Use of trend analysis in wheat performance experiment.
1991
Khan N. | Kronstad W.E.
This study aimed at comparing efficiency of Papadakis method (PM) and Schwarzbach nearest neighbour analysis (SNNA) with randomized complete block design (RCBD) in accounting for environmental variation. Grain yield data of six wheat performance trials comprising 60-90 varieties were used to compare analytical methods. Intrinsic experimental error was measured using randomized complete design (RCD) analysis. Reduction in coefficient of variation (CV) with PM, SNNA and RCBD compared with CV in RCD (base CV) was measured. Reduction in base CV was 22, 17.5 and 9.5 percent in SNA, PM and RCBD, respectively on an average of six experiments. The results proved that SNNA and PM were more efficient methods than RCBD in determining field variation However, PM and SNNA reduced base CV more than RCBD in all experiments. In one experiment, PM was equal to RCBD while SNNA was inferior to RCBD. Except one experiment, SNNA was superior to PM. In field situation which do not permit effective blocking, SNNA and PM are better than RCBD to remove effect of field variation in wheat trials.
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