Stability parameters of yield and yield components in maize hybrids (Zea mays L.)
2000
Djurovic, D.
Eleven maize hybrids of FAO maturity group 300-700 were estimated in two separately performed experiments (50 and 65000 plants/ha) on three agroecologically different locations. The following quantitative traits were analyzed: grain yield with 14% moisture, moisture content at harvest (%), 1000 grain mass, ear length, grain row number per ear, plant height and ear height. The presence of genotype-environment interaction was established for all the traits studied except for the number of grain rows. In respect of bsub(i) for grain yield, except in one case, no significant differences between hybrids existed regarding the mean value, whereas in respect of the other traits the above i.e. the below average stable hybrids could be identified in relation to the remaining ones. With higher values of the traits studied, the hybrids of the higher maturity groups are mainly characterized with unfavourable values of stability parameters, i.e. specific response and better adaptation to more favourable environmental conditions, compared to those of shorter vegetation. Inconsistency of the value of regression coefficient per years for the studied traits resulted from the non-representativeness of the years being chosen and from disadvantages of regression analysis, whereas that per densities for some traits pointed to the possibility that different densities in the same location and year may be considered as different environments.
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