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Showing 9 results for Growth Regulator
S. Farjam, A. Rokhzadi, H. Mohammadi, S. Ghaleshakhati,
Volume 6, Issue 23 (12-2014)
Abstract
Drought tension is one of the main factors restricting the growth of crop plants and compounds such as salicylic acid can affect drought tolerance in plants. In this research the effect of cut irrigation tension and foliar application of salicylic acid on growth, yield, yield components and oil percentage of three safflower cultivars was studied in a split-plot factorial layout with randomized complete blocks design with three replications in Agriculture and Natural Resources Research Station in Gorizeh Sanandaj. In this experiment irrigation treatment as the main factor in three levels: total irrigation as control, cut irrigation practices at vegetative stage and cut irrigation practices at reproductive stage and three cultivars of safflower Sina, Faraman and Isfahan landrace and three levels of salicylic acid: without foliar application, 50 milligram per liter and 100 milligram per liter as foliar application were considered in sub-plots at the beginning of vegetative stage .The results showed that cut irrigation practices caused reduction in plant dry weigh, primary branch number, grain yield, number of capitol in plant, number of seed in capitol, one thousand-grain weight and oil percent. Faraman cultivar had the highest number of primary branch (14/33) and Sina cultivar the highest number of seed per Capitol (31/30) and the lowest amount of plant dry biomass (22/80) was allocated to Isfahan landrace cultivar. On the other hand foliar application Salicylic acid by concentration 100 milligram per liter led to the increasing the primary branch number and one thousand-grain weight and in Faraman cultivar caused increasing the grain yield (1502 kilogram per hectare) and the number of capital per plant (58). Plant dry weight, number of seeds per capitol and oil percentage were not affected significantly by foliar application of salicylic acid
H. Nouriyani,
Volume 7, Issue 25 (6-2015)
Abstract
In order to investigate the effect of plant growth regulatory of paclobutrazol on the amount of redistribution of assimilates to the grain of three cultivars of wheat under favorable and terminal heat tension conditions two independent experiments were conducted as split plots in a randomized complete blocks design and with four replications in Dezful area in 2013-2014 cropping year. The first experiment ncluding the cultivation of wheat cultivars (Star, VeerNac and Chamran) in recommended date (November) and in order to coincide phenological stages of plant growth with terminal heat tension after pollination, planting date in another experiment was considered on the first of February. In each experiment, four levels of paclobutrazol included zero, 50, 100 and 150 mg per liter as main plots and three cultivars of bread wheat included Star, VeerNac and Chamran were considered as sub plots. Results showed that paclobutrazol consumption significantly increased the amount of redistribution of food storage and current photosynthesis of wheat cultivars in both favorable and terminal heat tension conditions. Heat tension, reduced the amount of redistribution and the amount of current photosynthesis about 12 and 31 percentage, respectively. Average share of the redistribution of wheat cultivars in heat tension conditions compared to favorable conditions, 17 percentage increased. The highest and lowest amount of share of the redistribution in heat tension conditions compared to favorable conditions was dedicated to the late maturity cultivar Star and earlymaturity VeerNac, respectively. In this research, the positive effect of using paclobutrazol on the gradient of the changes the amount of grain yield in terminal heat conditions was more than favorable conditions, so that the average increase in grain yield of paclobutrazol applying treatments in studied cultivars of wheat compared to the control treatment (non-use of paclobutrazol), in favorable conditions, was about 17 percentage and in season terminal heat tension conditions, about 23 percentage.
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Volume 8, Issue 31 (12-2016)
Abstract
In order to investigate the effect of cycocle and Azotobacter and Pseudomonas inoculation with seed on quantitative and qualitative yield, rate and grain filling period of wheat under water limitation conditions, this experiment as factorial based on randomized complete blocks design with three replications was conducted at the research farm of Faculty of Agricultural Sciences, University of Mohaghegh Ardabili, during 2014-15 cropping year. The first factor included irrigation levels at three levels (full irrigation, irrigation to 50 % of heading and irrigation to 50 % of booting stage, equivalent to 45 and 59 Zadoks code, respectively), and the second factor included seed inoculation with bio fertilizers at four levels (without inoculation as control, seed inoculation with Azotobacter chrocoocum strain 5, Pseudomonas putida strain 186 and simultaneous using of both Azotobacter+ Pseudomonas) and the third factor included foliar application of cycocle at four levels ( non- consumption, 400, 800 and 1200 milligram per liter of cycocle). The results showed that the effect of water limitation, cycocle and bio fertilizers on grain filling period (at one percent probability level) and quantitative yield (at five percent probability level) and protein content (at one percent probability level) was significant. The highest grain yield (3822 kilogram per hectare) was obtained from foliar application treatment combination of 1200 milligram per liter cycocle, seed inoculation with Azotobacter and Pseudomonas under normal irrigation conditions and the least of it (1409.7 kilogram per hectare) was obtained to non-application of cycocle and non-inoculated seed at irrigation cut conditions at booting stage. Applying irrigation cut at booting stage resulted in the maximum reduction in most traits related to yield and yield components and maximum photochemical efficiency of II in wheat.
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Volume 8, Issue 32 (3-2017)
Abstract
In order to study yield, dry matter accumulation, rate and duration of wheat grain filling in response to different levels of cycocel under soil salinity conditions, a factorial experiment was conducted based on randomized complete blocks design with three replications in research greenhouse of the Faculty of Agriculture, University of Mohaghegh Ardabili in 2015 cropping year. Under studied treatments including soil salinity at four levels (zero as control, 25, 50 and 75 milli Molar at soil) using NaCl and foliar application with cycocle at four levels (non-application, 400, 800 and 1200 milligram per liter). Results showed that with increasing soil salinity, yield, rate and duration of grain filling, root weight, total biomass and crop growth rate decreased. Means comparison showed that the maximum number of grains per spike (25.66), grain filling rate (1.48 gram per day), effective grain filling period (38.51 days), grain filling duration (42.21 days) and maximum grain weight (38.51 g) were obtained from foliar application of 1200 milligram per liter cycocel in non-application soil salinity conditions. Foliar application of 400, 800 and 1200 milligram per liter cycocel increased 8.86, 24.05 and 41.77 percent grain yield, respectively, compared to control. It seems that foliar application of 1200 milligram per liter of cycocel can be recommended to improve wheat yield in soil salinity conditions.
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Volume 8, Issue 32 (3-2017)
Abstract
Due to positive effect of pyridoxine and kinetin on germination and salinity tolerance induction in sunflower, this experiment was carried out as factorial arrangement based on completely randomized design with three replications in Agricultural Research Center of Rasht in 2014. Experimental factors consisted of pyridoxine (0, 0.03 percent and 0.06 percent), kinetin (0, 10 and 20 milligram per liter) and salinity (0, 50 and 100 milliMolar NaCl). The results showed that the interaction between salinity × pyridoxine × kinetin was significant on all measured traits except oxidative enzymes. The interaction between pyridoxine × kinetin was significant on peroxidase enzyme. Also, the effect of pyridoxine and the interaction between salinity × kinetin were significant on the amount of proline and catalase enzyme. Under salinity tension (100 milliMolar), the highest germination percentage was obtained by treatment 10 milligram solution kinetin × pyridoxine non application. The interaction between salinity (50 milli Molar NaCl) × kinetin (zero) × pyridoxine (0.06 percent) showed the highest rate of germination. The results of this experiment showed that the highest rate of peroxidase enzyme was allocated to the interaction between kinetin 20 milligram × pyridoxine (0.06 percent). The highest rate of proline in leaf of sunflower seedling was observed in the interaction between treatments of kinetin (20 milligram) × salinity (100 milli Molar) and pyridoxine (0.06 percent)× salinity (100 milli Molar NaCl), respectively. Based on this research findings, seed priming by kinetin (20 milligram per liter) and pyridoxine (0.06 percent) caused increasing the rate of peroxidase enzyme and proline and enhancing salinity tension tolerance in sunflower seedlings.
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Volume 9, Issue 33 (6-2017)
Abstract
In order to investigate the effect of water deficit tension on mother plant, on vigor and seedling emergence rate percentage of safflower cultivars, the present research was conducted in split plot factorial with randomized complete blocks design with three replications at research farm of Faculty of Agriculture, University of Mohaghegh Ardabili in 2014. Treatments at the main plots included water tension (main plot) in three irrigation levels after 80 millimeter (normal irrigation); 120 millimeter (moderate tension); 160 millimeter (sever tension) evaporation from evaporation pan class A and sub plot included three cultivars of spring safflower (Goldasht, Sina and Faraman) and growth regulator on Brassinosteroid (no consumption and consumption of 10 -7 molar). The results showed that drought tension decreased one-thousand seed weight, percentage and speed of germination, length (radicle, plumule, and seedling), seedling dry weight and seedling vigor index, so that it dropped compared to normal level 14/34%, 79/87%, 66/11%, 30/92%, 34/55%, 32/60% and 48/55%. And among cultivars, Goldasht cultivar had the highest one-thousand seed weight, seedling dry weight, rate and percentage of germination, rootlet length and seedling vigor index. But treatment of brassinosteroide just caused significant increase in one-thousand seed weight and seedling dry weight. For other researchers, it is recommended to use bradycinosteroids at the grading stage. Because the effect of brassinosteroid is likely to decrease over time from flowering to seeding.
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Volume 9, Issue 36 (3-2018)
Abstract
Unfavorable environmental conditions cause tension in plants and impairment in the development and survival of plants. Water deficit is one of the most important environmental factors limiting the cultivation of almond under rain fed conditions of Guilan province. The foliar application of plants growth regulators, such as ascorbic acid and methanol due to physiological and morphological effects improve plant tolerance to unfavorable environmental conditions. The present factorial experiment was conducted in a randomized complete blocks design with three replications in two locations north of Iran (Astaneh Ashrafiyeh and Kiashahr) in 2015 cropping year. Two factors investigated including methanol foliar application at four levels of zero (control), 7, 14, and 21 volumetric percentage and four levels of ascorbic acid foliar application at zero (control), 250, 500, and 750 milligram per liter were considered. Foliar application spraying started during code stage 73 (pod growth) and it was repeated 15 days later. The results showed the simple effects of methanol and ascorbic acid foliar applications on measured pod yield, mature pod number per plant, shelling percentage, one-hundred seed weight, immature pod number per plant, plant height, seed protein and seed oil traits were positive and significant. The results of the experiment showed that foliar application of growth regulators increased peanut yield under rain fed conditions by improving the seed yield components. The maximum amount on pod yield, mature pod number per plant and shelling percentage traits were observed by two foliar application treatments of methanol (14 and 21 volumetric percentage) and two ascorbic acid treatments (500 and 750 milligram per liter). Therefore, it can be concluded that in the conditions of peanut rain fed cultivation, the use of methanol and ascorbic acid can improve grain yield and yield components.
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Volume 10, Issue 39 (12-2018)
Abstract
The present research was carried out as factorial experiment based on randomized complete blocks design with three replications on forage corn hybrid ZP600 in Mashhad in 2017. The experimental factors included Paclobutrazol with concentrations zero, 10, 20 and 30 milligram per liter and drought tension levels including irrigation after 50 millimeters (without tension), 70 millimeters (mild tension), 100 millimeters (moderate tension) and 150 millimeters (severe tension) evaporation from evaporation pan class A. Foliar application of Paclobutrazol was applied in two steps (at 6-8 leaf stage and was repeated 2 weeks later). The results showed that plant height, leaf number, leaf area index, leaf dry weight and fresh forage yield decreased by drought tension and proline content of leaf and insoluble fiber in neutral detergent increased significantly, but protein percentage and protein yield did not change significantly. Application of Paclobutrazol in medium and severe tension increased plant height, leaf area index, leaf dry weight and fresh forage yield, and decreased proline and insoluble fiber content in neutral detergent. Paclobutrazol also increased protein yield under tension and non –tension conditions. The highest fresh forage yield (103 tons per hectare) was obtained in 20 milligram per liter Paclobutrazole treatment under severe tension conditions and the lowest fresh forage yield (72 tons per hectare) in non-application of Paclobutrazol in severe tension. Application of Paclobutrazol at a concentration of 20 milligram per liter in moderate and severe tension could reduce the effect of drought tension by 24 and 43 percent, respectively.
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Volume 10, Issue 40 (3-2019)
Abstract
In order to investigate the effect of salicylic acid and humic acid to mitigate the impact of drought tension during pollination of forage maize, the present experiment was conducted as split plots based on randomized complete blocks design with three replications at Isfahan University of Technology. Drought tension levels included: without tension (control), mild tension (75 percent crop capacity) and severe tension(50 percent crop capacity) in the main plots and type of growth regulator (without growth regulator, salicylic acid and humic acid) in sub plots were investigated. The results showed that drought tension significantly reduced relative water content of leaves, chlorophyll, leaf area index, leaf weight, stem weight, ear weight, forage yield and water use efficiency compared to optimal irrigation. The use of salicylic acid in comparison to control and humic acid under mild tension conditions significantly increased leaf relative water content (61/2 and 39/3 percent), leaf weight (60/5 and 41/6 percent, respectively), stem weight (14/5 and 25/09 percent, respectively), ear weight (13/1 and 23/7 percent, respectively), proline content (16 and 32/3 percent, respectively), forage yield (24/5 and 24/2 percent, respectively) and water use efficiency (respectively, 15/21 and 34/28 percent, respectively). Application of salicylic acid treatment due to reduction of tension damage for forage yield and water use efficiency in drought tension conditions showed a significant difference at five percent probability level compared to humic acid. Regarding the obtained results, although drought tension reduced yield, the effect of salicylic acid could compensate for the reduction of yield due to drought tension.
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