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A água do solo e os ombreamento dos cafezais na América Central

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dc.contributor.author Franco, Coaraci M.
dc.date.accessioned 2019-01-21T11:22:27Z
dc.date.available 2019-01-21T11:22:27Z
dc.date.issued 1951-04
dc.identifier.citation FRANCO, C. M. A água do solo e os ombreamento dos cafezais na América Central. Bragantia, Campinas, v. 11, n. 4-6, p. 99-119, abr./jun.1951. pt_BR
dc.identifier.issn 1678-4499
dc.identifier.uri http://dx.doi.org/10.1590/S0006-87051951000200002 pt_BR
dc.identifier.uri http://www.sbicafe.ufv.br/handle/123456789/11007
dc.description.abstract The coffee plant does not thrive well under shade in most of the coffee areas of the State of São Paulo, Brazil. It has been shown that water competition from the shade trees during the dry season is the factor responsible for the failure in growing coffee under shade in São Paulo. In all cases where the coffee plants were not thriving well under shade, the soil moisture after two to three months of drought was at the wilting point at the depths most utilised by the root systems of shade trees and coffee plants. In open plantations this was never observed. All commercial coffee plantations of Central America are shaded. Most of them are located in areas with a dry season as long as in São Paulo and some times even longer. A comparative study of the climatological factors, methods of cultivation and most common species of shade trees was made. No one of these factors explained the different behavior of the coffee plant under shade in Central America and in São Paulo. The available soil water was measured in many coffee plantations in Costa Rica and El Salvador after four months without apreeiable rainfall. In all cases it was' found that, the actual moisture percentage was considerably higher than the wilting point. The amount of available water held by soils in São Paulo and Central America does not seem to be significantly different, although this was not carefully determined. It is suggested that a comparative study of the moisture-tension curves of soils of São Paulo and Central America might explain the different behavior of the coffee plant with shade under these two different conditions. It is possible that, as a consequence of a much steeper moisture-tension curve, the plants in São Paulo soils transpire freely until the soil moisture reaches the wilting point. This would result in a rapid soil water consumption. If the Central American soils have a smoother moisture-tension curve, the Avater absorption and transpiration rate by plants may be slower and as a consequence the available water may last longer in the soil. The ratio of the moisture equivalent to the wilting point was found to be around 1.29 for the soils studied in the Meseta Central of Costa Rica, around 1.44 for those in El Salvador and 1.94 for the ashy soils in the vicinity of San Salvador volcano. pt_BR
dc.format pdf pt_BR
dc.language.iso pt_BR pt_BR
dc.publisher Instituto Agronômico (IAC) pt_BR
dc.relation.ispartofseries Bragantia;v. 11, n. 4-6, p. 99-119,1951;
dc.rights Open Access pt_BR
dc.subject.classification Cafeicultura::Agroclimatologia e fisiologia pt_BR
dc.title A água do solo e os ombreamento dos cafezais na América Central pt_BR
dc.type Artigo pt_BR

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