R.; SILVA, T. G. F. da; PEZZOPANE, J. R. M.; SANTOS, P. M.; CÂNDIDO, M. J. D..
Abstracts: This study aimed to define areas suitable, and the irrigation water requirement for, cultivation of Tanzania guineagrass in the state of Ceará, Brazil. Tanzania guineagrass yield was estimated by a mathematical model, which considers the crop actual evapotranspiration, resulting from the crop climatological water balance. The water requirement throughout the year was estimated for soils with a water holding capacity of 20 (shallow soils), 40 (sandy soils), 60 (soils with medium texture) and 100 mm (clay soils). The relative frequency of occurrence of monthly productions greater than 2,750 kg DM ha-1 month-1 was obtained for different areas in Ceará, representative of most of the state's economic mesoregions. Tanzania guineagrass annual yields in...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Capacidade de armazenamento de água; Taxa de acúmulo; Capim Tanzânia; Brasil; Ceará; Panicum maximum; Modelo matemático; Gramínea forrageira; Matéria seca; Mathematical models; Simulation models; Water requirements; Water storage; Pastures; Brazil.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1070933
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An Ag-dependent approach based on adaptive mechanisms for investigating the regulation of the memory B cell reservoir. Repositório Alice
CASTRO, A. de..
In fact, it is well-known that the soluble antibody population is one of the essential mechanisms of immunological response regulation [23-25]. However, despite the pioneering work of Lagreca et al. (2001) in developing a coupled map for studying the behavior of the mammalian immune system, their model did not consider these populations [1-6], which makes the model incomplete with respect to the regulation of the immune response by adaptive mechanisms. This omission opens up the possibility of extending their work by taking the soluble antibody populations into account. We have performed that work and present our immunological modeling and simulation findings in this paper.
Tipo: Capítulo em livro científico (ALICE) Palavras-chave: Modelo dinâmico; Modelo de simulação; Modelo matemático; Simulação dinâmica; Células B; Dynamic models; Simulation models; Mathematical models.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/924382
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An expert system for planning and designing dairy farms in hot climates CIGR Journal
Mohamed Samer; Cairo University, Faculty of Agriculture, Department of Agricultural Engineering; Mohamed Hatem; Hartmut Grimm; Reiner Doluschitz; Thomas Jungbluth.
Eleven simulation models were developed to plan and design several dairy farm facilities.  Subsequently, an electronic spark map (decision tree) was developed for each simulation model, and then the simulation models were integrated into the relevant spark maps.  Afterwards, C# language (C Sharp), which is an object-oriented programming language, was used to develop an expert system via the simulation models and the electronic spark maps.  The developed expert system is able to plan and design several dairy farm facilities, e.g. housing system (corrals system), shade structure and roof material, concrete base, cooling system, milking parlour, forage storage, and manure handling system.  Subsequently, it plans the farmstead layout, and it leads to implement...
Palavras-chave: Expert systems; Simulation models; Spark maps; Precision livestock farming; Dairy cows.
Ano: 2012 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2088
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Análise de sensibilidade do modelo de Caprio para simulação de evolução de resistência de pragas a toxinas BT. Infoteca-e
MAIA, A. de H. N.; DOURADO NETO, D..
2009
Tipo: Documentos (INFOTECA-E) Palavras-chave: Modelo de Caprio; Praga de planta; Resistência a pesticida; Modelo de simulação; Planta transgênica; Plant pests; Pesticide resistance; Simulation models; Transgenic plants.
Ano: 2009 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/83084
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Analysis of yield gaps in farmer's fields in an intensive irrigated rice system International Rice Research Institute
Simbahan, Gregorio C..
xvi, 146 leaves : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Yields; Irrigation; Simulation models.
Ano: 2000 URL: http://hdl.handle.net/123456789/495
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Applying CSM-CERES-Maize to define a sowing window for irrigated maize crop: The Riacho´s Farm case study. Repositório Alice
AMARAL, T. A.; ANDRADE, C. de L. T. de; ALVES, M. E. B.; SILVA, D. F..
Irrigation use constitutes an alternative to improve maize production in Central Minas Gerais State, Brazil. However, even under adequate water supply conditions, other environmental factors may influence maize crop growth and development and may, ultimately, affect grain yield. This study aimed to establish a sowing window for irrigated maize crop, based on simulation results obtained with the decision support model CSM-CERES-Maize. Simulations were made for crop management conditions of Riacho ?s Farm, located in Matozinhos, Minas Gerais State, Brazil. It was employed the model ?s seasonal tool, along with a data set containing 46 years of weather data records, to simulate maize yield for weekly sowing scenarios, starting on August 1 stand ending on July...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Manejo de cultura; DSSAT; Simulação; Milho; Zea mays; Simulation models.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/899351
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Aptidão e potencial de produção de milho em municípios de Minas Gerais. Infoteca-e
PAIXÃO, J. de S.; ANDRADE, C. de L. T. de; SILVA, P. P. G. da; MAGALHÃES, B. G.; MELO, B. F..
A maior parte da produção de milho no Brasil ocorre em regime de sequeiro, tanto na primeira quanto na segunda safra, estando, portanto, sujeita a instabilidades climáticas que podem afetar o rendimento de grãos. Irregularidade no regime de chuvas, que induz estresse hídrico na cultura, é o principal fator responsável pela quebra da produtividade do milho no país. Algumas estratégias de manejo da cultura podem ser empregadas para atenuar este problema, entre as quais a escolha do período de semeadura adequado, preconizado no zoneamento de risco climático do Ministério da Agricultura, Pecuária e Abastecimento (Mapa). As ferramentas computacionais utilizadas no zoneamento necessitam, todavia, serem aprimoradas, principalmente em razão da nova era chamada...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Zea mays; Semeadura; Modelo de simulação; Sowing; Simulation models.
Ano: 2016 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/1056084
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Avaliações preliminares da dinâmica populacional do percevejo bronzeado em Eucalyptus camaldulensis em condições de criação laboratorial: estudo por simulação numérica. Repositório Alice
LAZARIN, D. F.; PESSOA, M. C. P. Y.; SA, L. A. N. de; MARINHO-PRADO, J. S..
Resumo: A importância mundial ao segmento florestal foi reforçada em 2011 pela Organização das Nações Unidas ao elegê-lo como Ano Internacional das Florestas. O Brasil registrou nos últimos dez anos significativo aumento na área de florestas plantadas, sendo 95% de eucalipto e pinus no ano de 2009. Nesse ano, os estados de Minas Gerais, São Paulo, Bahia, Mato Grosso do Sul e Rio Grande do Sul responderam por pouco mais de 78% da área plantada de eucalipto. Todavia, esse potencial produtivo vem sendo afetado por novas pragas exóticas. O percevejo bronzeado Thaumastocoris peregrinus (Hemiptera: Thaumastocoridae), de origem australiana e no país desde 2008, vem exigindo pesquisas sobre seu comportamento em ambiente brasileiro para fundamentar propostas de...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Percevejo bronzeado; Praga de planta; Dinâmica populacional; Eucalyptus camaldulensis; Modelo de simulação; Simulation models.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/915755
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Can timber provision from Amazonian production forests be sustainable? Repositório Alice
PIPONIOT, C.; RÖDIG, E.; PUTZ, F. E.; BLANC, L.; DERROIRE, G.; DESCROIX, L.; GUEDES, M. C.; CORONADO, E. H.; HUTH, A.; KANASHIRO, M.; LICONA, J. C.; FREITAS, L. J. M. de; OLIVEIRA, M. V. N. d'; PEÑA-CLAROS, M.; RODNEY, K.; SHENKIN, A.; SOUZA, C. R. de; VIDAL, E.; WEST, T. A. P.; WORTEL, V.; HÉRAULT, B..
Around 30Mm3 of sawlogs are extracted annually by selective logging of natural production forests in Amazonia, Earth?s most extensive tropical forest. Decisions concerning the management of these production forests will be of major importance for Amazonian forests? fate. To date, no regional assessment of selective logging sustainability supports decision-making. Based on data from 3500 ha of forest inventory plots, our modelling results show that the average periodic harvests of 20m3 ha?1 will not recover by the end of a standard 30 year cutting cycle. Timber recovery within a cutting cycle is enhanced by commercial acceptance of more species and with the adoption of longer cutting cycles and lower logging intensities. Recovery rates are faster in Western...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Manejo florestal; Explotación forestal; Extração seletiva; Selective logging; Exploración selectiva; Regeneración natural; Modelos de simulación; Administração Florestal; Exploração Florestal; Extração da Madeira; Madeira Serrada; Impacto Ambiental; Regeneração Natural; Modelo de Simulação; Forest management; Logging; Lumber; Environmental impact; Natural regeneration; Simulation models.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1113285
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Can timber provision from Amazonian production forests be sustainable? Repositório Alice
PIPONIOT, C.; RÖDIG, E.; PUTZ, F. E.; RUTISHAUSER, E.; SIST, P.; ASCARRUNZ, N.; BLANC, L.; DERROIRE, G.; DESCROIX, L.; GUEDES, M. C.; CORONADO, E. H.; HUTH, A.; KANASHIRO, M.; LICONA, J. C.; FREITAS, L. J. M. de; OLIVEIRA, M. V. N. d'; PEÑA-CLAROS, M.; RODNEY, K.; SHENKIN, A.; SOUZA, C. R. de; VIDAL, E.; WEST, T. A. P.; WORTEL, V.; HÉRAULT, B..
Around 30Mm3 of sawlogs are extracted annually by selective logging of natural production forests in Amazonia, Earth?s most extensive tropical forest. Decisions concerning the management of these production forests will be of major importance for Amazonian forests? fate. To date, no regional assessment of selective logging sustainability supports decision-making. Based on data from 3500 ha of forest inventory plots, our modelling results show that the average periodic harvests of 20m3 ha?1 will not recover by the end of a standard 30 year cutting cycle. Timber recovery within a cutting cycle is enhanced by commercial acceptance of more species and with the adoption of longer cutting cycles and lower logging intensities. Recovery rates are faster in Western...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Manejo florestal; Explotación forestal; Extração seletiva; Selective logging; Exploración selectiva; Regeneración natural; Modelos de simulación; Administração Florestal; Exploração Florestal; Extração da Madeira; Madeira Serrada; Impacto Ambiental; Regeneração Natural; Modelo de Simulação; Forest management; Logging; Lumber; Environmental impact; Natural regeneration; Simulation models.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114232
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China's Accession to the WTO: What Is at Stake for Agricultural Markets? AgEcon
Fuller, Frank H.; Beghin, John C.; de Cara, Stephane; Fabiosa, Jacinto F.; Fang, Cheng; Matthey, Holger.
We analyze the impact of China's accession to the World Trade Organization on major crop and livestock markets using the FAPRI modeling framework. We incorporate expected changes in consumer income, textile production, and trade policies as exogenous shocks to the baseline model. Following accession, revenues decline in China's livestock, grain, and oilseed industries, while cotton production prospers despite increased cotton imports. Chinese consumers benefit from lower food prices, with vegetable oil, dairy, and meat consumption increasing significantly. Argentina, Brazil, Canada, the European Union, and the United States are the greatest beneficiaries from expanded agricultural trade with China.
Tipo: Working or Discussion Paper Palavras-chave: Accession; Agricultural trade; China; Policy analysis; Simulation models; Trade liberalization; World Trade Organization; International Relations/Trade.
Ano: 2001 URL: http://purl.umn.edu/18522
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Computer simulation of the population dynamics of the yellow stem borer, Scirpophaga incertulas (Walker) International Rice Research Institute
Xia, Jingyuan.
132 l. : ill. Thesis (M.S.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Insect pests; Scirpophaga incertulas; Population dynamics; Simulation models; Mathematical models; Computers.
Ano: 1988 URL: http://hdl.handle.net/123456789/1184
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Curvas de calibração para biomassa e Índice de Área Foliar (IAF) para a cultura da cana-de-açúcar. Repositório Alice
ROSA, R. Z.; CASTRO, A. de..
A utilização de modelos fundamentados em dados estatísticos para simulação de safras se mostra uma opção de grande interesse, no entanto, a dificuldade de obter uma boa representatividade do comportamento real da cultura durante todo seu ciclo de desenvolvimento, faz com que estudos para o aperfeiçoamento dos modelos de simulação sejam necessários. Dessa forma, tomando por base a necessidade de se obter modelos mais representativos para as curvas de crescimento de variedades de cana-de-açúcar brasileiras, é que se buscou, por meio da utilização do software CropSyst, a construção de curvas de calibração que permitam estabelecer parâmetros ligados ao acúmulo de tempo, utilização da água e radiação para analisar de forma particionada a evolução de sua biomassa.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Biomassa; Índice de área foliar; Modelos de simulação; Biomass; Leaf area index; Simulation models.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/954490
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Delivering the Goods: Scaling out Results of Natural Resource Management Research Ecology and Society
Harrington, Larry; International Maize and Wheat Improvement Center (CIMMYT); l.harrington@cgiar.org; White, Jeffrey; ; j.white@cgiar.org; Grace, Peter; Sinclair Knight Merz, Brisbane, Australia; pgrace@skm.com.au; Hodson, David; ; d.hodson@cgiar.org; Hartkamp, Agnes Dewi; Product Organisation Grains, Seeds and Pulses, The Hague, Netherlands; d.hartkamp@wisint.org; Vaughan, Christopher; CO MET Directorate of Environmental Affairs, Namibia; kit@africaonline.com.na; Meisner, Craig; ; cmeisner@bttb.net.bd.
To help integrated natural resource management (INRM) research "deliver the goods" for many of the world's poor over a large area and in a timely manner, the authors suggest a problem-solving approach that facilitates the scaling out of relevant agricultural practices. They propose seven ways to foster scaling out: (1) develop more attractive practices and technologies through participatory research (2) balance supply-driven approaches with resource user demands, (3) use feedback to redefine the research agenda, (4) encourage support groups and networks for information sharing, (5) facilitate negotiation among stakeholders, (6) inform policy change and institutional development, and (7) make sensible use of information management tools, including models...
Tipo: Peer-Reviewed Reports Palavras-chave: Mexico; South Asia; Southern Africa; Conservation tillage; Diffusion of research; Environments; Geographic information systems; Natural resource management; Participatory research; Scaling out; Simulation models; Technology transfer.
Ano: 2001
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Determining the deficit coefficient as a function of irrigation depth and distribution uniformity AGRIAMBI
Mantovani,Everardo C.; Faccioli,Gregório G.; Leal,Brauliro G.; Costa,Luis C.; Soares,Antônio A.; Freitas,Paulo S. L..
The present study aimed at the development of the water deficit coefficient as a function of the Christiansen uniformity coefficient and relationship between the applied water depth and that required by a given crop, taking into account that the water distribution by the sprinkler follows a normal distribution. Another objective was to compare the experimental results to those obtained through simulation with the Mantovani model. For this, the water deficit coefficients developed in this work were used, as well as the simplified coefficient that takes into account the water distribution by the sprinkler following a uniform distribution, and finally the development of the production functions for the bean crop by using the Mantovani model. The production...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sprinkle; Simulation models; Bean crop.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000300003
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Developing a hydrological model for the Mekong Basin: impacts of basin development on fisheries productivity. AgEcon
Kite, Geoff.
Tipo: Working or Discussion Paper Palavras-chave: Simulation models; Hydrology; River basins; Water resource management; Productivity; Flow; Fisheries; Mapping; Data collection; Computer techniques; Climate; Soil properties; Stream flow; Dams; Productivity Analysis; Resource /Energy Economics and Policy.
Ano: 2000 URL: http://purl.umn.edu/92781
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Ecological and Social Dynamics in Simple Models of Ecosystem Management Ecology and Society
Carpenter, Stephen R; University of Wisconsin-Madison; srcarpen@wisc.edu; Brock, William; University of Wisconsin; brock@macc.wisc.edu; Hanson, Paul; University of Wisconsin; pchanson@facstaff.wisc.edu.
Simulation models were developed to explore and illustrate dynamics of socioecological systems. The ecosystem is a lake subject to phosphorus pollution. Phosphorus flows from agriculture to upland soils, to surface waters, where it cycles between water and sediments. The ecosystem is multistable, and moves among domains of attraction depending on the history of pollutant inputs. The alternative states yield different economic benefits. Agents form expectations about ecosystem dynamics, markets, and/or the actions of managers, and choose levels of pollutant inputs accordingly. Agents have heterogeneous beliefs and/or access to information. Their aggregate behavior determines the total rate of pollutant input. As the ecosystem changes, agents update their...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive agent models; Adaptive management; Bounded rationality; Ecological economics; Ecosystem oscillations; Integrated models; Lake eutrophication; Nonpoint pollution; Phosphorus cycles; Simulation models; Social-natural systems..
Ano: 1999
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Economic-financial feasibility of pantaneiro lamb finishing systems. Repositório Alice
SILVA, L. T. da; REIS NETO, J. F. fos; MALAFAIA, G. C.; COSTA, J. A. A. da.
Abstract: Technical and economic-financial performance of pantaneiro lamb finishing in feedlot (F) and semi-feedlot (SF) was evaluated. When analyzing the profitability, economic efficiency and the price sensitivity, was profit in all the scenarios evaluated. The gross margin (GM) was 69% and 52%, net margin (NM) was 65% and 48% and profitability index (PI) was 39% and 29%, as well as total productivity of factors (TPF) was R$1.53 and R$1.36, respectively, in the systems F and SF. Investment analysis showed that the activity is economically viable, remunerating all production factors and capital invested. Internal return tax was, respectively, 27% and 16% for the in feedlot and semi-feedlot systems. [Viabilidade econômico-financeira de sistemas de...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Production systems; Production simulation; Pantaneiro lamb; Fattening; Brasil; Ovino; Performance; Sistema de Produção; Custo de Produção; Terminação; Confinamento; Sheep; Simulation models; Animal performance; Feedlots; Economic analysis; Cost analysis; Viability; Brazil.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1099153
Registros recuperados: 83
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