Mehdi Esmaeiltabar; Faezeh Zaefarian; Shahram Nazari; Rahmat Abbasi
Articles in Press, Accepted Manuscript, Available Online from 10 July 2021
Abstract
In order to investigate the effect of different weed control managements on emergence characteristics and morphological growth of rice seedlings in seedling stage in direct seeding system, an experiment was conducted in 2020 growing season. The experiment was performed as a factorial in a randomized ...
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In order to investigate the effect of different weed control managements on emergence characteristics and morphological growth of rice seedlings in seedling stage in direct seeding system, an experiment was conducted in 2020 growing season. The experiment was performed as a factorial in a randomized complete block design with three replications. Factors included Shiroudi, Khazar and Hashemi cultivars as well as various weed control managements. Coating the seeds with calcium chloride, potassium chloride and weeding were able to reduce the dry weight of grasses, respectively 54.60, 68.02 and 84.68% in Shiroudi cultivar, 78.53, 62.94 and 53.53% in Khazar cultivar and also 29.67, 57.86% and 34.71% in Hashemi cultivar compared to the control. The highest percentage of germination with 99.33, 97.67 and 94.67% was obtained under the seed coatings with potassium chloride, calcium chloride and weeding in Shiroudi cultivar, respectively. The highest germination rate was observed in potassium and calcium chloride seed coating treatments and weeding. The lowest density of broadleaf weeds with 0.91 plants m-2 was obtained in Shiroudi cultivar and by managing the seeds coating of this cultivar with calcium chloride. The highest seedling length and weight vigor indices were obtained with 3559 and 1362.62 in Shiroudi cultivar under weeding management, respectively. The results showed that seed coating improves the seed yield of rice cultivars.
Mohammad Khademi; Faezeh Zaefarian; Shahram Nazari; Mohammad Ali Esmaeili
Volume 23, Issue 2 , Spring 2021, , Pages 307-319
Abstract
To investigate the effect of seed priming on emergence characteristics, root morphological growth, and phenological trends of rice in direct seeding, an experiment has been conducted in Sari Agricultural Sciences and Natural Resources University within 2019. The study is conducted as factorial in a randomized ...
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To investigate the effect of seed priming on emergence characteristics, root morphological growth, and phenological trends of rice in direct seeding, an experiment has been conducted in Sari Agricultural Sciences and Natural Resources University within 2019. The study is conducted as factorial in a randomized complete block design with three replications. The factors include Tarom Hashemi and Shiroudi cultivars and priming at five levels, namely hydropriming (for 48 hours), calcium chloride, and potassium chloride priming (Ψs -1.25 MPa), ascorbate acid (10 mg l-1), and control (no priming). The effect of priming on emergence percentage shows that the highest amount of this trait belongs to 90% in priming with calcium chloride, which is not significantly different from priming with potassium chloride and water. The rate of emergence of priming with calcium chloride, potassium chloride, and water has increased by 50%, 36%, and 29%, respectively. Results show that priming with calcium chloride, potassium chloride, ascorbate acid, and water has increased by 55%, 50%, 33%, and 38% of the plant height and by 48%, 29%, 12%, and 25% of plant dry weight, respectively. In Shiroudi and Tarom Hashemi cultivars, the time required for the onset of tillering has been 27.40 and 24.53 days; panicle appearance, 90.4 and 53.87 days; flowering, 100.53 and 70.87 days; and maturity 132.26 and 94.61 days, respectively. The least time required for panicle appearance and flowering is observed in priming with calcium chloride, although this has not been significantly different from other priming, and decreased by 11.17 and 7.5 days to the control, respectively.