STUDIES ON STABILITY OF SUGAR BEET GENOTYPES UNDER OLD AND NEW RECLAIMED LANDS

Abstract

The stability measures are useful in characterizing genotypes by showing their relative
performance in various environments. Ten sugar beet genotypes were evaluated across
eight different environments in old lands and four environments in new land reclaimed
with two sowing dates and two locations. Two years to study their yield potential and
stability. Four statistical parameters (Wricke’s Ecovalence, Shukla’s (two measures),
kang and Coefficient of variation) were used for determining yield and other traits
stability of the genotypes. Highly significant differences due to genotypes (G) in old
land and all environments for all studied traits except sucrose % in combined data
were found. Environments (E) and GxE interaction had the same trend in all lands and
combined data except sucrose % in old land, which is suggesting differential responses
of the genotypes. Results showed that the statistics parameters were differed in their
efficiency for determining the true stable genotypes. But all proposed parameters were
in line for determining stability of G4 in old land for root yield and sucrose yield and
over all the environments with considering mean yield, so it could be recommended
for growing under conditions of old land and G6 for root yield and G3 for sugar yield
in new reclaimed land. Concerning sucrose (%), the genotype G9 in old land and the
genotypes (G4, G5, G6, G9 and G10) concerning yields in new reclaimed land were
recorded by all proposed parameters (C.V., 2i, S2i, Eco. and Ysi) for stability. So they
could be recommended for growing under these conditions. The relative small value
for the heritability in all traits studied means that the large effect by environmental on
the studied traits.