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Acidity Factors Limiting Nodulation, Nitrogen Fixation and Growth of PHaseolus Vulgaris L.
Bean (Phaseolus vulgaris L.) is extensively grown in tropical regions, mostly in developing countries without use of N-fertilizer. However, root nodulation and N2-fixation has been found variable under acidic conditions, when soil is used as growth medium. Conditions and techniques for achieving good nodulation of bean in continuous aerated solution culture were developed. The effects of pH on uptake and distribution of Mo in bean were studied in greenhouse and growth chamber experiments in soil and solution culture. The effects of pH and Al on nodule initiation and growth, nitrogen fixation (C2H2-reduction) and shoot and root growth were studied in solution and san culture. Growth and nitro...
Mixed Plantations of Eucalyptus and Leguminous Trees
The aim of this book is to present, in depth, updated information on soil and microbial processes involved in mixed plantations of Eucalyptus and N2-fixing species, especially Acacia mangium, focusing on Forestry, Soils, Biology, Ecosystem Services and Sustainability. The potential of substituting chemical N fertilizer by a consortium of leguminous species that fix atmospheric nitrogen is an interesting solution for a more sustainable, economically and environmentally sound forest system. Among the main topics, we present reference topics on soil microbiology, as biological nitrogen fixation, the role of mycorrhiza in mixed plantations, bio-indicators of soil quality, and plantgrowth promoting bacteria with biotechnological potential. Here we discuss Ecosystem services and ecological benefits of these systems, the invasive potential of A.mangium, as well as the regulations and perspectives of land use policies for mixed forests and their role in the sustainability of the system.
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Agroambientes de transição
Agroambientes de transição avaliados numa perspectiva da agricultura familiar; a vegetação da região de transição entre a Amazônia e o Nordeste, diversidade e estrutura; o cutivo em aléias como alternativa para a produção de alimentos na agricultura familiar no trópico úmido; leguminosas arbóreas como agentes de recuperação de áreas degradadas; atributos e especificidades de solos de baixada no trópico úmido; meliponicultura: uma atividade essencial para a economia familiar do trópico úmido; manejo integrado de pragas; fruteiras nativas - ocorrência e potencial de utilização na agricultura familiar do Maranhão.
