Mohammad Yazdandoost Hamedani; Mokhtar Ghobadi; Mohammad Eghbal ghobadi; Saeid Jalali Honarmand; mohsen saeidi
Abstract
In order to evaluate the effect of foliar application of some chemicals on antioxidant enzymes activity and chlorophyll fluorescence of sunflower in different irrigation conditions as well as identifying compounds’ effectiveness in reducing the adverse effects of drought stress, this experiment ...
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In order to evaluate the effect of foliar application of some chemicals on antioxidant enzymes activity and chlorophyll fluorescence of sunflower in different irrigation conditions as well as identifying compounds’ effectiveness in reducing the adverse effects of drought stress, this experiment has been conducted at the Agricultural Research Center of Hamedan, Iran, between 2015 and 2016. Three irrigation and six foliar application treatments are evaluated in a split plot experiment based on randomized complete block design with three replications. Irrigation treatments consist of 60%, 80%, and 100% plant water requirement and foliar application treatments include abscisic acid 40 μM, Selenium 20 mg/L, Salicylic acid 500 μM, SNP 100 μM, Glycine betaine 100 mM, and the control. Results show that by decreasing the irrigation water, the activity of superoxide dismutase, peroxidase, and catalase enzymes rise sharply, while the maximum photochemical efficiency of photosystem II and grain yield decline. The interaction effect of irrigation × foliar application on the activity of antioxidant enzymes and grain yield is significant, but not so on chlorophyll fluorescence. In deficit irrigation treatments, foliar application of all chemical compounds significantly boost the activity of antioxidant enzymes, compared to the control. Application of salicylic acid raises the maximum photochemical efficiency of photosystem II and grain yield, at all irrigation conditions. Under 60%, 80%, and 100% irrigation conditions, salicylic acid application increases grain yield by 24.3%, 10.1%, and 4.9%, respectively.
Mahdi Motaefi; Alireza Sirousmehr; Mohsen Mohsen Mousavi nik
Abstract
Drought stress is the most important factor in crop yield reduction. It is important to know how to cope with drought. This experiment is carried out to investigate the effect of organic growth stimulator (Hamoon green) on yield and some physiological indices of safflower under drought stress, during ...
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Drought stress is the most important factor in crop yield reduction. It is important to know how to cope with drought. This experiment is carried out to investigate the effect of organic growth stimulator (Hamoon green) on yield and some physiological indices of safflower under drought stress, during 2017-2018 in university of Zabol (Chahnime) as a split plot, based on RCBD with three replications. Experimental treatments include drought factor based on plant growth stages at three levels (complete irrigation throughout the growing season, irrigation up to terminal bud forms, and irrigation up to completed flowering) and spraying factor of organic growth stimulator at 4 levels (pure water), the foliar application has been Hamoon green 1 liter in 10 liters + calcium, Hamoon green 1 liter in 20 liters + calcium and Hamoon green 1 liter in 30 liters+ calcium. Results show that drought has reduced the height, 1000-seed weight, and oil percentage, by 44.41%, 31.24%, and 17.10%, respectively. Spraying hamoon green 1 liter in 10 liters+ calcium leads to an increase of 18.03%, 13.90%, and 13.74% for the above traits, compared to the control. The highest grain yield (1882.55 kg.ha-1), chlorophyll a, b, total and carotenoids (3.49, 0.94, 4.44, and 7.37 mg.gr-1 fw, respectively), selenium content (5.18 mg.kg-1 fw) and seed calcium content (2.91%) are obtained from hamoon green 1 liter in 10 liter + calcium and complete irrigation treatment. In general, it seems that by spraying 1 liter per 10 liters+ calcium, a good performance can be achieved.
Hossein Noroozi; Majid Nabipour; Afraseyab Rahnama Ghahfarokhi; Habibola Roshanfekr
Abstract
In order to investigation the effect of planting date and foliar application Zinc sulfate and Selenium on tolerance to high temperature on two Wheat cultivars one experiment was carried out in a split factorial experiment based on a complete randomized block design with three replications at the experimental ...
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In order to investigation the effect of planting date and foliar application Zinc sulfate and Selenium on tolerance to high temperature on two Wheat cultivars one experiment was carried out in a split factorial experiment based on a complete randomized block design with three replications at the experimental farm of Shahid Chamran University of Ahvaz during a growing season 2017-2018. Three factors were investigated in this experiment. initial factor including three planting date (Nov 11, Des 11, Jan 10). The solution type was used as the second factor: 1- foliar application with tap water (control), 2- foliar application with selenium (4 mg/lit), 3- foliar application with zinc sulfate (0.04%) and third factor including two wheat cultivars (Chamran and Star). According to the results in planting date of 20 January, the number of grains per spike decreased in the foliar application treatments by zinc solfate 10%, Selenium 36% and control 33% compared to similar treatments in the planting date of November 20th. In the planting date of January 20, the decrease in grain yield compared to the planting date of November 20th was 49.3% in the control treatment and 49.9% in the selenium treatment While in zinc sulfate treatment, yield reduction was 20.19%. According to the results obtained in folia application, Zn sulfate increased grain yield in two wheat cultivars by increasing the number of grains per spike, 1000- grain weight and grain filling duration.
Masoumeh Naeemi; Gholam Ali Akbari; Amir Hosein Shirani Rad; Tahere Hasanloo; Gholam Abbas Akbari; Mahdieh Amirinejad
Abstract
In order to evaluate the effect of zeolite application and selenium spraying on some physiological traits and grain yield in medicinal pumpkin (Cucurbita pepo L.) under different moisture regimes, a study was conducted in a factorial experiment based on randomized complete block design with three replications ...
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In order to evaluate the effect of zeolite application and selenium spraying on some physiological traits and grain yield in medicinal pumpkin (Cucurbita pepo L.) under different moisture regimes, a study was conducted in a factorial experiment based on randomized complete block design with three replications during 2010 in Takestan at Gazvin province, Iran. The three levels of irrigation factors including normal irrigation based on 60mm evaporation from class A pan (control), withhold irrigation at the flowering and fruit formation stages, zeolite factors including two levels of non-application and use of 10 tons per hectare and selenium was sprayed at two concentration in zero and 30 grams per liter per hectare. The results showed that water deficit stress decreased stomatal conductivity, carotenoid content, chlorophyll a, total chlorophyll, grain yield and increased proline concentration and chlorophyll b content. Zeolite application of 10 tons per hectare under water deficit stress conditions had desirable effect on chlorophyll a and chlorophyll b content and grain yield, also improved traits as stomatal conductivity and reduced proline concentration. The highest grain yield (1329 kg.ha-1) was obtained with zeolite and selenium application together at normal irrigation conditions. According to the results, it seems that application of zeoilite and selenium in areas that are subjected to water deficit stress can be useful in improving plant growth and production.