Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 79
Primeira ... 1234 ... Última
Imagem não selecionada

Imprime registro no formato completo
A Binary Logit Estimation of Factors Affecting Adoption of GPS Guidance Systems by Cotton Producers AgEcon
Banerjee, Swagata (Ban); Martin, Steven W.; Roberts, Roland K.; Larkin, Sherry L.; Larson, James A.; Paxton, Kenneth W.; English, Burton C.; Marra, Michele C.; Reeves, Jeanne M..
Binary logit analysis was used to identify the factors influencing adoption of Global Positioning System (GPS) guidance systems by cotton farmers in 11 Mid-south and Southeastern states. Results indicate that adoption was more likely by those who had already adopted other precision-farming practices and had used computers for farm management. In addition, younger and more affluent farmers were more likely to adopt. Farmers with larger farms and with relatively high yields were also more likely to adopt. Education was not a significant factor in a farmer’s decision to adopt GPS guidance systems.
Tipo: Journal Article Palavras-chave: Binary logit; Cotton; GPS guidance system; Marginal effect; Precision farming; Technology adoption; Agribusiness; Crop Production/Industries; Q2; Q16; Q19; Q20; Q24.
Ano: 2008 URL: http://purl.umn.edu/45530
Imagem não selecionada

Imprime registro no formato completo
A LOGIT ANALYSIS OF PARTICIPATION IN TENNESSEE'S FOREST STEWARDSHIP PROGRAM AgEcon
Bell, Caroline D.; Roberts, Roland K.; English, Burton C.; Park, William M..
This study determines the likely effect of cost-share incentives on participation in the Tennessee Forest Stewardship Program and identifies other factors that may contribute to participation. A random utility model is used to determine the probability that a landowner will choose to participate in the program. A binary choice model is specified to represent the dichotomous decision and a logit procedure is used to fit the model. Data are obtained from mail surveys of 4,000 randomly selected landowners. Results indicate that attitudes and knowledge of forestry programs may be more influential in a landowner's decision to participate than monetary incentives.
Tipo: Journal Article Palavras-chave: Cost-share incentive; Stewardship Incentive Program; Logit; Nonindustrial private forest; NIPF; Participation; Forestry; Trees; Resource /Energy Economics and Policy.
Ano: 1994 URL: http://purl.umn.edu/15185
Imagem não selecionada

Imprime registro no formato completo
Adoption and Abandonment of Precision Soil Sampling in Cotton Production AgEcon
Walton, Jonathan C.; Roberts, Roland K.; Lambert, Dayton M.; Larson, James A.; English, Burton C.; Larkin, Sherry L.; Martin, Steven W.; Marra, Michele C.; Paxton, Kenneth W.; Reeves, Jeanne M..
Technology adoption in precision agriculture has received considerable attention, while abandonment has received little. Our objective was to identify factors motivating adoption and abandonment of precision soil sampling in cotton. Results indicate younger producers who farmed more cotton area, owned more of their cropland, planted more non-cotton area, used a computer, or used a Personal Digital Assistant (PDA) were more likely to adopt precision soil sampling. Those with more cotton area or who owned livestock were more likely to abandon, while those who used precision soil sampling longer, used a PDA, or used variable-rate fertilizer application were less likely to abandon.
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries.
Ano: 2008 URL: http://purl.umn.edu/6215
Imagem não selecionada

Imprime registro no formato completo
Adoption and Abandonment of Precision Soil Sampling in Cotton Production AgEcon
Walton, Jonathan C.; Lambert, Dayton M.; Roberts, Roland K.; Larson, James A.; English, Burton C.; Larkin, Sherry L.; Martin, Steven W.; Marra, Michele C.; Paxton, Kenneth W.; Reeves, Jeanne M..
Adoption of precision agriculture technology has arrived considerable attention, but abandonment has received little. This paper identified factors motivating adoption and abandonment of precision soils sampling in cotton. Younger producers who farmed more cotton area, owned more of their cropland, planted more non-cotton area, or used a computer were more likely to adopt precision soil sampling. Those with more cotton area or who owned livestock were more likely to abandon, while those who used precision soil sampling longer, or used variable-rate fertilizer application were less likely to abandon precision soil sampling.
Tipo: Journal Article Palavras-chave: Abandonment; Adoption; Cotton; Precision; Agriculture; Soil sampling; Southeastern United States; Crop Production/Industries.
Ano: 2008 URL: http://purl.umn.edu/46556
Imagem não selecionada

Imprime registro no formato completo
Adoption of Conservation-Tillage Methods and Genetically Modified Cotton AgEcon
Roberts, Roland K.; English, Burton C.; Gao, Qi; Larson, James A..
Adoption of herbicide-tolerant cotton and conservation tillage may be simultaneously related. Bayes' theorem and a two-equation logit model were used to test the simultaneity hypothesis. Evidence for Tennessee suggests that adoption of these technologies reduced residual herbicide use and soil erosion more than if adoption of these technologies were independent.
Tipo: Conference Paper or Presentation Palavras-chave: Bayes' theorem; Conservation tillage; Cotton; Genetically modified crops; Herbicide tolerant crops; Simultaneous logit model; Technology adoption; Crop Production/Industries; Q12; Q16; Q24; O33.
Ano: 2005 URL: http://purl.umn.edu/35293
Imagem não selecionada

Imprime registro no formato completo
Adoption of Conservation-Tillage Practices in Cotton Production AgEcon
Banerjee, Swagata (Ban); Martin, Steven W.; Roberts, Roland K.; Larson, James A.; Hogan, Robert J., Jr.; Johnson, Jason L.; Paxton, Kenneth W.; Reeves, Jeanne M..
Replaced with revised version of paper 10/23/07.
Tipo: Conference Paper or Presentation Palavras-chave: Conservation tillage; Cotton; Genetically modified seed; Herbicide-resistant cotton; Stacked-gene cotton; Simultaneous logit model; Single-equation logit model; Technology adoption; Crop Production/Industries.
Ano: 2007 URL: http://purl.umn.edu/34842
Imagem não selecionada

Imprime registro no formato completo
Adoption of No-Tillage Practices, Other Conservation-Tillage Practices and Herbicide-Resistant Cotton Seed, and Their Synergistic Environmental Impacts AgEcon
Roberts, Roland K.; English, Burton C.; Gao, Qi; Larson, James A..
If adoption of herbicide-resistant seed and adoption of conservation-tillage practices are determined simultaneously, adoption of herbicide-resistant seed could indirectly reduce soil erosion and adoption of conservation-tillage practices could indirectly reduce residual herbicide use and increase farm profits. Our objective was to evaluate the relationship between these technologies for Tennessee cotton production. Evidence from simultaneous estimation of a trinomial logit model for adoption of no-tillage, other conservation-tillage, and conventional-tillage practices and a binomial logit model for adoption of herbicide-resistant and conventional cotton seed suggests a simultaneous relationship. The elasticity for acreage in herbicide-resistant seed...
Tipo: Conference Paper or Presentation Palavras-chave: Environmental Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/21304
Imagem não selecionada

Imprime registro no formato completo
Adoption of Site-Specific Information and Variable-Rate Technologies in Cotton Precision Farming AgEcon
Roberts, Roland K.; English, Burton C.; Larson, James A.; Cochran, Rebecca L.; Goodman, W. Robert; Larkin, Sherry L.; Marra, Michele C.; Martin, Steven W.; Shurley, W. Donald; Reeves, Jeanne M..
Probit analysis identified factors that influence the adoption of precision farming technologies by Southeastern cotton farmers. Younger, more educated farmer who operated larger farms and were optimistic about the future of precision farming were most likely to adopt site-specific information technology. The probability of adopting variable-rate input application technology was higher for younger farmers who operated larger farms, owned more of the land they farmed, were more informed about the costs and benefits of precision farming, and were optimistic about the future of precision farming. Computer use was not important, possibly because custom hiring shifts the burden of computer use to agribusiness firms.
Tipo: Journal Article Palavras-chave: Cotton; Grid soil sampling; Precision farming; Probit; Sample selection; Site-specific information; Technology adoption; Variable-rate application; D21; Q12; Q16.
Ano: 2004 URL: http://purl.umn.edu/42943
Imagem não selecionada

Imprime registro no formato completo
ADOPTION OF SPATIAL INFORMATION GATHERING TECHNOLOGIES AND VARIABLE RATE INPUT APPLICATION TECHNOLOGIES BY COTTON FARMERS IN THE SOUTHEAST AgEcon
Martin, Steven W.; Roberts, Roland K.; English, Burton C.; Larson, James A.; Cochran, Rebecca L.; Goodman, W. Robert; Larkin, Sherry L.; Marra, Michele C.; Shurley, W. Donald; Reeves, Jeanne M..
Probit analysis identified factors influencing adoption of precision farming technologies by Southeastern cotton farmers. Younger, more educated farmers who operated larger farms and were optimistic about the future of precision farming were most likely to adopt site-specific information technology. The probability of adopting variable rate input application technology was higher for younger farmers who operated larger farms, owned more of the land they farmed, were more informed about the costs and benefits of precision farming, and were optimistic about the future of precision farming. Computer use was not important possibly because custom hiring shifts the burden of computer use to agribusiness firms.
Tipo: Conference Paper or Presentation Palavras-chave: Research and Development/Tech Change/Emerging Technologies.
Ano: 2004 URL: http://purl.umn.edu/34768
Imagem não selecionada

Imprime registro no formato completo
AJAE Appendix: Challenges to the Development of a Dedicated Energy Crop AgEcon
Epplin, Francis M.; Clark, Christopher D.; Roberts, Roland K.; Hwang, Seonghuyk.
The material contained herein is supplementary to the article named in the title and published in the American Journal of Agricultural Economics, Volume 89, Number 5, December 2007.
Tipo: Journal Article Palavras-chave: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies.
Ano: 2007 URL: http://purl.umn.edu/7072
Imagem não selecionada

Imprime registro no formato completo
Amenity Value of Urban Forest Landscapes Attributed to Houses within a 10-Minute Driving Distance AgEcon
Kim, Seung Gyu; Cho, Seong-Hoon; Roberts, Roland K.; Claassen, Roger.
The main objective of this research is to propose a data-driven approach to estimate the amenity values of restoring urban forest landscapes at potential target sites. The approach allows establishing the overall price-driving time relationship between the amenity values attributable to both deforested and forested areas and their proximities to housing locations within a given community. Establishing the overall price-driving time relationship is important because the hedonic price model cannot be used to estimate the amenity values of yet to be restored urban forest landscapes that do not exist at the time of housing sales transactions. We estimated the sum of the differences between amenity values of deforested and forested areas on housing prices...
Tipo: Working Paper Palavras-chave: Urban forest landscapes; Spatial hedonic model; Travel distance; Land Economics/Use.
Ano: 2012 URL: http://purl.umn.edu/123552
Imagem não selecionada

Imprime registro no formato completo
AN ANALYSIS OF FACTORS ASSOCIATED WITH COMPOSTING BEHAVIOR AT THE HOUSEHOLD LEVEL AgEcon
Park, William M.; Lamons, Kevin S.; Roberts, Roland K..
Drawing upon telephone survey data, a logit probability analysis was conducted to identify household characteristics as well as social and institutional factors associated with backyard composting of yard and food wastes. Highly significant predictors included household gardening, perception of effort required, peer influence, and a compost bin sale program.
Tipo: Conference Paper or Presentation Palavras-chave: Consumer/Household Economics; Institutional and Behavioral Economics.
Ano: 1998 URL: http://purl.umn.edu/20836
Imagem não selecionada

Imprime registro no formato completo
AN ANALYSIS OF THE IMPACT OF ENERGY PRICE ESCALATIONS DURING THE 1970S ON HAWAII BEEF PRODUCTION AND PRICES AgEcon
Roberts, Roland K.; Vieth, Gary R.; Nolan, James C., Jr..
A quarterly econometric model of the Hawaii beef production sector is estimated. Energy prices influence the model through Hawaii beef and feed prices which are a function of Mainland-to-Hawaii freight rates. Energy prices also influence the decision of whether to allocate feeder animals to feedlots or pasture. Through simulation, it was found that rapidly increasing energy prices after 1973 resulted in a 22 percent reduction in total Hawaii beef production. The composition of production also changed toward more grain fed and less grass fed beef. Given these results, other state and national beef modelers might find it useful to include energy prices in their models.
Tipo: Journal Article Palavras-chave: Livestock Production/Industries; Resource /Energy Economics and Policy.
Ano: 1984 URL: http://purl.umn.edu/32370
Imagem não selecionada

Imprime registro no formato completo
ANALYSIS OF BREAKEVEN YIELD GAINS AND INPUT COST SAVINGS FOR A COTTON YIELD MONITORING SYSTEM AgEcon
Larson, James A.; English, Burton C.; Roberts, Roland K.; Cochran, Rebecca L..
Cotton yield monitors are a new technology and their costs have not been thoroughly evaluated. This research evaluated yield gains and input savings required to cover the cost of a monitor. Spreading monitor costs over multiple VRT decisions reduces the required yield gain or cost savings for any one decision.
Tipo: Conference Paper or Presentation Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003 URL: http://purl.umn.edu/35081
Imagem não selecionada

Imprime registro no formato completo
ASSESSING SPATIAL BREAK-EVEN VARIABILITY IN FIELDS WITH TWO OR MORE MANAGEMENT ZONES AgEcon
English, Burton C.; Mahajanashetti, S.B.; Roberts, Roland K..
Farmers are interested in knowing whether applying inputs at variable rates across a field is economically viable. The answer depends on the crop, the input, their prices, the cost of variable rate technology (VRT) versus uninform rate technology (URT), and the spatial and yield response variability within each field. Methods were investigated for determining the range of spatial variability over which the return to VRT covers its additional cost compared with URT in fields with multiple management zones. Models developed in this article, or variants thereof, could be used to help farmers make the VRT adoption decision.
Tipo: Journal Article Palavras-chave: Management zones; Nitrogen; Precision farming; Site-specific management; Spatial break-even variability proportions; Spatial variability; Variable rate technology; Yield response variability; Farm Management.
Ano: 2001 URL: http://purl.umn.edu/15450
Imagem não selecionada

Imprime registro no formato completo
Changes in Producers’ Perceptions of Within-field Yield Variability Following Adoption of Cotton Yield Monitors AgEcon
Rejesus, Roderick M.; Marra, Michele C.; Roberts, Roland K.; English, Burton C.; Larson, James A.; Paxton, Kenneth W..
Tipo: Conference Paper or Presentation Palavras-chave: Precision Farming; Risk; Yield Monitor; Yield Variability; Yield Perceptions; Spatial Yield Distributions; Within Field Variability; Farm Management; Production Economics; Risk and Uncertainty; Q12; Q16.
Ano: 2010 URL: http://purl.umn.edu/60971
Imagem não selecionada

Imprime registro no formato completo
CHOICE OF TECHNOLOGY: THE CASE OF GRASS FED VERSUS GRAIN FED CATTLE IN HAWAII AgEcon
Garrod, Peter V.; Roberts, Roland K..
A model describing the choice of technology is developed from theoretical considerations. It is shown that the model can be approximated using a logit function. Estimates of short-run elasticities are easily obtained. The model is then applied to the decision to place feeder cattle in confined feeding situations or on range. With one possible exception, the results are consistent with theoretical expectations and with previous studies.
Tipo: Journal Article Palavras-chave: Livestock Production/Industries.
Ano: 1983 URL: http://purl.umn.edu/32091
Imagem não selecionada

Imprime registro no formato completo
DEMAND FOR PLANT NUTRIENTS IN TENNESSEE DISAGGREGATED BY MIXED FERTILIZERS AND DIRECT APPLICATION MATERIALS AgEcon
Roberts, Roland K.; Garrod, Peter V..
When obtaining nitrogen (N), phosphate (P) and potash (K), purchasing decisions concerning the quantity and the form of each plant nutrient must be made. Logit models are estimated for the choice-of-form decision by considering those variables influencing the probability that plant nutrients will be purchased in Tennessee as part of a mixed fertilizer or as direct application materials. Parameter and elasticity estimates can be used by fertilizer manufacturers and distributors to anticipate changes in the composition of demand for plant nutrients in Tennessee.
Tipo: Journal Article Palavras-chave: Crop Production/Industries.
Ano: 1987 URL: http://purl.umn.edu/30219
Imagem não selecionada

Imprime registro no formato completo
Economic Analysis of the Effects of Winter Cover Crops on No-Tillage Corn Yield Response to Fertilizer Nitrogen AgEcon
Roberts, Roland K.; Larson, James A.; Tyler, Donald D.; Duck, Bob N.; Dillivan, Kim D..
Tipo: Conference Paper or Presentation Palavras-chave: Crop Production/Industries.
Ano: 1997 URL: http://purl.umn.edu/35851
Imagem não selecionada

Imprime registro no formato completo
ECONOMIC AND ENVIRONMENTAL BENEFITS OF VARIABLE RATE APPLICATION OF NITROGEN TO CORN FIELDS: ROLE OF VARIABILITY AND WEATHER AgEcon
English, Burton C.; Mahajanashetti, S.B.; Roberts, Roland K..
The use of meta-response functions based on EPIC-generated data resulted in comparisons between variable (VRAT) and uniform rate application technologies for 36 simulated fields. VRAT was more profitable and less nitrogen was lost to the environment in most cases. When spatial variability was small, uniform rate application techniques were adopted. However, when nitrogen use is restricted, VRAT is used on all simulated fields.
Tipo: Conference Paper or Presentation Palavras-chave: Precision farming; Site-specific farming; Spatial variability; Nitrogen restriction; Rainfall; EPIC; Crop growth simulation model; Meta-response functions; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy.
Ano: 1999 URL: http://purl.umn.edu/21533
Registros recuperados: 79
Primeira ... 1234 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional