HOSEIN nAZARLI; ali naderi arefi
Abstract
Objective: In order to improve the tolerance of German chamomile cultivars to moisture regimes, this factorial experiment was conducted in a randomized complete block design in three replicates, in the agricultural college of Tehran university in 2013-14 cropping season.
Methods: Experimental treatments ...
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Objective: In order to improve the tolerance of German chamomile cultivars to moisture regimes, this factorial experiment was conducted in a randomized complete block design in three replicates, in the agricultural college of Tehran university in 2013-14 cropping season.
Methods: Experimental treatments included moisture regimes (control and severe stress, i.e., 13% and 57% of allowable soil moisture depletion, respectively), two cultivars of chamomile (German Badgold and Hungarian modified cultivar) and foliar application with putrescine (with a concentration of 0.1 mM and 45 days after transfer to the pots).
Results: The results showed that the simple effect of putrescine polyamine on plant height and biomass was significant at 1% level and on harvest index at 5% level. Plant height did not have a significant response to putrescine in control conditions, but in severe stress (57% of soil water depletion), the effect of foliar application showed a significant boost (13.5%). The simple effect of putrescine on percentage and essential oil yield (at 1% level) was significant. Also, the interaction effect of moisture regimes and foliar application with putrescine on essential oil content (at 5% level) and essential oil yield (at 1% level) was considerable. Under optimal moisture conditions (13% of soil water depletion), putrescine resulted in a significant increase in essential oil content by 38%. But its foliar application in drought stress increased the essential oil content by only 4%. Foliar application of putrescine reduced the amount of farnesene and bisabolol B oxide in both conditions. Another important compound was bisabolone oxide A, wherein putrescine treatment had a positive effect on its accumulation so that under favorable conditions of moisture its concentration increased by 87%, but under conditions of stress its effect decreased, showing only 35%.
Conclusion: The use of putresin in chamomile is economically justified due to increased tolerance to dehydration stress and increased target secondary metabolites.
ali naderi arefi
Abstract
In order to investigate the effects of reduced row spacing from usual 75 cm to 25 cm (UNR), an experiment has been conducted in two locations: Davarabad agricultural research station (Semnan Province) and Varamin Central Agricultural Research Station. The experimental design is RCBD laid out in split ...
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In order to investigate the effects of reduced row spacing from usual 75 cm to 25 cm (UNR), an experiment has been conducted in two locations: Davarabad agricultural research station (Semnan Province) and Varamin Central Agricultural Research Station. The experimental design is RCBD laid out in split plots with three replications. The main plots are the planting dates (May 22 and Jun 5, 2020) and five cultivars, i.e. Khorshid, Kashmar, Sajedi, Hekmat, and Khordad serve as the sub plots. The results show that location effect on vegetative and reproductive attributes has been significant. UNR boosts the yield in Aradan, but in Varamin region, this planting method, not only has failed to increase the yield, but has reduced it significantly. This is due to reducing the boll number as a result of rank growth of plants in UNR system. Reduction of row spaces from 75 to 25 cm enhances the number of monopodials, sympodials, and plant height. In Varamin, plant height of all cultivars are higher than 119 cm. the highest yield in this region obtained from Khordad as Control (3886 kg seed ha -1). The highest yield in Aradan, obtained from Khorshid (5702.5 kg seed ha -1) in UNR system. This shows that the UNR planting of zero type varieties is more adabtable for Garmsar condition than that of Varamin.
ali naderi arefi; ali ahmadi; Manijeh Sabokdast
Abstract
This study was carried out to examine the effects of drought stress on cotton leaf characteristics and its yield during 2014. The experiment was conducted in greenhouse and field conditions at Garmsar agricultural research station. The experimental design was RCBD with 3 replications arranged in split ...
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This study was carried out to examine the effects of drought stress on cotton leaf characteristics and its yield during 2014. The experiment was conducted in greenhouse and field conditions at Garmsar agricultural research station. The experimental design was RCBD with 3 replications arranged in split plots. Main plots and subplots designated to water stress levels and genotypes, respectively. In greenhouse, water stress decreased RWC and Excised Leaf Water Loss (ELWL). RWC of genotypes No.221, Aria, Narabri, and Sepid was higher than the others. ELWL of Aria, K8801 and K8802 was more than other genotypes whichalso their RWC was higher. ELWL of Varamin and Sahel cultivars were the lowest. At field conditions, the effects of 9, 12, 18, 24 and 30 day irrigation intervals after first flower stage, on yields of these cultivars were studied. Nine days intervals increased the yield of Varamin, Khordad and K8801 but their difference was not statistically significant. At fourth and fifth irrigation intervals,the yield of all genotypes decreased. 18 days intervals lead to yield loss too, but, because of insignificant decrease and for efficient use of water, it can be recommended that after normal irrigation from planting to first flower, to irrigate of cotton at 18 day intervals. Extension of K8801 can reduce water use and may help to permanent production.
ali naderi arefi; mohammad abedini esfahlani
Abstract
To determine the best planting date and irrigation schedule in a cotton field (Gossypium hirsutum var.Varamin) in Garmsar region an experiment was conducted in 2011. The experimental design was splitplot based on randomized complete block with three replications. Three irrigation termination dates (2011Sep ...
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To determine the best planting date and irrigation schedule in a cotton field (Gossypium hirsutum var.Varamin) in Garmsar region an experiment was conducted in 2011. The experimental design was splitplot based on randomized complete block with three replications. Three irrigation termination dates (2011Sep 11th, 2011 Sep 21st and 2011 Oct 2nd) arranged in main plots as main factor and three planting dates(2011 May 10th, 2011 May 25th and 2011 Jun 9th) located in sub plots. During the growth season,phonological events such as germination, date of flowering, date of boll formation, boll opening, maturityand after harvest attributes such as plant tall, number of boll per plant and weight of boll were recorded.The result showed that effect of planting date on seed cotton yield, plant/m2, boll per plant and plantsheight was significant but boll weight was not affected significantly by this treatment. First planting dateand first irrigation termination date with 7729 kg/ha of seed cotton yield is the best treatment. Because ofstable environmental conditions in years of experiment, the effect of these treatments on studiedtreatments is not significant. Totally, two first planting dates has the higher yield than third and first dateof irrigation termination is the best because of decreasing the number of irrigation.