Shilan Aslani; Taher Barzegar; Jaefar Nikbakht
Abstract
In order to study the effect of water deficit stress and foliar spray of humic acid (HA) on physiological and yield traits of tomato, an experiment was carried out in a split plot based on randomized complete block design with three replications at the research filed of University of Zanjan, in 2016. ...
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In order to study the effect of water deficit stress and foliar spray of humic acid (HA) on physiological and yield traits of tomato, an experiment was carried out in a split plot based on randomized complete block design with three replications at the research filed of University of Zanjan, in 2016. Treatments consisted arrangement of three irrigation levels (starting irrigation at 100, 80 and 60 percent ETc) and 4 levels of HA (0, 100, 200 and 300 mg.l-1). The results showed that deficit irrigation significantly decreased stomatal conductance, membrane stability index, leaf relative water chlorophyll a and b content and plant yield, and increased the proline content and proxidase activity. Treatment of HA enhanced proxidase activity, leaf relative water content, proline, chlorophyll, membrane stability index and plant yield under normal and deficit irrigation, and decreased stomatal conductance. The highest peroxidase activity (1.207 uints.g-1FW.Min-1) and proline content (11.5 mg.gFW-1) was obtained with treatment of HA 200 mg L-1 under irrigation 60 percent ETc. Also, maximum leaf relative water content (78.6 percent) and membrane stability index (70.01 percent) was achieved in HA 300 and 200 mg L-1, respectively under irrigation 100 percent ETc. The maximum plant yield was obtained with application of HA 200 mg L-1 under irrigation 100 %ETc. According to the results, application of HA 200 mg L-1 can be proposed to improve physiological traits and increase fruit yield.
Safoura Kazemi; Rahim Barzegar; Abd-Alrahman Mohammadkhani
Abstract
The present investigation was carried out to evaluate the effect of vermivash on yield and leaf nutrient status of strawberry "Govieta" at research greenhouse of Shahrekord University in 2013. Treatments were included control (without vermiwash foliar spray) and different concentration of vermiwash (10, ...
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The present investigation was carried out to evaluate the effect of vermivash on yield and leaf nutrient status of strawberry "Govieta" at research greenhouse of Shahrekord University in 2013. Treatments were included control (without vermiwash foliar spray) and different concentration of vermiwash (10, 15 and 25 percent) that spryed at 1, 2 and 3 weeks interval. Vermiwash was extracted from cow manure vermicompost through earthworm Eisenia foetida. The experiment was conducted in completely randomized design (CRD) with three replications. The results showed that there was significant difference between vermiwash treatments and control for the leaf elements of N, K and Fe, but was not significant for the other macro and microelements. Leaf Fe concentration increased up to excessive level in 25 percent concentration with weekly interval. Foliar spray of 25, 15 and 10 percent vermiwash with two-weeks intervals considerably enhanced the number of fruit and yield per plant, but decreaced fruit weigth average a little. Increasing the yield per plant ranged between 24 and 68g for various vermiwash treatments in comparison with control. Vermiwash treatments had no effect on inflorescence number per plant and flower number per inflorescence. Foliar spray of 15 and 10 percent vermiwash with two-weeks interval improved the yield of strawberry "Govita".
Nasimeh Montazeri Takhti; Gholam Reza Khajoei Nejad; Mohammad Javad Arvin
Abstract
Effects of drought stress and chemical treatments was studied on growth and developmental traits of four barley cultivars using a split- split plot design (RCBD) in Agricultural Research Farm, Kerman University in 2013-14. Main plots consisted of irrigation (control and drought stress after flowering), ...
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Effects of drought stress and chemical treatments was studied on growth and developmental traits of four barley cultivars using a split- split plot design (RCBD) in Agricultural Research Farm, Kerman University in 2013-14. Main plots consisted of irrigation (control and drought stress after flowering), sub-plots consisted of four barley cultivars (ʻNosratʼ, ʻAfsalʼ, ʻYousofʼ and ʻUH12 lineʼ) and sub-sub plot consisted of control, salicylic acid (0.5 mM) as seed soaking, foliar spray at anthesis and seed soaking + foliar spray) and also foliar spray with selenium (40 mg/l using sodium selenate). Drought stress significantly decreased chlorophyll index (10 percent), thousand grain weight (19 percent), grain yield (20 percent), biological yield (11 percent) and harvest index (12 Percent). On the contrary, salicylic acid increased plant height, length of spike and awn, chlorophyll index, thousand grain weight, grain yield, biological yield and harvest index. Foliar spray of plants with sodium selenate increased selenium contents of grains in all cultivars. However, it could be concluded that salicylic acid improved plant performance under normal and drought conditions and selenate application enriched barley grains, and therefore those treatments are commercially recommended.
Alireza Khaleghi; Rohangiz Naderi; Alireza Salami; Mesbah Babalar; Iman Roohollahi; Gholamreza Khaleghi
Abstract
Drought is one of the most important environmental factors which limit the growth of woody plants. Iran is located in arid and semi-arid area therefore the growth and cultivation of ornamental trees and shrubs were limited. For this purpose, effect of foliar-applied salicylic acid and/or spermidine (0, ...
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Drought is one of the most important environmental factors which limit the growth of woody plants. Iran is located in arid and semi-arid area therefore the growth and cultivation of ornamental trees and shrubs were limited. For this purpose, effect of foliar-applied salicylic acid and/or spermidine (0, 100, 500 and 1000 µmol) on reduce drought stress injuries of one-year seedlings ofOsage orange (Maclura pomifera) was examinedat the Horticultural Research Station, University of Tehran, in 2013.This study was conducted as a factorial based on completely randomized design with three replications. First, PGRs were foliar-applied for two consecutive days in during the early morning and the late afternoon and then plants were droughted by withholding water for 10 days. The damaging effects of drought on membrane leakage were reversed by low concentrations of salicylic acid and/or spermidine. Also, salicylic acid and spermidin at a concentration of 100 µmol stimulated catalase and superoxide dismutase activity, enhanced proline and chlorophyll content and maintained photochemical efficiency of chlorophyllunder drought stress. But Spermidine and salicylic acid at high concentrations were ineffective and/or inhibitors. Finally, our results showed that 100 µmol salicylic acid and/or spermidine maybe the best concentration for increasing of drought tolerance in young seedling, especially during transplanting and planting in permanent location.