fahimeh Arab; Ali- Ashraf Jafari; Mohammad- Hassan Assareh; Mohammad Jafari; Ali Tavili
Volume 18, Issue 1 , May 2011, , Pages 17-31
Abstract
Agropyron deserterum andAg. elongatum species have a high value for both fresh and dry forage and because of high production and top acceptance by livestock they have specific value in the beginning of the growth season for livestock grazing. This research was conducted to study the effects of ...
Read More
Agropyron deserterum andAg. elongatum species have a high value for both fresh and dry forage and because of high production and top acceptance by livestock they have specific value in the beginning of the growth season for livestock grazing. This research was conducted to study the effects of salinity stress on the mentioned species in germination and vegetative growth stages. A completely randomized design including five levels of 0, 100, 200, 300 and 400 mM NaCl and CaCl2 with 4 replications was used. Seeds were sown in laboratory and germination percentage, germination velocity, vigor index, plumule and radicle length and seedling dry weight were calculated. In greenhouse condition, shoot and root length, seedling dry weight, dry weight to fresh weight ratio, leaf area and specific leaf area were measured. According to the results, in both studied species germination percentage, plumule and radicle length, seedling dry weight, leaf area and specific leaf area were reduced with increase of salinity. The results showed significant differences between two species for germination percentage and germination velocity (P≤0.01). In both germination and vegetative growth stages, Ag.elongatum was more salt tolerant than Ag.desertorum. The results indicated that Ag.elongatum was more salt tolerant species than Ag.desertorum and it can be recommended for cultivation in moderate saline rangelands.
Ebrahim Rahmani; Ali AShraf Jafari; Eman Ghalanader
Volume 16, Issue 1 , December 2009, , Pages 66-78
Abstract
In order to study of variation for both seed and forage production and relationships among yield and its components, 18 genotypes of Crested wheatgrass(Agropyron cristatum) were examined under two normal and drought stress conditions using complete block design with 3 replications during 2003 in Broujerd, ...
Read More
In order to study of variation for both seed and forage production and relationships among yield and its components, 18 genotypes of Crested wheatgrass(Agropyron cristatum) were examined under two normal and drought stress conditions using complete block design with 3 replications during 2003 in Broujerd, Iran. Data were collected for ear emergence date , pollination date, milky date, seed mature date, stem density, spike length, peduncle length, 1000 grain weight, seed weight per spike, seed number per spike, plant height, dry matter yield, seed yield and harvest index. Data were analyzed over two normal and drought stress conditions. The results showed that the effects of genotypes were significant for all traits except seed maturity date and 1000 grain weight. The genotypes by environment interaction effects were significant for all of traits except seed milky, seed maturity date, stem density, spike length and harvest index. Results showed that 208S, 1727P12 having 256 and 269 Kg/h and 619S and 619M with having 1730 and 1703 Kg/h had higher seed and forage production respectively. The genotypes 4056P4, 4056P1, 208S, 619S 208M with average values of 230 to 260 Kg/h seed and 1480 to 1730 kg/h dry matter yield were introduced for sowing under both irrigation and non irrigation areas. The results of correlation analysis showed that dry matter yield was negatively correlated with ear emergence date, pollination date, milky date, seed mature date and harvest index and positively with plant height. Seed yield had a positive relationship with harvest index, seed weight and seed number per stem.