Métodos de amostragem e tamanho de amostra para avaliar o estado de maturação da uva Niágara Rosada / Sampling methods and sample size to evaluate the maturation state of the Ni´agara Rosada grape

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Sao Paulo state is the main table grape producer in Brazil, being the Niágara Rosada (Vitis Labrusca) the predominant cultivar. To offer quality products to the market, the producers need to determine, periodically, the grapes maturation state, being the content of soluble solids the main variable measured. To determine this content, a sample of fruits in an area is collected. This work approaches the random and the stratified sampling methods and the appropriate sample size of individual berry to evaluate the maturation state of the Niágara Rosada based on the content of soluble solids. The appropriate sample size for individual berry was obtained for two sampling methods, separately, using the Maximum Curvature, Modified Maximum Curvature and Variance Curve methods. The sampling methods were compared using a univariate analysis for repeated measures data using the SAS GLM and MIXED procedures. Two different procedures were used to attain reliable results. The minimum berry sample size required for stratified and random methods were approximately 30 and 27 berries by area, respectively. The sampling methods investigated present significantly different results, and the random method presented high maximum and minimum variation by plant and should be avoided for this kind of study.

ASSUNTO(S)

uva. maturação vegetal sample size sampling methods amostragem - métodos content of soluble solids. niagara rosada

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