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Comparison of Planting Arrangements and Time of Evaluation for Peas (Pisum sativum L.)¹

Eight cultivars of processing peas (Pisum sativum L.) were grown under both nursery and commercial conditions during 1965 and 1966. They were evaluated for yield and other characters at the normal green pea processing stage and at the mature plant dry seed stage. The relationship between values measured under the two different planting arrangements and at the two tunes of harvest were examined through simple correlation coefficients and analyses of variance. Values obtained under nursery conditions for plant height, total number of nodes, lowest pod node, and number of ovule initials per pod were highly correlated with values obtained under commercial growing conditions. Large and highly significant "r" values were likewise obtained for these same traits when the comparison was between the normal processing stage and the dry seed stage. Yield per plot, pods per plant, and peas per pod were not consistently correlated between planting arrangements nor between tunes of harvest. Significant variety x planting arrangement and variety x harvest interactions indicate that some cultivars differed markedly for some characters from the general similarities of performance. Too much reliance upon evaluations made under nursery conditions, or at the mature plant stage, would results in misclassification of these cultivars relative to their performance under normal processing renditions.

Key Words: Correlation • Slection • Cultivar evaluation

² Assistant Professor of Agronomy, Wisconsin Agr. Exp. Sta.

Received for publication March 19, 1969.