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Aggregate distribution, stability and release of water dispersible clay for two subtropical Oxisols Scientia Agricola
Azevedo,Antonio Carlos de; Schulze,Darrel Gene.
The behavior of a soil regarding the dispersion and aggregation of its particles is very important for the development of environmental and agricultural soil functions. This study was conducted to determine how aggregate distribution and stability are impacted by land uses and how the release of Water Dispersible Clay (WDC) relates to disaggregation in Oxisols from subtropical Brazil. Samples from two Oxisols, collected at three depths from sites under no-tillage (NT), conventional tillage (CT) and native vegetation (NV) land uses were shaken in 250 mL plastic bottles for intervals up to 27 hours. The mass of aggregates was measured in five size classes ranging from 53 to 2000 µm. Most aggregates larger than 500 mm disappeared during the first 7.5 hours of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Land use; Disaggregation; Soil tillage; Soil management.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100006
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Growth Options and Poverty Reduction in Ethiopia: A Spatial Economywide Model Analysis for 2004-15 AgEcon
Diao, Xinshen; Nin Pratt, Alejandro; Ghautam, Madhur; Keough, James; Chamberlin, Jordan; You, Liangzhi; Puetz, Detlev; Resnick, Danielle; Yu, Bingxin.
Also published as EDRI-ESSP Policy Working Paper No. 2: Xinshen Diao; Alejandro Nin Pratt; Madhur Ghautam; James Keough; Jordan Chamberlin; Liangszi You; Detlev Puetz; Danielle Resnick; Bingxin Yu. 2005. Growth options and poverty reduction in Ethiopia: a spatial, economywide model analysis for 2004-15.
Tipo: Working or Discussion Paper Palavras-chave: Poverty alleviation; Agricultural growth; Agricultural sector; Millennium Development Goals; Spatial analysis (Statistics); Disaggregation; Household surveys; Ethiopia; Africa; Food Security and Poverty; International Development.
Ano: 2005 URL: http://purl.umn.edu/58383
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Spatial Disaggregation of Agricultural Production Data AgEcon
Howitt, Richard E.; Reynaud, Arnaud.
In this paper we develop a dynamic data-consistent way for estimating agricultural land use choices at a disaggregate level (district-level), using more aggregate data (regional-level). The disaggregation procedure requires two steps. The first step consists in specifying and estimating a dynamic model of land use at the regional level. In the second step, we disaggregate outcomes of the aggregate model using maximum entropy (ME). The ME disaggregation procedure is applied to a sample of California data. The sample includes 6 districts located in Central Valley and 8 possible crops, namely: Alfalfa, Cotton, Field, Grain, Melons, Tomatoes, Vegetables and Subtropical. The disaggregation procedure enables the recovery of land use at the district-level with an...
Tipo: Conference Paper or Presentation Palavras-chave: Disaggregation; Bayesian method; Maximum entropy; Land use; Production Economics; C11; C44; Q12.
Ano: 2002 URL: http://purl.umn.edu/24961
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The Art of Exceptions: Sensitive Products in the Doha Negotiations AgEcon
Gouel, Christophe; Mitaritonna, Cristina; Ramos, Maria Priscila.
It is necessary for multilateral trade negotiations to include exceptions to accommodate politically sensitive sectors. However, given the highly concentrated distribution of agricultural protection, too many exceptions put at risk the objectives of World Trade Organization. This paper assesses the delicate balance required, based on the case of agricultural trade protection in Europe and Japan, two countries where tariff dismantling in the agricultural sector is a particularly sensitive issue. Since agricultural border protection is heterogeneous, we avoid aggregation bias by extending a multi-country computable general equilibrium model to the product level. This allows us to combine the assets from general equilibrium and partial equilibrium modeling,...
Tipo: Working or Discussion Paper Palavras-chave: Agricultural trade; Doha Development Agenda; CGE model; Disaggregation; Sensitive products; Tariff-rate quotas; Agricultural and Food Policy; C68; F13; F17; Q17; Q18.
Ano: 2010 URL: http://purl.umn.edu/115431
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