Encontrados 36 documentos, a visualizar página 1 de 4
Culturas Energéticas – Potencialidades do Sorgo Sacarino nas Condições de Portugal
Calado, José; Basch, GottliebResumo O Sorghum bicolor (L.) Moench ssp. saccharatum, sorgo sacarino, é um espécie que se caracteriza por apresentar uma boa capacidade de adaptação a diversas regiões, sendo possível encontrá-la desde os 52º de latitude N e os 40º de latitude S. A capacidade de adaptação permite-lhe tolerar climas quentes e secos e solos com alguma acidez, produzindo grande quantidade de biomassa. A capacidade de produção d...
Weed emergence as affected by soil disturbance and moisture in a controlled env...
Calado, José; Basch, Gottlieb; Barros, José; Carvalho, MárioEmergence of weeds is influenced by disturbance of the top soil layer which, in general, creates favourable environmental conditions for the germination of seeds and consequent plant emergence. This study reports the influence of soil disturbance on the emergence of weeds under different soil moisture levels. The experiments were carried out under controlled environment conditions, using rings containing undi...
Culturas Energéticas – Potencialidades do Sorgo Sacarino nas Condições de Portugal
Calado, José; Basch, GottliebO Sorghum bicolor (L.) Moench ssp. saccharatum, sorgo sacarino, é um espécie que se caracteriza por apresentar uma boa capacidade de adaptação a diversas regiões, sendo possível encontrá-la desde os 52º de latitude N e os 40º de latitude S. A capacidade de adaptação permite-lhe tolerar climas quentes e secos e solos com alguma acidez, produzindo grande quantidade de biomassa. A capacidade de produção de biomas...
Weed management in winter wheat (Triticum aestivum L.) influenced by different ...
Calado, José; Basch, Gottlieb; Barros, José; Carvalho, MárioIn this study, weed management in winter wheat influenced by different soil tillage systems was investigated. The experiment was carried out under Mediterranean conditions on a Luvisol, during two growing seasons (1996/1997 and 1999/2000). Two factors (different soil tillage systems and post-emergence weed control) were studied, with two levels each: Two soil tillage systems and two levels of post-emergence wee...
LONG TERM EFFECT OF TILLAGE SYSTEM AND CROP RESIDUE MANAGEMENT ON SOIL CARBON C...
Carvalho, Mário; Basch, Gottlieb; Calado, J.M.G.; Barros, J.F.CUnder Mediterranean conditions, soils under conventional tillage farming usually have very low contents of organic matter. This situation is due to intensive soil tillage, low biomass production under rainfed conditions, and removal of cereal straw for alternative use off the field. In order to study strategies to improve soil organic matter content (SOM), a long term experiment (11 years) was established in 19...
Impact of soil tillage and land use on soil organic carbon decline under Medite...
Basch, Gottlieb; Calado, José; Barros, José; Carvalho, MárioSoils under Mediterranean climate conditions frequently have low to very low levels of soil organic matter (SOM), as a result of low biomass production under the predominantly rainfed conditions and the intensive tillage operations commonly practiced. In order to assess both short and long-term impacts of soil tillage and land use on soil organic carbon, two sets of experiments were performed. One consisted in ...
Weed emergence in autumn under temperate conditions
Calado, José; Basch, Gottlieb; Carvalho, MárioThe emergence of weed plants depends on environmental conditions, especially temperature and soil moisture. The latter is extremely important in Mediterranean environments which are characterized by irregular amount and distribution of rain throughout the year, which influences the beginning of the growth cycle of the annual species (seed germination). This paper studies the influence of rainfall, in particular...
Reduced doses of herbicides to control weeds in barley crops under temperate co...
Barros, José; Basch, Gottlieb; Calado, José; Carvalho, MárioYield losses in cereal crops under temperate climate conditions due to weed-crop competition, namely Lolium rigidum G., can reach up to 80%, depending on the season and infestation level. Nevertheless, the costs of chemical weed control and the environmental impact caused by herbicides recommend the search for strategies to reduce their input. Therefore, the aim of this work was to study the possibility of redu...
Doses reduzidas de herbicidas no controlo do Juncus bufonius L. e infestantes d...
Barros, José; Basch, Gottlieb; Freixial, Ricardo; Carvalho, MárioO estudo foi levado a cabo nos anos de 2007/08 e 2008/09 numa herdade privada no distrito de Évora (Sul de Portugal), onde a cultura do trigo é semeada após o início das chuvas de Outono. O trigo foi estabelecido usando o sistema de sementeira directa, o qual possibilita a aplicação de herbicidas de pós-emergência numa fase mais precoce do desenvolvimento das infestantes. Para controlar o Juncus bufonius L. e d...
Tratamentos Fitossanitários em Olival
Barros, José; Amante, Rui; Basch, GottliebA oliveira (Olea europea L.) é uma cultura bastante bem adaptada às condições edafo-climáticas de Portugal, onde apresenta uma grande importância socioeconómica. Actualmente, o mercado altamente competitivo obriga à ponderação de todos os factores que possam influenciar directa ou indirectamente na produção e em especial a qualidade do azeite, entre os factores que é necessário ter em conta encontra-se a protec...
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