Abstract
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.
