66 research outputs found
Resultados econÎmicos de sistemas de produção conduzidos durante seis anos em Londrina, PR.
Plantas daninhas: o banco de sementes e a sustentação de tecnologias na cultura da soja.
Neste documento sĂŁo apresentados e discutidos resultados de pesquisa referentes a bancos de sementes de plantas daninhas, obtidos em experimentos conduzidos na Embrapa Soja, complementados com outros da literatura. Tal conhecimento Ă© Ăștil para subsidiar decisĂ”es a serem tomadas em nĂvel de produtor.bitstream/item/59059/1/Documentos-302.pd
Macrophomina phaseolina em soja.
Macrophomina phaseolina em soja. CaracterĂsticas do fungo; Sintomas; Fatores predisponentes Ă infecção; Variabilidade genĂ©tica; Rotação de culturas e manejo do solo; ResistĂȘncia genĂ©tica.bitstream/item/104251/1/Doc.-346-OL.pd
Practical issues affecting the utility of field survey data for biodiversity monitoring
There is growing emphasis on monitoring biodiversity in European waters not least due to the ECâs recent Marine Strategy Framework Directive (MSFD) listing biodiversity as one descriptor of âGood Environmental Statusâ (GES). Member States already have various monitoring surveys in place, in particular groundfish and other fisheries surveys, which may provide a cost-effective way of assessing
some elements of biodiversity. The MSFD recognises the âneed to ensure, as far as possible, compatibility with existing programmesâ. Although existing field surveys are a potential source of quantitative data for
examining spatial and temporal biodiversity patterns, it must be acknowledged that such surveys were often not originally designed to monitor âbiodiversityâ, and long-term surveys may have had changes in survey design at some point, and/or subtle changes in survey protocols over time. Field surveys for infauna and plankton typically collect and preserve samples at sea, and subsequent laboratory work includes the use of reference collections, quality assurance and longer-term sample storage. Surveys with towed gears can collect large amounts of complex biological material which is typically processed at sea, and so
different forms of quality assurance are required. The taxonomic knowledge, experience and enthusiasm of sea-going staff can also influence the biodiversity information collected (e.g. time spent sorting complex
catches, species identification). Hence, matrices of species-station data can contain âartefactsâ that need to be understood and addressed before deriving biodiversity metrics, and may even necessitate some degree of data filtering. This paper uses field data from selected surveys to illustrate how various factors can affect âbiodiversity informationâ
O projeto de profissionalização docente no contexto da reforma educacional iniciada nos anos 1990
Survival of pathogens on soybean debris under no-tillage and conventional tillage systems
IdĂ©ias fora do lugar: o neoliberalismo como categoria de anĂĄlise das polĂticas sociais no Brasil
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