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	Provedor de dados AgEcon (2) Autor Lauer, Joseph G. (1) Ma, Xingliang (1) Mitchell, Paul D. (1) Nolan, Elizabeth (1) Santos, Paulo (1) Shi, Guanming (1) Mais... Palavra-chave Crop Production/Industries (2) Hybrid seed corn (2) Agribusiness (1) Bt corn (1) Corn borer (1) D2 (1) D21 (1) Farm Management (1) Fixed effects (1) GM traits (1) Herbicide tolerance (1) Herfindahl index (1) Hyperbolic yield model (1) Industrial Organization (1) O33 (1) O34 (1) Production Economics (1) Q1 (1) Q12 (1) Random effects (1) Mais... Tipo do documento Conference Paper or Presentation (2) Ano 2010 (1) 2009 (1) País United States (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Measuring the Contribution of Genetic Characteristics as an Indicator of Innovation: The Case of Corn in the USA, 1990-2009 AgEcon Nolan, Elizabeth; Santos, Paulo. Intellectual Property Rights (IPR) regimes for plant breeding are generally justified on the basis that they encourage innovation. Introduction of IPR regimes for plant varieties in the United States has led to increased concentration, but it is less clear whether IPRs have promoted useful innovation, as measured by productivity of available corn hybrids. There are difficulties in finding a satisfactory measure of innovation in plant breeding, and in this paper we propose a procedure. Results from the annual corn hybrid trials conducted by 11 US universities over the 20 years from 1990 to 2009, at 365 separate locations in the 11 states, have been collated. This set of unbalanced panel data for grain corn hybrid trials has been used in a fixed effects... Tipo: Conference Paper or Presentation Palavras-chave: Hybrid seed corn; GM traits; Varietal change; Fixed effects; Random effects; Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies; O33; O34. Ano: 2010 URL: http://purl.umn.edu/61333 Effect of Prices, Traits and Market Structure on Corn Seeding Density AgEcon Mitchell, Paul D.; Shi, Guanming; Ma, Xingliang; Lauer, Joseph G.. Recent agronomic research finds that economically optimal seeding densities have likely increased for many Midwestern corn farmers as a result of genetic improvements including new GM traits such as Bt corn and herbicide tolerance. We derive a per acre demand model for hybrid seed corn to examine the determinants of corn seeding densities and estimate the model using a large data set of individual farmer seed corn purchases. Current results identify factors other than prices affecting farmer corn seeding densities. Among these factors are the GM trait of the seed corn, measures of the local seed corn market structure, seed purchase source and intended end use. We interpret these effects in terms of information effects—farmers with more/better access to... Tipo: Conference Paper or Presentation Palavras-chave: Hybrid seed corn; Bt corn; Herbicide tolerance; Herfindahl index; Corn borer; Rootworm; Hyperbolic yield model; Agribusiness; Crop Production/Industries; Farm Management; Industrial Organization; Production Economics; D2; D21; Q1; Q12. Ano: 2009 URL: http://purl.umn.edu/49520 Registros recuperados: 2 Primeira ... 1 ... Última

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