Mohsen Farshadfar; Ali Ashraf Jafari; Iraj Rezaie; Ezzat allah Farshadfar; Farzad Moradi; Hooshmand Safari
Volume 20, Issue 1 , June 2013, , Pages 182-198
Abstract
Drought resistance of forage yield for 36 accessions of Festuca arundinacea were examined in randomized complete block design with three replications in both irrigated and rainfed environments. Significant variation (P<0.01) for forage dry matter yield was observed between the environments and genotypes. ...
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Drought resistance of forage yield for 36 accessions of Festuca arundinacea were examined in randomized complete block design with three replications in both irrigated and rainfed environments. Significant variation (P<0.01) for forage dry matter yield was observed between the environments and genotypes. The results of mean comparisons showed that accessions 6 (Isfehan), 7 (Isfehan), 15 (Tavankesh), 25 (Australia), 26 (America) and 31 (Australia) had higher values for forage dry matter yield, in both environment conditions. 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), harmonic mean (MH) and geometrical mean of productivity (GMP). Variance analysis of drought resistance indices showed that accessions had significant variation (P<0.01). The first and second components from principal component analysis were accounted for 61.5 and 37.7 percent of variation among accessions for drought resistance indices, respectively. The indices of MP, DTI, MH and GMP as well as forage dry matter yield of stress and non-stress environments had the greatest share in first component. Also, these indices showed significant and positive correlation with forage dry matter yield of stress and non-stress environments, and based on these indices, the accession 6 (Esfahan), 7 (Esfahan), 31 (Australia) and 26 (America), showed the most resistance to drought stress. Our results were confirmed by cluster analysis.
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.