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| Registros recuperados: 48 | |
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| Rosolem,Ciro Antonio; Silva,Rosemeire Helena da; Esteves,José Antonio de Fátima. |
| Cotton (Gossypium hirsutum) is known to have a high requirement for K and to be very sensitive to low soil pH. Most of K reaches plant roots by diffusion in the soil. As K interacts with Ca and Mg, liming can interfere in K movement in the soil, affecting eventually the plant nutrition. The objective of this work was to study the effect of dolomitic lime and 0, 15, 30, 45 and 60 g kg-1 of K on the supply of K to cotton roots. Cotton plants were grown up to 40 days in 5 L pots containing a Dark Red Latosol (Typic Haplusthox) with 68% and 16% of sand and clay, respectively. There was an increase in dry matter yields and in K accumulation due to K fertilization. Root interception of soil K was also increased by K application, but was not affected by lime.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Mass; Diffusion; Liming materials; Roots; Growth; Plant nutrition. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000500012 |
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| Whitacre, Brian E.. |
| Rural communities suffer from both supply and demand-side disadvantages when dealing with Internet access. Telecommunications companies are less likely to provide them with needed infrastructure due to lower population densities, and they also tend to have lower levels of specific factors known to influence the access decision such as education and income. This study looks at the broadband Internet setting in Oklahoma over a 3-year period, examining the diffusion of both infrastructure and access rates. A non-linear decomposition technique allows for measurement of how specific characteristics, including the availability of infrastructure, contribute to observed metropolitan – micropolitan or metropolitan – noncore “digital divides.” The results... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Broadband; Internet; Diffusion; Rural; Community/Rural/Urban Development; R11; O18; C1. |
| Ano: 2009 |
URL: http://purl.umn.edu/55929 |
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| Clark, Richard A.. |
| The theory and practice of sustainable improvement and innovation partnerships and networks design and management can be enhanced in agricultural industries. The BPP project can contribute to enhanced real-world practices, and the research and development of better mechanisms, for the design and management of innovation partnerships and networks. The Partnership and Network Strategy is designed to accelerate the rate, scale and impact of valuable improvements and innovations in the beef industry by involving key players in the industry and ensuring support for all partners. |
| Tipo: Article |
Palavras-chave: Partnerships; Networks; Clusters; Networking; Support; Dissemination; Diffusion; Farm Management. |
| Ano: 2008 |
URL: http://purl.umn.edu/122183 |
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| Sykuta, Michael E.; Klein, Peter G.; James, Harvey S., Jr.. |
| The rise of contract farming and vertical integration is one of the most important changes in modern agriculture. Yet the adoption and diffusion of these new forms of organization has varied widely across regions, commodities, or farm types, however. Transaction cost theories and the like are not fully effective at explaining the variation of adoption rates of different organizational forms, in part because of their inherent static nature. In order to explain the adoption, diffusion and evolution of organizational form, a more dynamic framework is required. This paper lays out such a framework for understanding the evolution of organizational practices in U.S. agriculture by drawing on existing theories of economic organization, the diffusion of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Contracting; Vertical integration; Organizational innovation; Diffusion; Institutional and Behavioral Economics; L14; L22; Q13; O33. |
| Ano: 2005 |
URL: http://purl.umn.edu/19390 |
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| Desquilbet, Marion; Lemarie, Stephane; Levert, Fabrice. |
| In this paper, we conduct an empirical investigation of potential adoption of herbicide-tolerant (HT) genetically modified (GM) rapeseed in France. Our aim is to study ex ante the potential impact of their adoption in France, in terms of adoption level, economic gains, and distribution of these gains between farmers and input suppliers. We use French survey data about current plant protection practices, in order to compute pesticide costs with conventional (i.e., non GM) crops for individual farms. Then, based on results of technical studies about GM variety trials in France, we compute a predicted pesticide cost with the GM variety. Next, we study adoption rates and gains or losses of farmers (adopters and non adopters) and upstream companies (sellers of... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Genetically modified organisms; Innovation; Diffusion; Rapeseed; Consumer/Household Economics. |
| Ano: 2002 |
URL: http://purl.umn.edu/24975 |
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| Ferto, Imre; Forgacs, Csaba. |
| The paper deals with organic produce in one of the largest and, concerning organic production one of the most diffused counties in Hungary, Pest County located in the north-central part of the country. Factors influencing farmers’ decision on adopting or not e.g. farm size, farm type, location, structure, market for organic products, existence of organic AEM were analysed. Hypotheses based on previous empirical literature were tested by a model explicitly accounting for the effects of farm-specific variables like age, education, size of farms and share of rented land. Logit model was estimated on a cross-section data set of Hungarian farmers for the period 2007. It appears that education has a positive impact on the choice between conventional and organic... |
| Tipo: Journal Article |
Palavras-chave: Innovation; Attitudes; Organic production; Diffusion; Agri-environmental measures; Agricultural and Food Policy; Crop Production/Industries; Food Consumption/Nutrition/Food Safety. |
| Ano: 2009 |
URL: http://purl.umn.edu/53568 |
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| Lisboa,Cícera G. C. de; Gomes,Josivanda P.; Figueirêdo,Rossana M. F. de; Queiroz,Alexandre J. de M.; Diógenes,Adelino de M. G.; Melo,João C. S. de. |
| ABSTRACT The aim of this study was to obtain the effective diffusivity of yacon potato in fixed-bed dryer at different temperatures (50, 60 and 70 ºC) and drying air velocities (1.0, 1.5 and 2.0 m s-1). Non-linear regression analysis was performed by the Quasi-Newton method using the program Statistica 7.0, where the parameters of the models were estimated as a function of the drying air temperature. Approximation of Diffusion, Two Terms, Henderson & Pabis, and Page models fitted well the experimental data. Drying air temperature and speed influenced the drying time of the samples. The effective diffusivity increased with increasing temperature, ranging from 1.18 x 10-9 to 2.15 x 10-9 m2 s-1. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Smallanthus sonchifolia; Mathematical modelling; Diffusion. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000800564 |
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| Registros recuperados: 48 | |
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