Abstract:
Really, the traditional designs and classical analysis of variance (ANOVA) may be not
adequately to evaluate or screen large number of genotypes and reduce the heterogeneity effect
of the new soil. To minimize standard error of differences (SED) between means for catching
significance, data were analyzed using various designs and analyses models. This study was
purposed to compare traditional randomized complete blocks design (RCBD) and alpha lattice
design (ALD) by assessing relative efficiency, using two models of analyses, ANOVA as
traditional model and restricted maximum likelihood (REML) as non-traditional one. The field
trials were conducted during seasons 2017 to 2019 at Marashda Research Station (new soil),
Kena, Egypt. A collection of twenty-five groundnut genotypes were grown in an alpha lattice
design with three replications. Results elucidated that the studied genotypes differed significantly
for all yield-traits. Relative efficiency of using designs of ALD over RCBD increased
experimental accuracy by 72.77- 46.23% and 21.92-14.78% for pod weight plant-1
and pod yield
fed-1
in both seasons, respectively. Therefore, the results confirmed that the RCBD should be
replaced by ALD experiments in testing large number of treatments. Relative precision of using
REML analysis over ANOVA increased accuracy by 31.32- 15.88 % and 8.54-1.76 % pod
weight plant-1
and pod yield fed-1
in both seasons, respectively. Generally, REML analysis was
more precise and effective in reducing the SED compared to ANOVA for individual and
combined analysis. The rank of genotypes mean across the different analyses and seasons were
not constant. Then, REML analysis increased the efficiency of genotype selection for further
evaluation, providing unbiased estimates. The genotypes that score rank over the studied checks
(Giza 6, Ismailia-2, Suhag 104, Suhag 107 and Suhag 110) that are considered the best elite group, included Line-25A and Line-110 genotypes with highest pod yield, followed by Line32A, Line-2B, Line-19A, Intro.-335 and Intro.-504. Therefore, this collection which is the best
promising elite group should be effective and satisfactory for successful breeding purposes under
Marashda new soil. |
