This investigation was carried out during 2003/2004, 2004/2005 and 2005/2006 seasons at seventeen field experiments. The experiments were performed at Al-Gemmeiza, Moshtohor, Toska and Giza in 2003/2004, 2004/2005 and 2006, Shandweel, Zarzoura and in 2004/2005 and 2005/2006 and Nubaria in 2005/2006 at Agriculture research stations, Agriculture research center fields. These sites represent North, South, Middle Delta, Upper Egypt and New valley to evaluate twenty four genotypes, environments and their interaction on number of spikes/m2, 1000-kernel weight and grain yield (ardab/fed.). In addition to estimation of phenotypic and genotypic stability parameters according to Eberhart and Russell (1966) and Tai (1971), respectively. The studied traits were number of spikes/m2, 1000-kernel weight and grain yield (ardab/fed.). The design used was a Randomized Complete Block .The obtained results may be summarized:
1- Environments were highly significant for number of spikes/m2, 1000 kernel weight and grain yield (ardab/fed.). E1 (Gemmeiza 2003/2004) environment was superior to the other locations regarding number of spikes/m2, while the 1000 kernel weight which recorded the highest mean value in E14 (Moshtohor2005/2006). For grain yield (ardab/fed.), the environments number 11 (Shandweel 2004/2005) and 16 (Shandweel 2005/2006) recorded the highest values followed by environments number 8 (Moshtohor 2004/2005) and 13 (Gemmeiza 2005/2006).
2- Number of spikes/m2, 1000-kernel weight and grain yield (ardab/fed.) were significantly affected by genotypes. Based on the over all means genotypes number 2 (Gem.7) and 6 (Gem.5) gave the highest significant values for number of spikes/m2, 1000-kernel weight and grain yield (ardab/fed.) compared to the other genotypes while genotype 17 (L15) gave the lowest significant number of spikes/m2, 1000-kernel weight and grain yield (ardab/fed.).
3- Significant interaction between genotypes and environments were detected for number of spikes/m2, 1000-kernel weight and grain yield (ardab/fed.).
* Feddan = 4200 m2
4- For grain yield (ardab/fed.), the genotypes number 2 (Gem.7), 6 (Gem.5), 7(L5), 8 (L6), 9 (L7), 10 (L8), 15 (L13), 22 (G.168) and 23 (Gem.9) were the phenotypically stable where they gave the highest mean values than grand mean b = 1 and S2di equal zero. The genotypes number 2 (Gem.7), 13 (L11), 21 (L19), 18 (L16), 6 (Gem.5), 17(L15) and 23 (Gem.9) were genetically stable for grain yield under the environments.
|
