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Registros recuperados: 12
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CLIMATE CHANGE IMPACTS ON US AGRICULTURE AgEcon
Beach, Robert H.; Thomson, Allison M.; McCarl, Bruce A..
There is general consensus in the scientific literature that human-induced climate change has taken place and will continue to do so over the next century. The Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change concludes with “very high confidence” that anthropogenic activities such as fossil fuel burning and deforestation have affected the global climate. The AR4 also indicates that global average temperatures are expected to increase by another 1.1°C to 5.4°C by 2100, depending on the increase in atmospheric concentrations of greenhouse gases that takes place during this time. Increasing atmospheric carbon dioxide levels, temperature increases, altered precipitation patterns and other factors influenced by climate have...
Tipo: Conference Paper or Presentation Palavras-chave: Climate change; Crop yields; EPIC; FASOM; Crop Production/Industries; Environmental Economics and Policy; International Relations/Trade; Land Economics/Use; Resource /Energy Economics and Policy; C61; Q18; Q54.
Ano: 2010 URL: http://purl.umn.edu/91393
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Eficiência agronômica de fosfatos naturais e artificiais nas condições edafo-climatológicas da Amazônia. Infoteca-e
SOUZA, G. F. de; OLIVEIRA, R. F. de; MATOS, A. de O.; CRUZ, E. de S..
1980
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Fertilizante fosfato; Rendimento de cultivo; Superfosfato triplo; Bragança; Tracuateua; Pará; Amazônia; Brasil; Phosphate fertilizers; Crop yields; Superphosphate.
Ano: 1980 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/378128
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Improved Fallows in Eastern Zambia: History, Farmer Practice and Impacts AgEcon
Kwesiga, Freddie; Franzel, Steven Charles; Mafongoya, Paramu; Ajayi, Olu Clifford; Phiri, Donald; Katanga, Roza; Kuntashula, Elias; Place, Frank; Chirwa, Teddy.
The decline in soil fertility in smallholder systems is a major factor inhibiting equitable development in much of sub-Saharan Africa. Some areas fallow in order to strength soil fertility for later planting, but as populations increase, demand follows. and continuous cropping becomes the norm and there is a reduction in yields. This case study summarizes the development of improved tree fallows by researchers and farmers in eastern Zambia to help solve the problem of poor soil fertility. Many farmers are finding that by using improved fallows, they can substitute relatively small amounts of land and labor for cash, which they would need to buy mineral fertilizer. The study has three phases: the historical background (phase 1); an assessment of problems,...
Tipo: Working or Discussion Paper Palavras-chave: Zambia; Fallows; Crop yields; Soil fertility; Crop Production/Industries.
Ano: 2005 URL: http://purl.umn.edu/59247
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Income and equity effects of crop productivity growth under alternative foreign trade regimes: a CGE analysis for the Philippines AgEcon
Bautista, Romeo M.; Robinson, Sherman.
"September 1996." Includes bibliographical references (p. 17-18). Published, in 1997, in Asian Journal of Agricultural Economics 2(2): 177-194.
Tipo: Working or Discussion Paper Palavras-chave: Philippines -- Foreign economic relations; Philippines -- Economic conditions; Crop yields; Income -- Philippines; International Relations/Trade; Productivity Analysis.
Ano: 1996 URL: http://purl.umn.edu/97762
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Land Use Consequences of Crop Insurance Subsidies AgEcon
Miao, Ruiqing; Feng, Hongli; Hennessy, David A..
There have long been concerns that federal crop insurance subsidies may significantly impact land use decisions. It is well known that classical insurance market information asymmetry problems can lead to a social excess of risky land entering crop production. Our conceptual model shows that the problem will arise absent any information failures. This is because the subsidy is i) proportional to acres planted, and ii) greatest for the most production risky land. Using farm-level data, we follow this observation through to establish the implications of subsidies for the extent of crop production, with particular emphasis on U.S. regions where the cropland growth is likely to have marked adverse environmental impacts. Simulation results show that when...
Tipo: Working or Discussion Paper Palavras-chave: Crop insurance; Land use; Crop yields; Yield risk measurement; Agricultural and Food Policy; Crop Production/Industries; Land Economics/Use; Q15; Q18; Q24.
Ano: 2011 URL: http://purl.umn.edu/103891
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Práticas agroflorestais visando ao manejo de vegetações secundárias: uma abordagem com ênfase em experiências amazônicas. Repositório Alice
SÁ, T. D. de A.; ALEGRE, J..
2001
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Vegetação secundária; Manejo florestal; Capoeira; Produtividade de cultivo; Biomassa; Secondary forests; Forest management; Follow; Crop yields; Biomass.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/395404
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Produtividade de seis cultivares de maracujazeiro-azedo durante tres anos em Vargem Bonita, DF. Repositório Alice
MELO, K.T.; MANICA, I.; JUNQUEIRA, N.T.V..
Avaliou-se a produtividade de cultivares de maracujazeiro-azedo (Passiflora edulis), com vistas à seleção de um material mais produtivo nas condições do Distrito Federal para frutos destinados ao consumo in natura. As cultivares Maguari, CSB Marília, NJ3 Vermelho, CSB Marília x NJ3 Vermelho, Roxo Australiano e Seleção DF foram avaliadas durante três anos de produção, em Latossolo Vermelho-Amarelo, no sistema de espaldeira vertical. A cultivar Maguari apresentou porcentagem de germinação das sementes superior à das demais cultivares. A média da altura das plantas das cultivares Seleção DF e Roxo Australiano foi superior à das outras quatro cultivares. A cultivar Maguari apresentou o maior vigor vegetativo durante os três anos de experimento, e o menor...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Passiflora edulis; Variedades; Cerrados; Rendimento de culturas; Varieties; Savannas; Crop yields.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104006
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Recent Developments in Unit Root Tests and Historical Crop Yields AgEcon
Zapata, Hector O.; Maradiaga, David Isaias; Pujula, Aude Liliana; Dicks, Michael R..
This study conducts an investigation on the application of classical unit-root tests using parametric tests (the augmented Dickey-Fuller, 1979 – ADF), and nonparametric tests (Phillips and Perron, 1988—PP) to corn and soybean yields in the Delta states using county-level data from 1961 to 2009. The main concern of the paper is to assess what would be drawn about nonstationarity in crop yields using these tests versus using modified versions of these tests (Ng and Perron, 2001) that are assumed to solve size and power problems associated with the ADF and PP tests. The investigation focuses on methodological aspects of the classical tests, uncovers the nature of filtered yields often needed prior to density estimation, sheds light on the effect of lag...
Tipo: Conference Paper or Presentation Palavras-chave: Crop yields; Nonstationarity; Unit-roots; Density estimation; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011 URL: http://purl.umn.edu/103871
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Sources of Agricultural Growth in India: Role of Diversification towards High-Value Crops AgEcon
Joshi, P.K.; Birthal, Pratap Singh; Minot, Nicholas.
This study examines the sources of crop income growth in Indian agriculture over the 1980s and 1990s. Using a method developed by Minot (2003), the analysis decomposes crop income growth into the contribution of yield increases, area expansion, price increases, and diversification from low-value crops to higher-value crops. The results confirm that at the national level, technology (higher yield) was the main source of crop income growth during 1980s, while rising prices and diversification emerged as the dominant sources of growth in agriculture during 1990s. Diversification towards higher-value crops such as fruits and vegetables accounted for about 27% of crop income growth in the 1980s and 31% in the 1990s. However, these national averages hide...
Tipo: Working or Discussion Paper Palavras-chave: Crops; Income growth; Agriculture; Grain production; Agricultural research; Research and development; High value commodities; Crop yields; Prices; High-value crops; Decomposition; Crop Production/Industries.
Ano: 2006 URL: http://purl.umn.edu/58572
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SPATIAL PATTERNS OF CROP YIELDS IN LATIN AMERICA AND THE CARIBBEAN AgEcon
Wood, Stanley; You, Liangzhi; Zhang, Xiaobo.
From a theoretical perspective crop yields should tend to converge over time and space as: growth in yield potential exhibits diminishing returns; an increasing share of farmers shift to using high yielding varieties (HYVs); barriers to the free flow of knowledge and information are removed; and significant investments continue to be made in supporting institutions whose mandates include facilitating and accelerating the cross-border flow of improved agricultural technologies. Using a new, sub-national crop yield database for Latin America and the Caribbean (LAC) we examine whether convergence is indeed occurring, and discover it is not. On the contrary, there is evidence of divergence. We test three hypotheses that might help account for this finding:...
Tipo: Working or Discussion Paper Palavras-chave: Crop yields; Maize; Rice; Soybeans; Latin America; Caribbean; South America; Crop Production/Industries.
Ano: 2004 URL: http://purl.umn.edu/60322
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The Effects of Drought on Crop Yields and Yield Variability in Sahel AgEcon
Boubacar, Inoussa.
Drought is widespread in Sahel, and its persistent occurrence has caused substantial damages to the agricultural sector. The severity of drought and the related damages to the agricultural sector are expected to increase due to global warming. In this paper, I examine the economic impacts of drought on Sahel agriculture. The maximum likelihood estimators of the Just-Pope stochastic production function indicate that the direction of the effects of climate variables is similar across crops, but their magnitudes differ. Specifically, drought as measured by a 6-month standardized precipitation index, poor rainfall spread, and degree-days have adverse effects on crop yields. The results are robust to alternative estimation methods.
Tipo: Conference Paper or Presentation Palavras-chave: Crop yields; Drought; Stochastic production model; Sahel; Crop Production/Industries; Environmental Economics and Policy; International Development; O13; O55; Q54.
Ano: 2010 URL: http://purl.umn.edu/56322
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The Production and Price Impact of Biotech Crops AgEcon
Brookes, Graham; Yu, Tun-Hsiang (Edward); Tokgoz, Simla; Elobeid, Amani E..
Biotech crops have now been grown commercially on a substantial global scale since 1996. This paper examines the production effects of the technology and impacts on cereal and oilseed markets through the use of agricultural commodity models. It analyses the impacts on global production, consumption, trade and prices in the soybean, canola and corn sectors. The analysis suggests that world prices of corn, soybeans and canola would probably be, respectively, 5.8%, 9.6% and 3.8% higher, on average, than 2007 baseline levels if this technology was no longer available to farmers. Prices of key derivatives of soybeans (meal and oil) would also be between 5% and 9% higher, with rapeseed meal and oil prices being about 4% higher than baseline levels. World prices...
Tipo: Working or Discussion Paper Palavras-chave: Biotechnology; Cereals; Crop yields; Oilseeds; Price effects; Productivity.; Crop Production/Industries; Demand and Price Analysis; Productivity Analysis.
Ano: 2010 URL: http://purl.umn.edu/56984
Registros recuperados: 12
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