DESIGN IMPROVEMENT USING UNIFORMITY TRIALS EXPERIMENTAL DATA

The design of field trials sometimes raises queries about alternative designs and the best ways that allowing for environmental variation in the area allotted to the experiment. In field trials, variation in soil fertility can result in substantial heterogeneity within blocks and thus, poor precision in treatment estimates resulted. In this study different complete and incomplete block designs (generalize lattice design) were superimposed with dummy treatment structure on uniformity trials data, so that efficient designing can be made. For all three sites under study, generalize lattice design was on the average more efficient than complete block analysis in reducing the error mean square. Maximum average efficiencies obtained were 2.23 at NARC, 3.64 at BARI and 2.33 at AARI.