Yield stability of some promising maize (Zea mays L.) hybrids under varying locations [electronic resource].

By: Contributor(s): Language: English Summary language: Arabic Description: p.99-109Other title:
  • الثبات المحصولى لبعض هجن الذرة الشامية المبشرة تحت مواقع مختلفة [Added title page title]
Uniform titles:
  • Journal of agricultural research Kafrelsheikh Univeristy, 2011 v. 37 (1) [electronic resource].
Subject(s):
Online resources: In: Journal of Agricultural Research Kafrelsheikh Univeristy 2011.v.37(1)Summary: Grain yield stability for the new maize hybrids is an important target in breeding programs. The main objective of this study was to identify the stable superior hybrids for grain yield under varying locations. Five promising white single crosses, i.e. Gz 505, Sk 101, Sk 103, Sk 105 and Sk 106 as well as four yellow three way crosses, i.e. Gz 51, Sd 47, Sd 49 and Sd 52 in addition to three cheek hybrids, i.e. SC 10, SC 129 and TWC 352 were evaluated in on-farm trials at eleven locations across Egypt in 2009 growing season. Highly significant differences among hybrids for grain yield were detected at each location and in the combined analysis across locationsVariances due to locations and hybrids x locations interaction were highly significant for grain yield. Linear and non linear components were highly significant. Behera location had the highest environmental index and therefore it was considered as the most favorable environment for realizing the genotypes grain yield potential, while Minia was considered the poorest grain yielding location The promising single crosses, i.e. Gz 505, Sk101, Sk 105 and Sk 106 did not significantly differ from SC10 and SC 129 for grain yield, while SC 103 was significantly higher than SC 10 and insignificantly higher than SC129 for grain yield Also, TWC Sd 47, TWC Sd 49 and TWC Sd 52 did not significantly differ from the check TWC 352, while TWC Gz 51 was significantly higher than TWC 352 for grain yield. These nine new hybrids, according to maize hybrid registration rules in Egypt, might be recommended for release as new commercial hybrids. However, this study prefer SC Sk 101, SC Sk 105 and SC Sk 106 to be released as new commercial single crosses, due to their high stability for grain yield under varying locations.
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Grain yield stability for the new maize hybrids is an important target in breeding programs. The main objective of this study was to identify the stable superior hybrids for grain yield under varying locations. Five promising white single crosses, i.e. Gz 505, Sk 101, Sk 103, Sk 105 and Sk 106 as well as four yellow three way crosses, i.e. Gz 51, Sd 47, Sd 49 and Sd 52 in addition to three cheek hybrids, i.e. SC 10, SC 129 and TWC 352 were evaluated in on-farm trials at eleven locations across Egypt in 2009 growing season. Highly significant differences among hybrids for grain yield were detected at each location and in the combined analysis across locationsVariances due to locations and hybrids x locations interaction were highly significant for grain yield. Linear and non linear components were highly significant. Behera location had the highest environmental index and therefore it was considered as the most favorable environment for realizing the genotypes grain yield potential, while Minia was considered the poorest grain yielding location The promising single crosses, i.e. Gz 505, Sk101, Sk 105 and Sk 106 did not significantly differ from SC10 and SC 129 for grain yield, while SC 103 was significantly higher than SC 10 and insignificantly higher than SC129 for grain yield Also, TWC Sd 47, TWC Sd 49 and TWC Sd 52 did not significantly differ from the check TWC 352, while TWC Gz 51 was significantly higher than TWC 352 for grain yield. These nine new hybrids, according to maize hybrid registration rules in Egypt, might be recommended for release as new commercial hybrids. However, this study prefer SC Sk 101, SC Sk 105 and SC Sk 106 to be released as new commercial single crosses, due to their high stability for grain yield under varying locations.

Summary in Arabic.

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