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| Registros recuperados: 237 | |
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| Tarkalson, D.D.; Brown, B.; Kok, H.; Bjorneberg, D.L.. |
| The sustainability of straw removal from wheat and barley fields from the standpoint of its effects on soil properties and nutrient cycling is a concern. A recent literature review reveals that there is no negative effect of small grain straw removal on soil organic carbon (SOC) content with irrigated conditions. With rainfed conditions, the results could be more variable and depend on site productivity. Large amounts of nutrients are removed when straw is removed, accelerating the rate of nutrient depletion and cost of replacing these nutrients. |
| Tipo: Article |
Palavras-chave: Soil; Water. |
| Ano: 2009 |
URL: http://eprints.nwisrl.ars.usda.gov/1335/1/1312.pdf |
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| Robinson, John R.C.; Michelsen, Ari M.; Gollehon, Noel R.. |
| This study extends and refines a previous model and provides estimates of the economic value of water shortages from shortfalls in Mexican deliveries to the U.S. In the process, we identify and evaluate a range of crop choices, appropriate irrigation technology use, water source substitution, and other mitigation strategies used by farmers to deal with water shortages. The effects of exogenous crop price and yield risk, as well as and other structural considerations are incorporated in deriving the marginal value of irrigation water for reference drought years. Results show that South Texas farmers react to risk by diversifying their crop mix, which in turn has implications for the imputed value of water and soil resources. The derived shadow price of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Water; Irrigation; Rio Grande; Optimization; Resource /Energy Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/19464 |
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| Guardado Plascencia, Martín. |
| Las acciones y programas encaminados a la tecnificación y modernización de los distritos de riego del país han sido diseñados para mejorar la infraestructura de estos y hacer un uso eficiente del agua. Un parámetro que permite la evaluación de estas mejoras es la productividad que presentan los cultivos, relacionando su rendimiento y el aprovechamiento del agua. Con el propósito de determinar el impacto que han tenido las acciones encaminadas a mejorar la infraestructura en el distrito de riego 053 “Estado de Colima”, se recopiló, proceso y organizó la información de superficie cosechada para los cultivos perennes, que han recibido la mayor inversión para la tecnificación y modernización de las redes de conducción y distribución del agua. El estudio se... |
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Palavras-chave: Tecnificación; Comparación; Agua; Programas; Incremento; Improvement; Comparison; Water; Programs; Increasing; Hidrociencias; Maestría Tecnológica. |
| Ano: 2013 |
URL: http://hdl.handle.net/10521/2068 |
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| Ho, Christie K.M.; Armstrong, Dan P.; Doyle, Peter T.; Malcolm, Bill. |
| Farming systems throughout the Murray-Darling Basin are under increasing scrutiny from the perspective of ecological sustainability of farm and catchment systems. In northern Victoria, the dairy industry is a major user of water, and contributes to the environmental issues. Changes in irrigation water price, availability and policy will invariably impact on the viability of dairy farming in this region, but the diversity of dairy farm systems suggests that the impact will vary between farms. Two case study farms, a 'water reliant' farm and a 'fodder reliant' farm, were used to examine economic and social impacts of changes in water price, availability and policy. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Dairy; Irrigation; Water; Agribusiness; Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/58707 |
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| Bell, Andrew Reid; Department of Environmental Studies, New York University; ab6176@nyu.edu; Ward, Patrick S.; International Food Policy Research Institute (IFPRI), Washington, D.C.; p.ward@cgiar.org; Shah, M. Azeem Ali; International Water Management Institute (IWMI), Lahore, Pakistan; Lahore University of Management Sciences (LUMS), Pakistan; a.shah@cgiar.org. |
| Conventional wisdom in many agricultural systems across the world is that farmers cannot, will not, or should not pay the full costs associated with surface water delivery. Across Organisation for Economic Co-operation and Development (OECD) countries, only a handful can claim complete recovery of operation, maintenance, and capital costs; across Central and South Asia, fees are lower still, with farmers in Nepal, India, and Kazakhstan paying fractions of a U.S. penny for a cubic meter of water. In Pakistan, fees amount to roughly USD 1-2 per acre per season. However, farmers in Pakistan spend orders of magnitude more for diesel fuel to pump groundwater each season, suggesting a latent willingness to spend for water that, under the right conditions, could... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Agent-based model; Efficiency; Equity; Irrigation; Pakistan; Water. |
| Ano: 2016 |
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| Gilmour, Brad; Gurung, Rajendra Kumar. |
| With a population of about 1.1 billion, India is expected to overtake China as the world's most populous country by 2030. India's economy ranks as Asia's third largest, after Japan and China, and is now one of the world's fastest growing. While growth has led to significant reductions in poverty, India still ranks among the world's low income countries in terms of income per capita. Nevertheless, economic growth has resulted in a burgeoning middle-class. India's agriculture sector accounts for 18% of GDP, and employs around 60% of the workforce. Rice, wheat, cotton, oilseeds, jute, tea, sugarcane, milk and potatoes are India's major agricultural commodities. With its growing urban middle-class and increasing influence in global affairs, India's policies... |
| Tipo: Report |
Palavras-chave: India; Economic growth; Agricultural policy; Water scarcity; Market regulations; Agriculture; Water; Agricultural and Food Policy; Environmental Economics and Policy; Institutional and Behavioral Economics; Land Economics/Use; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/46456 |
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| Zhang, T.C.; Ma, Rui; Bartelt-Hunt, S.L.; Qi, Yong; Kranz, W.L.; Snow, D.D.; Mader, T.L.; Shapiro, C.A.; Shelton, D.P.; Van Donk, S.J.; Tarkalson, D.D.. |
| In this study, batch sorption and desorption experiments were conducted for testosterone using four agricultural soils and five clay minerals. Significant differences in sorption behavior were observed between abiotic and biotic systems. The Freundlich sorption coefficient Kf (µg per g)/(µg per mL) ranged from 8.53 to 74.46 for soils and from 35.28 to 1243 for clays. The maximum sorption capacity (µg per g) of soils ranged from 25.25 to 440.61 for soils and 168.46 to 499.84 for clays. Correlation of sorption model parameters with soil properties indicated that both clay content and soil organic matter are important variables in predicting testosterone sorption behavior. Observed testosterone desorption from agricultural soils ranged from approximately 14... |
| Tipo: Article |
Palavras-chave: Soil water (soil moisture); Soil; Water. |
| Ano: 2015 |
URL: http://eprints.nwisrl.ars.usda.gov/1606/1/1564.pdf |
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| Viola,Teresa Herr; Ribeiro,Andréa Machado Leal; Penz Júnior,Antônio Mário; Viola,Eduardo Spillari. |
| The experiment was carried out to evaluate the effect of 0%, 10%, 20%, 30%, and 40% water restriction (WR) on broiler performance, behavior, organ development (heart, leg, proventriculus and gizzard, liver, and intestines), and intestinal micrometry. Four hundred and eighty ROSS 308 male broilers were raised in battery cages measuring 0.72 m², from 1 to 21 days of age. Feed was offered ad libitum, and environmental temperatures were kept in thermoneutral conditions. Water intake was estimated based on a control group, two days older than the experimental birds, with same initial weight. A linear reduction on bird performance, duodenal villi height, and fresh organs weight were observed as WR increased. At 21 days of age, for each 1% WR, a weight loss of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavior; Chickens; Duodenal morphology and histology; Organs; Water. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000200015 |
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| Registros recuperados: 237 | |
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