Stability and reliability of the new corn hybrids in comparison to the regional control HB-83, 1998-2000.
study was conducted to estimate the stability (AMMI) and the
confidence or normalized response (RNI) for a white corn
hybrid, assessed in a regional PCCMCA corn trial from 1998 to
2000. In this period, 100 genotypes were evaluated at 48
environments at nine Central America and the Caribbean
countries. The RN1 values represents the specific genotype.s
probability increase over the mean yield, specified by a control.
The study allowed to identify genotypes with low environment
interaction and of normalized response varying from good to
average (0.6 ≥ RNI < 0.9) according with the control. The
stability and the confidence degree, regarding to the regional
control HB-83, was determined every year. In addition, the
same analysis was performed with 12 genotypes in common at
least in two year of this phase. The combined analysis indicated
that 25% of genotypes showed a RNI = 0.8, these genotypes
were CM 933-133, XM 7706 and XM 7708. Six of them (50%)
showed standard RNI, outstanding the H-59 and CB-HS-9 with
RNI values of 0.73 and 0.75, respectively; the other 25%
presented low RNI, less than 0.6. The HB-83, CB-HS-11, HN-
12 and Trop E 103 were identified as hybrids with low
genotype-environment interaction by the AMMI analysis. Both
analysis allowed to verify that HB-83 is still a competitive and
current regional control due to its high production and good
stability throughout contrasting environments.
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