Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 5
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Abiotic alterations caused by forest fragmentation affect tree regeneration: a shade and drought tolerance gradient in the remnants of Coastal Maulino Forest RChHN
GUERRERO,PABLO C; BUSTAMANTE,RAMIRO O.
Plant regeneration is strongly determined by light and soil moisture differences between habitáis; both variables are modified by large-scale forest fragmentation. Several studies have indicated this alteration as the mechanism involved in tropical forest community change. The effects of fragmentation may be much more severe in Mediterranean and deciduous forests, because plant species in these forests show a stress tolerance tradeoff between shade and drought. Our study was performed in the deciduous fragmented Coastal Maulino Forest: Reserva Nacional Los Queules (RNLQ) and surrounding small fragments. We hypothesised that Aristotelia chilensis (shade intolerant but drought tolerant) should increase its regeneration in small patches as a consequence of...
Tipo: Journal article Palavras-chave: Ecological restoration; Forest fragmentation; Safe sites; Seed germination; Seedling establishment.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000300008
Imagem não selecionada

Imprime registro no formato completo
An ecophysiographic approach for Araucaria araucana regeneration management Ciencia e Investigación Agraria
Drake,Fernando; Molina,Juan Ramón; Herrera,Miguel Ángel.
Chilean temperate forests are dominated by Nothofagus and Araucaria araucana species. Despite A. araucana not being at imminent risk of extinction, its cultural value and the associated environmental services and landscape goods have an important role for the conservation of this native forest. In some areas, the future conservation of A. araucana is a cause of great concern given its management prohibition and regeneration limitation due to slow growth, canopy tree competition and dense understory. The above characteristics make this species most susceptible to some disturbances, such as livestock, wildlife and human pressures. Therefore, sustainable management of A. araucana forests requires the assessment of its regeneration condition. The objective of...
Tipo: Journal article Palavras-chave: Maxent model; Nothofagus species; Seedling establishment; Seedling tree.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100013
Imagem não selecionada

Imprime registro no formato completo
Design and performance evaluation of PHilMech multi-row onion seeder: Ten-row model CIGR Journal
Dela Cruz, Renita Sta. Maria; Idago, Rodelio G.
       There are several inefficiencies in the present direct seeding method of onion that are being practiced in the Philippines.  This study aimed to address these inefficiencies by developing and evaluating a tractor-hitched mechanical seeder that could efficiently distribute and plant onion seeds and reduce production cost.           Machine development was done from 2013-2016 and laboratory and extensive field evaluations in farmers’ farms were carried out in 2016-2017.  A 10-row, tractor-hitched and drill type onion seeder was developed which is capable of opening furrows, metering and delivering the seeds to the furrows, covering the seeds and firming the seedbed.  The machine was evaluated in terms of its technical performance following the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Farm machinery bulb onion; Seedling establishment; Onion seeder; Field performance; Direct seeding.
Ano: 2019 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5427
Imagem não selecionada

Imprime registro no formato completo
Dinamica de las plantulas de Sorghum halepense (L.) Pers. en el cultivo de trigo. I. Influencia de la densidad de siembra. Repositório Alice
TUESCA, D.; PURICELLI, E.; VITTA, J.I..
Los objetivos de este trabajo fueron analizar la influencia del cultivo de trigo sobre la dinamica de plantulas de sorgo de Alepo y determinar su contribucion al banco de propagulos. Los ensayos se realizaron en 1988, 1990 y 1992 en Zavalla (Santa Fe), Argentina. En parcelas con distintas densidades de trigo se sembraron semillas de la maleza. Se cuantifico la emergencia y a la consecha del cultivo se determino el peso de los individuos sobrevivientes. En todos los anos se observo correlacion entre el grado de germinacion de la maleza y las alternancias diarias de temperaturas. El establecimiento comenzo a fines de septiembre-principios de octubre. La dinamica y el numero total de semillas germinadas no guardo relacion con las precipitaciones. Sin embargo...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Estabelecimiento de plantulas; Triticum aestivum; Seedling establishment.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/104192
Imagem não selecionada

Imprime registro no formato completo
Growth and early seedling survival of four Atacama Desert shrub species under experimental light and water availability regimes RChHN
Carvajal,Danny E; Loayza,Andrea P; López,Ramiro P; Toro,Pablo J; Squeo,Francisco A.
BACKGROUND: In arid environments, where light and water supply are patchy in space and time, differences in how seedlings tolerate drought and shade conditions will determine the ability of a species to establish. Understanding seedling responses to the interactive effects of water and shade is critical to predict the future impact of increasing drought frequencies on plant communities across many arid ecosystems of the world. In this study, we used an experimental field approach to assess how different light (15%, 75%, and 95%) and water (natural rainfall (NR), NR +50 mm, NR +100 mm) levels affect seedling survival and growth of four Atacama Desert shrub species (Calliandra chilensis, Encella canescens, Proustia cuneifolia, and Senna cumingii). We...
Tipo: Journal article Palavras-chave: Seedling establishment; Facilitation; Drought; Atacama Desert.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2014000100025
Registros recuperados: 5
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional