The rankings of lines in the PRYT and in one or two replications at one location were compared with their rankings for seed yield in the other environments.
Phenotypic correlation coefficients were calculated between the PRYT and the mean of the 1996 tests at individual locations and the mean of all locations by PROC CORR of the SAS software package (SAS Institute, 1992).
For selection in the PRYT, the average percentage of lines selected for seed yield was 37% by the family and 49% by the line method.
Even though fewer lines were chosen by the family method, the acceptance error was similar to the line method in the PRYT and in the 1996 tests.
The mean percentage of lines incorrectly rejected in the PRYT was 57% by the family and 41% by the line method.
The results indicated no advantage in maintaining family structure for selection of seed yield in either the PRYT or the individual replications in 1996.
In this study, cultivar Resnik was grown as a common border row between PRYT in each of the 3 yr.
The interpretation of the data that would most closely resemble a cultivar development program would focus on using the 1996 PRYT data for comparison to the 1997 and 1998 advanced yield tests.
To determine the relative stability of the PRYT entries across environments, simple correlation analysis was completed from 1996 to 1998 for all single row PRYT (n = 488).
Simple correlation (r) analysis for yield and yield rank of plant row yield trials (PRYT) from 1996, 1997, and 1998.
Correlations between the selected single row 1996 PRYT and advanced yield testing were variable, dependant upon the population.
Simple correlations (r) for yield and yield rank between selected 1996 plant row yield trials (PRYT) and multiple environment advanced tests.