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Registros recuperados: 8
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Climatic risk of grape downy mildew (Plasmopara viticola) for the State of São Paulo, Brazil Scientia Agricola
Hamada,Emília; Ghini,Raquel; Rossi,Paulo; Pedro Júnior,Mário José; Fernandes,Jeferson Lobato.
Viticulture in Brazil has been growing in importance in recent years. In the State of São Paulo, a significant percentage of the production is basically destined to in natura consumption and, more recently, much effort has been made by institutions to revitalize the viticulture in the State. Among fungal diseases, the downy mildew (Plasmopara viticola) is one of the main diseases affecting this crop in Brazil, with extreme damage effects on its production. The objective of this study was to estimate the incidence of the downy mildew on grape under the climatic conditions of the State of São Paulo, based on a mathematical model and using Geographical Information System - GIS tools. The study considered the months from September to April, a period in which...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis spp.; Geographical Information System; Temperature; Relative humidity; Leaf wetness duration.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700010
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EXPERT OPINION VERSUS TRANSACTION EVIDENCE: USING THE REILLY INDEX TO MEASURE OPEN SPACE PREMIUMS IN THE URBAN-RURAL FRINGE AgEcon
Cotteleer, Geerte; Stobbe, Tracy; van Kooten, G. Cornelis.
Due to economic and population growth farmland and to a lesser extend other undeveloped areas are under pressure in the urban-rural fringe in British Columbia, Canada. The objectives of this paper are to determine if residential property values near Victoria, BC include open-space premiums for farmland or parks or both, and to determine if using assessed values instead of market prices of the property result in the same findings. We estimate a SUR (Seemingly Unrelated Regression) model with two hedonic pricing equations, one with actual market values as the dependent variable and one with assessed property values, and compare the resulting estimates of shadow prices for open space amenities. Furthermore, we take account of spatial autocorrelation and...
Tipo: Conference Paper or Presentation Palavras-chave: Hedonic pricing models; Assessed property values; Value of open space; Geographical Information System; Reilly; GMM; Spatial dependence; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/6705
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Farmland Conservation in the Netherlands and British Columbia, Canada: A Comparative Analysis Using GIS-Based Hedonic Pricing Models AgEcon
Cotteleer, Geerte; Stobbe, Tracy; van Kooten, G. Cornelis.
As a result of urban development farmland in many countries is under pressure. Reasons to preserve farmland are related to cultural heritage, food safety, open space, the environment, but also slowing and restricting development is a reason. To protect farmland countries use different land use policies. This paper will look specifically at two jurisdictions: The Netherlands and a particularly rich farming area in British Columbia, Canada. For these areas we will investigate how the institutions and laws present in these jurisdictions contribute to agricultural land preservation. We will analyse farmland values in a GIS-based hedonic pricing framework to answer this question. This combination enables us to analyse direct impacts of laws and regulations...
Tipo: Working or Discussion Paper Palavras-chave: Hedonic pricing models; Zoning policies; Geographical Information System; Agricultural land values at the urban fringe; Agricultural and Food Policy; Environmental Economics and Policy; Land Economics/Use; Q10; Q15; R52.
Ano: 2007 URL: http://purl.umn.edu/37045
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Hobby Farms and British Columbia'a Agricultural Land Reserve AgEcon
Stobbe, Tracy; Eagle, Alison J.; van Kooten, G. Cornelis.
Agricultural land protection near the urban-rural fringe is a goal of many jurisdictions, including British Columbia, Canada, which uses a provincial-wide zoning scheme to prevent subdivisions and non-agricultural uses of the land. Preferential taxes are also used to encourage agricultural use of the land. Small scale hobby farmers are present at the urban fringe near Victoria (the capital), both inside and outside of the Agricultural Land Reserve (ALR). The goal of this paper is to investigate whether hobby farms create problems for agricultural land preservation. We make use of a GIS (geographic information system) model to construct detailed spatial variables and analyse our parcel-level data set using an hedonic pricing model and a limited dependent...
Tipo: Working or Discussion Paper Palavras-chave: Hobby farmers; Agricultural Land Reserve; Geographical Information System; Urban-rural fringe; Zoning systems; Farmland fragmentation; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; R11; R15; C50; R14.
Ano: 2008 URL: http://purl.umn.edu/42244
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Hobby Farms and Protection of Farmland in British Columbia AgEcon
Stobbe, Tracy; Eagle, Alison J.; van Kooten, G. Cornelis.
Tipo: Working or Discussion Paper Palavras-chave: Hobby farmers; Agricultural Land Reserve; Geographical Information System; Urban-rural fringe; Zoning systems; Farmland fragmentation; Agricultural and Food Policy; Land Economics/Use; R11; R15; C50; R14.
Ano: 2008 URL: http://purl.umn.edu/37048
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Incorporating Local Water Quality in Welfare Measures of Agri-environmental Policy: A Choice Modelling Approach Employing GIS AgEcon
Tait, Peter R.; Baskaran, Ramesh.
The spatial distribution of agro-environmental policy benefits has important implications for the efficient allocation of management effort. The practical convenience of relying on sample mean values of individual benefits for aggregation can come at the cost of biased aggregate estimates. The main objective of this paper is to test spatial hypotheses regarding respondents’ local water quality and quantity, and their willingness-to-pay for improvements in water quality attributes. This paper combines choice experiment and spatially related water quality data via a Geographical Information System (GIS) to develop a method that evaluates the influence of respondents’ local water quality on willingness-to-pay for river and stream conservation programs in...
Tipo: Conference Paper or Presentation Palavras-chave: Water Quality; Choice Experiment; Geographical Information System; Environmental Economics and Policy; Resource /Energy Economics and Policy; Q51; Q25; Q58.
Ano: 2011 URL: http://purl.umn.edu/116074
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Intégration dans un SIG de données issues de capteurs satellites en comparaison de données in situ pour le suivi de la qualité des eaux côtières ArchiMer
Lozach, Loic; Gohin, Francis; Oger-jeanneret, Helene.
Tipo: Text Palavras-chave: Geographical Information System; Remote sensing; Satellite data; Sensor; Water quality monitoring; Sea surfacte temperature; Chlorphyll; Coastal water.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-2403.pdf
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Spatial and temporal variability of leaf wetness duration in the State of São Paulo, Brazil Scientia Agricola
Hamada,Emília; Ghini,Raquel; Fernandes,Jeferson Lobato; Pedro Júnior,Mário José; Rossi,Paulo.
One of the main factors influencing the occurrence of plant diseases is the leaf wetness duration (LWD). However, this climatic parameter is not generally and systematically recorded at meteorological stations, and the alternative to obtain an estimate for LWD is the use of mathematical models. The objective of this study was to estimate LWD for the State of São Paulo, on the basis of the number of hours with relative humidity equal to or higher than 90%, and also plot them on a map with help of the Geographical Information System (GIS) tool. Using daily relative humidity data from ten meteorological stations of the State, for six years, adjustment equations were obtained for different LWD periods (hours day-1) (R² from 0.58 to 0.81) and of number of days...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant diseases; Relative humidity; Geographical Information System; Regression equation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000700006
Registros recuperados: 8
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