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Models for estimating yacon leaf area Horticultura Brasileira
Erlacher,Wellington A; Oliveira,Fábio L; Fialho,Gustavo S; Silva,Diego MN; Carvalho,Arnaldo HO.
ABSTRACT The recent exploration of yacon demands scientific information for improving the crop production technology. This study aimed to set a leaf area estimate model for yacon plants, using non-destructive measurements of leaf length (L) and/or width (W). Sixty-four representative yacon plants were randomly selected in an experimental field during the full vegetative growth. One thousand leaves of various sizes were taken from those plants for setting and validating a model. The logarithmic model best fitted this purpose, the result of multiplying length by width being used as independent variable. Yacon leaf area can be determined with high precision and accuracy by LALW = (-27.7418 + (3.9812LW / ln LW ) , disregarding the leaf size.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Smallanthus sonchifolius; Leaf size; Mathematical modeling..
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362016000300422
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Physical and chemical characterization of yacon tuberous roots at different altitudes and planting times Horticultura Brasileira
Silva,Diego MN; Lima,Raquel R; Oliveira,Fábio L; Teixeira,Luciano JQ; Machado,Leonard CA.
ABSTRACT The post-harvest quality of yacon tuberous roots produced at different altitudes and planting times were characterized in this study. The experiment was conducted in the South of Espírito Santo State in two locations, one at 837 m altitude and the other one at 113 m altitude. The experimental design, in each place, was randomized blocks with four replications, and the treatments consisted of three planting seasons: April (autumn), July (winter) and September (spring). After harvest of the tuberous roots, we evaluated pH, titratable total acidity, moisture content, soluble solids, reducing sugars, crude fiber and ash, as well as color, hardness (maximum force recorded in the first penetration or compression cycle) and chewiness index (energy...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Smallanthus sonchifolius; Post-harvest quality; Instrumental coloration; Sensorial traits.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362018000200199
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Occurrence of insects causing injuries to the yacon crop Horticultura Brasileira
Silva,Diego MN; Oliveira,Fábio L; Dalvi,Leandro P; Pratissoli,Dirceu; Erlacher,Wellington A; Quaresma,Mateus AL.
This research aimed to catalog insects that cause injury to the yacon (Smallanthus sonchifolius, família Asteraceae) crop, in order to identify those who may cause damage. The study was carried out in Alegre, Espírito Santo State, Brazil. Cultivation began in May 2013 and the harvest was done 180 days later. Three species from the Coleoptera order: Lagria villosa (Coleoptera: Lagriidae); Cerotoma arcuata and Diabrotica speciosa (Coleoptera: Chrysomelidae) and two species from the Lepidoptera order: Spodoptera eridania (Lepidoptera: Noctuidae) and Chlosyne lacinia saundersii (Lepidoptera: Nymphalidae) were observed causing damage to the yacon crop. The caterpillar C. lacinia saundersii, known as sunflower caterpillar, was the most important species, being...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Smallanthus sonchifolius; Damage; Pest management.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362015000300394
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