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Cacao yield in different planting densities BABT
Souza,Carlos Alberto Spaggiari; Dias,Luiz Antônio dos Santos; Aguilar,Marco Antonio Galeas; Sonegheti,Sabrina; Oliveira,Jéferson; Costa,Jorge Luiz Andrade.
The effect of six planting densities on cacao yield of a commercial hybrid mixture as well as the interaction of planting densities with the years were investigated. Crop data collected over a 14-year period (1977-1990) showed that it was possible to optimise the regional cacao yields by implementing high planting densities (2500 and 1736 trees ha-1). This was however only true for the first half of the crop period. In the second half, low planting density (1059 trees ha-1) attained the best yields. This change in the ranking of planting densities over the years confirmed the presence of density-year interaction. Alternatives to achieve high productivity in high planting density systems were presented and discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Density-year interaction; High productivity; Theobroma cacao L.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600001
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Leaf application of silicon in young cacao plants subjected to water deficit PAB
Zanetti,Leonardo Valandro; Milanez,Camilla Rozindo Dias; Gama,Vinícius Novo; Aguilar,Marco Antonio Galeas; Souza,Carlos Alberto Spaggiari; Campostrini,Eliemar; Ferraz,Tiago Massi; Figueiredo,Fábio Afonso Mazzei Moura de Assis.
Abstract: The objective of this work was to evaluate the physiological and anatomical traits of plants of a cacao (Theobroma cacao) clone in response to water deficit after leaf application of silicon. A randomized complete block design was used, with four replicates, in a 2x3 factorial arrangement of two water regimes (irrigated or nonirrigated) and three silicon concentrations (0.0, 1.5, and 3.0 mg mL-1) applied in wettable SiO2 powder. The plants were evaluated 20 days after the irrigation regimes were applied. The use of SiO2 increased the stability of cell membranes and the photochemical efficiency of the plants under water deficit. The 1.5 mg mL-1 concentration of SiO2 increased photosynthetic rate, water use efficiency, and carboxylation efficiency,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Theobroma cacao; Anatomy; Antioxidant enzymes; Drought; Photochemistry; SiO2.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000300215
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Morphological and physiological adjustments of Brazilwood (Caesalpinia echinata Lam.) to direct solar radiation Braz. J. Plant Physiol.
Mengarda,Liana Hilda Golin; Milanez,Camilla Rozindo Dias; Silva,Diolina Moura; Aguilar,Marco Antonio Galeas; Cuzzuol,Geraldo Rogério Faustini.
This study aimed to characterize the alarm and resistance phases of stress of Caesalpinia echinata under intense irradiance in order to better define its position on forest succession. The alarm phase was identified by rapid reduction in the maximum quantum yield of PSII primary photochemical reactions (ΦP0 = FV/FM) and Performance Index (PIABS) followed by total leaf abscission in the first week of exposure to direct sunlight. The new leaves grown showed recovery of chlorophyll a parameters, increase in blade thickness, elongation of the palisade and spongy parenchymas, higher water content, and reduction of specific leaf area. These changes were associated with the osmoprotector of sucrose and antioxidative of raffinose effects, which indicate an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest succession; Light stress; Photoinhibition; Leaf anatomy; Soluble carbohydrates.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000300003
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