http://www.alice.cnptia.embrapa.br Ferramenta desenvolvida com o Software Livre Dspace que captura, armazena, indexa, preserva, e distribui material de pesquisa em formato digital. Buscar o Canal buscar http://www.alice.cnptia.embrapa.br/simple-search http://www.alice.cnptia.embrapa.br/handle/doc/958684 T&iacute;tulo: Análise da diversidade genética em germoplasma de Piper spp com ênfase para pimenta-do-reino (Piper nigrum L.): estudo preliminar por marcadores isoenzimáticos.<br/><br/>Autoria: GAIA, J. M. D.; MOTA, M. G. da C.; COSTA, M. R.; MARTINS, C. da S.; POLTRONIERI, M. C. http://www.alice.cnptia.embrapa.br/handle/doc/958696 T&iacute;tulo: Rice yield estimation based on weather conditions and on technological level of production systems in Brazil.<br/><br/>Autoria: MONTEIRO, J. E. B. de A.; AZEVEDO, L. da C.; ASSAD, E. D.; SENTELHAS, P. C.<br/><br/>Conte&uacute;do: The objective of this work was to evaluate an estimation system for rice yield in Brazil, based on simple agrometeorological models and on the technological level of production systems. This estimation system incorporates the conceptual basis proposed by Doorenbos & Kassam for potential and attainable yields with empirical adjusts for maximum yield and crop sensitivity to water deficit, considering five categories of rice yield. Rice yield was estimated from 2000/2001 to 2007/2008, and compared to IBGE yield data. Regression analyses between model estimates and data from IBGE surveys resulted in significant coefficients of determination, with less dispersion in the South than in the North and Northeast regions of the country. Index of model efficiency (E1') ranged from 0.01 in the lower yield classes to 0.45 in higher ones, and mean absolute error ranged from 58 to 250 kg ha-1, respectively. http://www.alice.cnptia.embrapa.br/handle/doc/958571 T&iacute;tulo: Representação de dados litoquímicos em rochas vulcânicas da formação serra geral da bacia do Paraná:uma ferramenta para investigação do potencial de uso agronômico.<br/><br/>Autoria: BERGMANN, M.; SILVEIRA, C. A. P.; BANDEIRA, R.; BAMBERG, A. L.; MARTINAZZO, R.; GRECCO, M. http://www.alice.cnptia.embrapa.br/handle/doc/958572 T&iacute;tulo: Notes on the dissemination of new technology.<br/><br/>Autoria: ALVES, E. R. de A.<br/><br/>Conte&uacute;do: Brazilian agriculture in recent years has received considerable support from the public sector. One of the primary policy tools has been the increasing financia support for research and extension. This paper deals with relationships between dissemination of new technology, production systems, agricultura1 research and extension activities. Questions are raised which have been under discussion since the origin of rural extension in 1948. The dissemination model, which is the operational basis of the Rural Extension Service under the leadership of EMBRATER, is reviewed; some problems in dissemination of technology are discussed.