CHAPTER 6: ANALYSES OF GRAIN YIELD STABILITY OF SOUTHERN
6.5 Conclusion
The objective of this study was to: (a) evaluate the level of yield stability; and (b) determine the relationship between yield stability and grain yield potential in a representative sample of Southern African maize base germplasm. Results showed that 85% of the 80 hybrids had average stability across the 10 environments. Eight percent displayed below average stability and were specifically adapted to high yielding environments. The hybrids CML395/A26, B17/CML312, B24/B16, B21/CML444 and CML312/A7 with high yield potential would be recommended for release in high yielding environments. Six percent exhibited above average stability and were specifically adapted to drought stress environments. The hybrids B20/CML488, B11/B24, A13/B21, B22/B18, CML312/A9 and ZS255, would be recommended for deployment only in low yielding environments to which they were specifically adapted. Parametric models showed a highly significant and positive relationship between yield stability and yield potential, while nonparametric models showed no significant relationship between yield potential and yield stability. In addition, the study identified some hybrids that displayed both high yield potential and high yield stability (B16/CML312, B19/CML395 and B18/CML442). The hybrid B16/CML312, which displayed high yield potential and high yield stability would be recommended for release in all environments. It can be concluded that high yield potential and high yield stability were not mutually exclusive in this set of germplasm, indicating that hybrids, which combine high, yield potential and high yield stability would be obtainable.
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