Mohammad Phayaz; Hasan Yeganeh; Houshmand Safari; Hamzeh Ali Shirmardi; Rasoul Mirakhorli; Seyed Hamid Habibian; parvaneh Ashouri Sanjabi
Volume 20, Issue 4 , March 2014, , Pages 686-694
Mohammadreza Shooshtari; Hooshmand Safari; Mohammad Fayyaz; Morteza Akbarzadeh; Saeedeh Nateghi
Volume 20, Issue 3 , November 2013, , Pages 570-583
Hooshmand Safari; Ali Ashraf Jafari
Volume 19, Issue 4 , March 2013, , Pages 640-654
Abstract
Drought resistance of 24 accessions of Agropyron trichophorum was examined based on forage yield in a complete block design with three replications under normal and dry land farming system. Drought resistance indices of genotypes were measured for forage dry matter yield of two environment conditions ...
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Drought resistance of 24 accessions of Agropyron trichophorum was examined based on forage yield in a complete block design with three replications under normal and dry land farming system. Drought resistance indices of genotypes were measured for forage dry matter yield of two environment conditions including sensitivity to stress index (SSI), tolerance (TOL), mean productivity (MP), drought tolerant index (DTI), mean harmonic (MH) and geometrical mean of productivity (GMP). According to the results of variance analysis of drought resistance indices, significant variation was observed among accessions. Results of mean comparisons showed that genotypes 10 (Semirom), 23 (Mazandaran), 24 (Gorgan), 5 (Chaharmahal), 17 (Yasuj) and 9 (Eghlid) had higher values for forage dry matter yield in both environment conditions. With regard to the drought resistance indices, genotypes 10 (Semirom), 23 (Mazandaran) and 24 (Gorgan), showed the most resistance to drought stress. Obtained results were confirmed by results of cluster analysis and principle component analysis.
Saeid Rashvand; Hoshmand Safari; Parvaneh Ashouri sanjabi
Volume 19, Issue 2 , September 2012, , Pages 355-369
Abstract
In this study, sustainability of forage production in some rangeland species of mountainous rangelands of Alamut Qazvin was investigated. These mountainous rangelands are located in the highlands of North-Eastern city of Qazvin as a part of south basin of central Alborz Mountains. The rainfall of these ...
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In this study, sustainability of forage production in some rangeland species of mountainous rangelands of Alamut Qazvin was investigated. These mountainous rangelands are located in the highlands of North-Eastern city of Qazvin as a part of south basin of central Alborz Mountains. The rainfall of these natural environments is 400 mm per year. Long dry season is considered as the main characteristics of the natural environments of these ecosystems. Production per hectare of 24 species was studied during four years. Combined analysis of variance for dry forage production (kg/ha) showed significant differences (p>0.01) among species and the years. According to the results of mean comparisons (Duncan’s multiple test) and cluster analysis (Ward method), Eryngium billardieri, Cousinia esfandiari, Artemisia aucheri, Verbascum speciosum, Agropyron intermedium, and Cirsium haussknechtii had higher forage production. Interaction effect of species * year was significant at 1% probability level and sustainability parameters were calculated based upon average forage production. Parameters of CVi, S2di and R2 had similar trends in introduction of sustainable species and most of them showed low forage production based upon these parameters. Parameters of Bi, W2i and S2i also showed the same trend in expression of sustainability and on the basis of these three parameters, an average forage production was recorded for most of sustainable species. In general, Cousinia esfandiari and Artemisia aucheri showed appropriate production sustainability based upon most sustainability parameters. Agropyron intermedium and Cirsium haussknechtii were not sensitive to adverse conditions while Verbascum speciosum and Eryngium billardieri were sensitive to adverse conditions. Therefore, Agropyron intermedium and Artemisia aucheri could be introduced for range improvement programs.
Sadegh Esfandiary; Ali morad Hasanli; Hooshmand Safari; Mohsen Farshad far
Volume 15, Issue 2 , January 2008, , Pages 283-294
Abstract
In this research, the effect of deficit irrigation on some characteristics of five species of medics: physiological properties, yields, plant quality, and resistance to drought in the Islamabad region were investigated. Five different irrigation amounts (0, 25, 50, 75 and 100%) and five species of medics ...
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In this research, the effect of deficit irrigation on some characteristics of five species of medics: physiological properties, yields, plant quality, and resistance to drought in the Islamabad region were investigated. Five different irrigation amounts (0, 25, 50, 75 and 100%) and five species of medics with three replications in a split plot design experiment were considered. The irrigation requirements using Penman-Montith with CROPWAT software on the basis of climatic data of study region with irrigation efficiency of 90% was estimated. The variance analysis indicated that a significant variation at 1% level for the effect of medic species on all indices was observed. The results of stress intensity index indicated that minima species had the greatest sensitivity to stress. radiata and turbinata species showed the greatest resistance to drought. Although the rigidula species had the greatest yield in all levels of irrigation it were sensitive to drought. Based on drought tolerance index, rigidula species showed the lowest resistance to drought and had the largest water productivity. Based on the calculated indices rigidula species is recommended for irrigation and turbinata species for rainfed. The orbicularis, and radiata species showed the lower production in rainfed condition.