85 research outputs found

    Calibração do teste de tetrazólio em sementes de castanha-do-brasil.

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    bitstream/item/57744/1/CPATU-ComTec17.pd

    Water and nutrient fluxes as indicators for the sustainability of different land-use systems on the terra firme near Manaus - a project overview.

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    Comparision of the water and nutrient fluxes in different perennial land-se systems, either monocultures or mixed cropping systems, in order to determine the resource efficiency of perennial land-se systems. They were comparision of the monocultue systems with Theobroma grandiflorum (cupuacu) or Bactris gasipaes (pupunha), polyculture systems with cupuacu, pupunh, Bixa orellana (urucum) and Bertholletia excelsa (castanha-do-Para) and primary and secondary forest sites. In the first experimental year, the equipment was installed to measure raianfall, throughfall, stemflow and soil water fluxes. These data combined with measurements of nutrient concentrations inform about the element fluxes. for this purpose, laboratory facilities were implemented to analyze anions and cations in the different land-se systems. Additionally, the nutrient and organic matter content of the soils were studied. Firt results showed that the investigated tree species differ in their effect on the water distribution and nutrient accumulation within the different cropping systems

    Water and nutrient fluxes as indicators for the sustainability of different land-use systems on the terra firme near Manaus - a project overview.

    Get PDF
    Comparision of the water and nutrient fluxes in different perennial land-se systems, either monocultures or mixed cropping systems, in order to determine the resource efficiency of perennial land-se systems. They were comparision of the monocultue systems with Theobroma grandiflorum (cupuacu) or Bactris gasipaes (pupunha), polyculture systems with cupuacu, pupunh, Bixa orellana (urucum) and Bertholletia excelsa (castanha-do-Para) and primary and secondary forest sites. In the first experimental year, the equipment was installed to measure raianfall, throughfall, stemflow and soil water fluxes. These data combined with measurements of nutrient concentrations inform about the element fluxes. for this purpose, laboratory facilities were implemented to analyze anions and cations in the different land-se systems. Additionally, the nutrient and organic matter content of the soils were studied. Firt results showed that the investigated tree species differ in their effect on the water distribution and nutrient accumulation within the different cropping systems

    Biologia reprodutiva de castanheira (Bertholletia excelsa Bonpl) em um plantio no Acre.

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    O presente estudo teve como objetivo iniciar um estudo sobre a biologia reprodutiva, e os padrões fenológicos da castanheira em situação de plantio a fim de melhor entender seu comportamento reprodutivo e buscar alternativas para potencializar a produção de frutos

    Escarificação mecânica e embebição na germinação de sementes de castanha-do-brasil.

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    bitstream/item/28826/1/CPATU-BP10.pd

    Sustainable forest use in Brazilian extractive reserves: natural regeneration of Brazil nut in exploited populations.

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    The emergence of Brazilian extractive reserves reinforced the notion that sustainable forest use could play a central role in conservation. Brazil nut is considered a model non-timber product for promoting conservation through use. Demographic studies, however, have demonstrated differential impacts of nut harvest on Brazil nut population structure. Comparing three populations with different forest use histories, degrees of road access, and recent levels of nut harvest, we asked: (1) Are they exhibiting regeneration failure? and (2) Are seedling/sapling densities explained by adult Brazil nut structure, fruit fate and/or overall forest structure? We installed four 9-ha plots in each site to census Brazil nut trees > 10 cm dbh, and within each plot, 36 subplots (25 × 25 m each) to quantify regeneration, overall forest structure, and open and closed fruit counts. Approximately 29-55% of fruits was unharvested, and more than 90% of these was opened by scatterhoarding dispersers. Population structure approximated a reverse-J size class distribution, with seedling densities varying from 3.2 to 5.8 individuals ha-1. We conclude that within the current harvest context, regeneration is sufficient for population persistence in our sites, at least over the medium term. The socioeconomics of sustainably managing Brazil nut is the greater challenge, involving interlinked competitive land uses, nut quality, and substantial increases in local income from harvest. Some of these challenges are being addressed in Brazil, Bolivia and Peru, providing hope that this cornerstone extractive species will continue to play a prominent role in the ecological and economic landscape of Amazonia

    Aspecto econômico de um processo de secagem de amêndoas de castanha do Brasil (Bertholletia excelsa) assistida a microondas

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    O principal problema que ocorre no processamento da castanha do Brasil (Bertholletiaexcelsa Humb. & Bonpl.) ´e durante a secagem da amˆendoa, pois esta etapa n˜ao oferecegarantias de qualidade quando as condi¸c˜oes de armazenamento e transporte dos produtos n˜aoforem adequadas. O objetivo deste trabalho foi avaliar o desempenho de um sistema pilotode secagem assistido a microondas, combinado com aplica¸c˜ao de ar quente, na secagem deamˆendoas de castanha do Brasil, buscando reduzir o tempo de secagem para obter um maiorrendimento industrial, quando comparado com os processos convencionais. Esta presquisatamb´em apresenta a elabora¸c˜ao de um estudo econˆomico preliminar visando `a estimativado custo final de produ¸c˜ao industrial da nova alternativa de secagem aqui proposta comaplica¸c˜ao de microondas

    Atividade de água em amêndoas de castanha do Brasil (Bertholletia excelsa) secas por microndas e convencionalmente

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    O presente trabalho teve como objetivo avaliar os n´ıveis de atividade de ´aguapresentes em am^endoas de castanha do Brasil secas tanto pelo processo de secagem utilizandoenergia de microondas, quanto pelo processo convencional, durante um per´ıodo de seis meses.Os processos de secagem foram desenvolvidos em fornos dom´esticos adaptados com sistemaexterno de provis~ao de ar quente. Testes foram estabelecidos a partir de planejamentosexperimentais, utilizando combina¸c~oes de densidades de pot^encia (W/g), temperaturas evelocidades do ar. As respostas de ambos os processos foram tempo de secagem e atividadede ´agua (AW). Os resultados obtidos dos n´ıveis de atividade de ´agua ao longo dos 180dias de estocagem da am^endoa seca embalada ficaram abaixo de 0,6, ou seja, aW ≤ 0,60.Conclui-se, ent~ao, que as am^endoas permaneceram est´aveis do ponto de vista microbiol´ogicodurante todo o tempo de armazenamento
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