Evaluation of some bread wheat genotypes for low nitrogen fertilization using different stress tolerance indices | ||||
| Egyptian Journal of Agronomy | ||||
| Volume 47, Issue 3, September 2025, Page 381-392 PDF (738.86 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/agro.2025.369974.1651 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Mohamed S. Abd El-Aty  1; Mohamed M. kamara1; Shimaa E. Ibrahim2; Mohamed A. M. Eid3; Mohamed S. Sheteiwy4; Ahmad H. Awad5
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| 1Agronomy department, Faculty of Agriculture, Kafr Elsheikh University. | ||||
| 2Wheat Research Department, Field Crops Research Institute, Agricultural Research Center | ||||
| 3Agronomy Department, Faculty of Agriculture, Fayoum University, Fayoum 63514, Egypt | ||||
| 4Department of Agronomy, Faculty of Agriculture, Mansoura University | ||||
| 5Department of Agronomy, Faculty of Agriculture, Kafrelsheikh University, Egypt | ||||
| Abstract | ||||
| This study was conducted to identify low-N-tolerant wheat genotypes by integrating stress indices (STI, GMP) with GGE-biplot analysis, offering a dual approach for breeding programs. The study was conducted as two field experiments at the experimental farm of El Gemmeiza research station under four rates of nitrogen fertilizer (60, 120, 179 and 239 kg N / ha. ) using split plot designed with three replications. The mean square of genotypes, nitrogen and their interactions showed high significance of all studied traits. Nitrogen stress shortened the heading duration in the 1st season by an average of 14.22% and 13.41 % in the 2nd season and by an average of 8.45% and 7.77% and average of 3.46% and 3.83% under 1st, 2nd and 3rd nitrogen fertilizer rates, respectively, compared with the normal rate (N=75 kg nitrogen) under both conditions, Misr1 and G3 displayed the shortest plants, while Sakha 95 and G1 genotypes exhibited the earliest heading and maturity dates. Under both circumstances, Misr 2 was the best genotype overall in terms of the number of kernels per spike, 1000-kernel weight, and grain yield ton/ha . According to the GGE-biplot, Misr 3, G5, G6, and Giza 171 were the most stable cultivars across all eight environments. The correlation coefficients between grain yield under normal and low nitrogen conditions and stress tolerance indices show that the optimum yield indices in low and normal nitrogen circumstances can include the stress tolerance index (STI), mean productivity (MP), geometric mean productivity (GMP), and harmonic mean (HM). | ||||
| Keywords | ||||
| Wheat; grain yield; low N; stress tolerance indices and GGE-biplot modelling | ||||
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