Mohsen Seilsepour; Ahmad Golchin; Mohammad Reza Rouzban
Abstract
A greengouse experiment was conducted to evaluation of salinity stress on growth parameters of two olive cultivars during 2013-2014 at Agricultural and Natural Resources Research Center of Tehran. In the experiment, effects of five levels of irrigation water salinity including 0, 4, 8, 12 and 16 dS.m-1 ...
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A greengouse experiment was conducted to evaluation of salinity stress on growth parameters of two olive cultivars during 2013-2014 at Agricultural and Natural Resources Research Center of Tehran. In the experiment, effects of five levels of irrigation water salinity including 0, 4, 8, 12 and 16 dS.m-1 were evaluated on ʻZardʼ and ʻMissionʼ olive cultivars under soilless culture. Data showed that salinity had significant effects on all growth parameters in both olive cultivars. Leaf dry weight, shoot and root dry weight, leaf chlorophyll index, shoot and root tolerance index, shoot and internodes length, leaf area, leaf number and leaf relative water content were affected by salinity and significantly decreased. These reductions were more in ʻZardʼ comparing to ʻMissionʼ. Shoot dry weight, leaf dry weight and root dry weight were decreased 80, 80 and 69 percent, respectively at 16 dS.m-1 salinity treatments with compare to control. Leaf sodium (Na+) concentration and rate of sodium to potassium (K+) in leaf were increased and leaf potassium concentration was decreased by salinity. Increase of Na+ and decrease of K+ were more in ʻZardʼ comparing to ʻMissionʼ. Also, leaf and shoot dry weight were affected by concentration of Na+, K+ and Na+: K+ in leaf and there were a significant correlation among these parameters with leaf and shoot dry weight. Results indicated that ʻMissionʼ variety were more salt tolerance than ʻZardʼ.
Ali Akbar Ghasemi; Hassan Hamidi; Jaber Arves; Ali Masomi
Abstract
In order to study the effects of salinity stress (made by sodium chloride and calcium chloride) andtemperature interaction on germination characteristics of hyssopus officinalis, an experiment was conducton factorial basis and in a completely randomized design with three replication at laboratory of ...
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In order to study the effects of salinity stress (made by sodium chloride and calcium chloride) andtemperature interaction on germination characteristics of hyssopus officinalis, an experiment was conducton factorial basis and in a completely randomized design with three replication at laboratory of KhorasanRazavi Agriclultural and Natural Resource Research Center in 2010. In this experiment, different osmoticpotentials (0, -3, -6 and -9 bar) and also different temperatures (20, 25, 30 and 35 centigrade degree) wereused. In this research, the percentage and rate of germination, the length of radicle and plumule, lengthratio of radicle and plumule and seed vigor characteristics has been measured. The results showed a verysignificant effect of salt levels, osmotic potential and temperature on the above characteristics. The meancomparison for percentage and rate of germination characteristics showed that calcium chloride with 63%and 7.11 respectively had a significant difference with sodium chloride with 50% and 1.70. The highestpercent and rate of germination were seen in -3 bar osmotic potential made by calcium chloride in 25centigrade degree. The highest length of radicle and vigor was in -3 bar osmotic potential made bycalcium chloride in 20 centigrade degree. The highest length of plumule was seen in both sodium chlorideand calcium chloride in 0 bar (control) osmotic potential and 30 centigrade degree. Generally while theosmotic potential increases and temperature goes up to 30 centigrade degree all the characteristics insodium chloride and calcium chloride had a remarkable reduction. Also increment of high temperatureshad more harmful effects in NaCl than CaCl2. Study the Hyssop plant response to different levels ofsalinity and temperature on germination stage, it will assist farmers in establishment and desirableproduction.
Masoumeh Pouresmael; Jalal Rastegar; Mehdi Zangiabadi
Abstract
In this study, salinity tolerance of 51 Kabuli chickpea genotypes was investigated at vegetative growth phase using 4.5 and 6.5 ds/m salt solution (by adding NaCl to 1/2 Hoagland solution) and 1/2 Hoagland solution (EC= 1.7 ds/m) as control treatment. A split plot design was used in this experiment where ...
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In this study, salinity tolerance of 51 Kabuli chickpea genotypes was investigated at vegetative growth phase using 4.5 and 6.5 ds/m salt solution (by adding NaCl to 1/2 Hoagland solution) and 1/2 Hoagland solution (EC= 1.7 ds/m) as control treatment. A split plot design was used in this experiment where the main plot was salinity treatments and the sub plot was genotypes. Treatments continued until 40 days and after that, shoot length, leaf area, chlorophyll content and biomass ratio were measured. Genotypes responded differently to saline condition. Based on vegetative biomass production under salt treatments in comparison with control treatment, different salinity tolerance indices calculated. Ranking of genotypes based on these indices indicated that, the genotypes number 5620, 6364, 5941, 5280, 6142, 6356, 5843 and Hashem cultivar were more tolerant to salinity. Under 6.5 ds/m NaCl, genotype 6142 was the most tolerant genotype. Sowing the genotypes at saline soil generally affected by Na+ and Cl- with electrical conductivity of 9.8 ds/m at Neishabur (Feiz abad) field caused strong damages on all the genotypes and 60 days after planting none of the genotypes could survive at saline field. High salinity level in the field in comparison with salinity tolerance threshold of the chickpea genotypes might be the reason for this reaction
Amir hooshang Jalali; Peyman Jafari
Abstract
To investigate the effect of K fertilizer on yield and yield components of three watermelon cultivars, a two-year study (2007-2008) was conducted in Ardestan Agricultural Research Center (Isfahan province) by using of split plot randomized based on complete block design in three replications. Three watermelon ...
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To investigate the effect of K fertilizer on yield and yield components of three watermelon cultivars, a two-year study (2007-2008) was conducted in Ardestan Agricultural Research Center (Isfahan province) by using of split plot randomized based on complete block design in three replications. Three watermelon cultivars (‘Sugar baby’, ‘Charleston Grey’ and ‘Mahbubi’), were assigned as main plots and four K fertilizer levels (zero, 50, 100, and 150 kg K.ha-1) were assigned as subplots. Two and three times higher than consumption of K fertilizer (100 and 150 kg K.ha-1) in compared to normal conditions (without salinity), led to a 24.8 and 18.5 percent increase in yield of ‘Charlston Gray’ and ‘Sugar Baby’, respectively. The highest fruit yield (39112 kg.ha-1), was obtained using 150 kg K.ha-1 in ‘Charleston Gray’ cultivar. Potassium applications at all levels, increased fruit number in ‘Sugar Baby’ and fruit weight in ‘Charleston Gray’, were considered as the main reason for increasing yield. By increasing of K application, the ratio of Na/K in the leaves from 0.61 to 0.33 and in the stems from 0.81 to 0.4 was decreased. The results indicated that in saline conditions, higher levels of K fertilizers can reduce the deleterious effects of salinity and thus may improve watermelon yield.