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| Registros recuperados: 202 | |
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| Rico, M.R.; Hernández, D.R.; Carozza, C.R.. |
| Assessment of abundance indexes for whitemouth croaker (Micropogonias furnieri) and brazilian flathead (Percophis brasiliensis) obtained with general linear models: Monte Carlo simulation and analysis of the interactions with the “year” factor. The effect of interactions with the year factor on the annual index of relative abundance obtained with general linear models applied to the cath per unit of effort data of whitemouth croaker and brazilian flathead commercial fleet was evaluated applying the Monte Carlo simulation. Levels on the relative percentage of variance explained by the interactions with the year factor (%RVEAÑO) were determined, above which loss of proportionality between the relative abundance series given by the index and the real series... |
| Tipo: Journal Contribution |
Palavras-chave: Stock assessment; Abundance; Catch/effort; Simulation; Commercial species; Coastal fisheries. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5503 |
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| Martini,Luiz Carlos Pittol. |
| Abstract: The objective of this work was to perform a sensitivity analysis of the main input parameters required for the AquaCrop water balance model, using biomass and grain yield data of a rainfed-simulated corn crop, obtained along the climate data series of 1987-2016 in the South of Brazil. The levels of soil-water stress and the depths of maximum effective rooting were the input parameters that most affected the biomass and grain yields simulated by the model, followed by the crop coefficient, water-use efficiency, soil water storage capacity, and contribution of groundwater to water availability in the root zone. The parameters crop cycle duration, plant density, pattern of soil-water extraction, and field surface practices showed little or no impact... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calibration; Crop model; Drought; Simulation; Soil-water balance; Soil-water stress. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000800934 |
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| Lago,Isabel; Streck,Nereu Augusto; Alberto,Cleber Maus; Oliveira,Felipe Brendler; Paula,Gizelli Moiano de. |
| The objective of this study was to assess the development response of cultivated rice and red rice to different increases in minimum and maximum daily air temperatures, in Santa Maria, Rio Grande do Sul State, Brazil. One hundred years climate scenarios of temperatures 0, +1, +2, +3, +4, and +5ºC, with symmetric and asymmetric increases in minimum and maximum daily air temperatures were created, using the LARS-WG Weather Generator, and a 1969-2003 database. Nine cultivated rice genotypes (IRGA 421, IRGA 416, IRGA 417, IRGA 420, BRS 7 TAIM, BR-IRGA 409, EPAGRI 109, EEA 406 and a hybrid), and two red rice biotypes (awned black hull-ABHRR, and awned yellow hull-AYHRR) were used. The dates of panicle differentiation (R1), anthesis (R4), and all grains with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Global warming; Phenology; Simulation; Weeds. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008001100001 |
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| Gustafson, Cole R.. |
| As farms increase in size, operators face the decision of remaining loyal to local merchants or obtaining volume discounts from distant input suppliers. When farmers bypass local merchants and buy inputs in volume, they often realize price discounts but forego many services including credit forebearance. When farmers buy locally, they pay higher prices, which decreases profits and increases financial risk, but generates social capital which can be drawn upon during periods of economic adversity. A theoretical model of farm financial risk evaluates borrower behavior in light of cash flow constraints, volume discounts, and social capital. Results delineate financial risks involved and value of social capital. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Capital; Financial risk; Simulation; Social; Stochastic; Agricultural Finance. |
| Ano: 2005 |
URL: http://purl.umn.edu/19169 |
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| Stoecker, Arthur L.; Sanders, Dee Ann; Whitacre, Brian E.. |
| This paper seeks to develop a methodology that will be useful for rural water districts in assessing the future of their water systems infrastructure. In particular, the use of free water simulation software and publicly available data on population, roads, and terrain present rural water systems with the opportunity to analyze their existing distribution system and forecast where problems are likely to occur. This methodology will allow various alternatives (such as consolidation with a neighboring system, or pipe upgrades) to be evaluated and the costs of implementing these alternatives to be explored. Finally, different avenues for funding the associated costs can be summarized and presented to the community, including the steps needed to apply for... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Rural Water; Infrastructure; Simulation; EPANET; Community/Rural/Urban Development; R53; R58. |
| Ano: 2009 |
URL: http://purl.umn.edu/56526 |
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| Koontz, Stephen R.; Hoag, Dana L.; Brethour, John R.; Walker, Jodine L.. |
| The cattle industry batch markets animals in pens. Because of this, animals within any one pen can be both underfed and overfed. Thus, there is a production inefficiency associated with batch marketing. We simulate the value of sorting animals through weight and ultrasound measurements from original pens into smaller alternative marketing groups. Sorting exploits the production inefficiency and enables cattle feeding enterprises to avoid meat quality discounts, capture premiums, more efficiently use feed resources, and increase returns. The value of sorting is between $15 and $25 per head, with declining marginal returns as the number of sort groups increases. |
| Tipo: Journal Article |
Palavras-chave: Cattle feeding; Production efficiency; Simulation; Sorting; Value-based marketing; Ultrasound; Agribusiness; Livestock Production/Industries; Marketing; Research and Development/Tech Change/Emerging Technologies; C15; D21; D23; Q12. |
| Ano: 2008 |
URL: http://purl.umn.edu/47266 |
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| Happe, Kathrin; Balmann, Alfons; Kellermann, Konrad. |
| A central criticism common to agricultural economic modelling approaches for policy analy-sis is that they do not adequately take account of a number of characteristic factors of the agri-cultural sector. This concerns aspects like the immobility of land, heterogeneity of farms, in-teractions between farms, space, dynamic adjustment processes as well as dynamics of struc-tural change. In brief, modelling the complexity of the system has not been at the centre of interest. In terms of modelling complex economic systems, an agent-based modelling ap-proach is a suitable approach to quantitatively model and understand such systems in a more natural way. In the same way, this applies to the modelling of agricultural structures. In par-ticular, agent-based... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agent-based systems; Multi-agent systems; Policy analysis; Structural change; Simulation; Agentenbasierte Systeme; Politikanalyse; Dynamische An-passungsprozesse und Strukturwandel. Kurz; Multi-Agentensysteme; Struktur-wandel; Agricultural and Food Policy; Q12; Q15. |
| Ano: 2004 |
URL: http://purl.umn.edu/14886 |
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| Schumann, Keith D.; Conner, J. Richard; Richardson, James W.; Stuth, Jerry W.; Hamilton, Wayne T.; Drawe, D. Lynn. |
| Woody plant encroachment restricts forage production and capacity to produce grazing livestock. Biophysical plant growth simulation and economic simulation were used to evaluate a prescribed burning range management technique. Modeling systems incorporated management practices and costs, historical climate data, vegetation and soil inventories, livestock production data, and historical regional livestock prices. The process compared baseline non-treatment return estimates to expected change in livestock returns resulting from prescribed burning. Stochastic analyses of production and price variability produced estimates of greater net returns resulting from use of prescribed burning relative to the baseline. |
| Tipo: Journal Article |
Palavras-chave: Biophysical simulation; Prescribed burning; Range management; Simulation; Land Economics/Use. |
| Ano: 2001 |
URL: http://purl.umn.edu/15452 |
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| Hudson, Darren; Ethridge, Don E.. |
| The impacts of using export taxes as a price control in a multi-market framework are explored using the cotton and yarn sectors in Pakistan as examples. Results show that the export tax on cotton increased domestic consumption and decreased exports of cotton in Pakistan, transferring income from cotton producers to yarn spinners and the government. There was a social loss to Pakistan in the cotton sector. The export tax on cotton increased domestic yarn production, consumption, exports, and incomes of yarn spinners, but resulted in a large transfer (social loss) out of the yarn sector. |
| Tipo: Journal Article |
Palavras-chave: Cotton; Export tax; Simultaneous equations; Simulation; Policy; International Relations/Trade. |
| Ano: 2000 |
URL: http://purl.umn.edu/15398 |
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| Berruto, Remigio; Busato, Patrizia. |
| The potential advantages of locally grown produce are mainly related to the coexistence of production and consumption in the same area. These advantages are: reduced transportation, freshness, better taste, easy traceability, transparency, food safety, environmental sustainability and community development. Despite these positive aspects, the money spent for locally grown produce represents only a small percentage of the total money spent for fresh produce purchases. On the other hand, interest is growing for furnishing produce to local produce schools, hospitals and public institutions. The supply chains of locally grown produce are classified into direct marketing distributions (farmers’ markets, CSAs, roadside stands, on-farm stores) and indirect... |
| Tipo: Book |
Palavras-chave: System approach; Locally grown; Supply–chain; Fruits and vegetables; Logistics; Simulation; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety. |
| Ano: 2009 |
URL: http://purl.umn.edu/58713 |
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| Registros recuperados: 202 | |
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