Sampling Strategies for Estimates of Cluster Weight, Soluble Solids and Acidity of ‘Concord’ Grapes1

Abstract

Abstract Variability of cluster weight, soluble solids, and titratable acidity of ‘Concord’ grapes ( Vitis labruscana Bailey) was quantified with respect to several fixed and random factors. All 3 measurements were affected by cluster position while only cluster weight and soluble solids were affected by sunlight exposure. Estimates of variance components indicated that the greatest percentage variability was among vines. Variance components were used to examine efficient sampling plans that would detect a specified difference at a selected level of Type I error. Graphs illustrate various schemes of sample allocation which would achieve the desired level of precision.