Browsing by Author "Luiz Antonio dos Santos Dias"

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    Cacao Yield in Different Planting Densities
    (2009) Carlos Alberto Spaggiari Souza; Luiz Antonio dos Santos Dias; Marco Antonio Galeas; Sabrina Sonegheti; Jeferson Oliveira; Jorge Luiz Andrade Costa
    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
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    Diversity of cacao fat in germplasm from Rondônia, Brazil
    (2008) Caio Marcio Vasconcellos Cordeiro de Almeida; Valdir Alves Facundo; Henrique Otavio Braga Brazi; Luiz Antonio dos Santos Dias; Jose Raymundo Pires Medeiros; Jorge Luiz Andrade Costa
    Chocolate is food of high nutritional value made from the fat extracted from cacao beans. Fat content and melting point are features of utmost importance for the chocolate, pharmaceutical and cosmetics industries. This paper quantified the cacao germplasm diversity from Rondônia for these two attributes. Expressive diversity was detected among the 102 evaluated clones in April/May 2003 for fat content and melting point. The mean fat content was 55.53% (51.04 to 58.19%) and the mean fat melting point 29.55 ºC (25.60 to 32.53 ºC). The accessions from wild populations in Rondônia were outstanding for both attributes. The two periods (September/October 2001 and April/May 2003) affected the evaluated clones differently. The plot of principal components analysis showed expressive variability and was, to a certain extension, able to separate wild from domesticated accessions