Mehdi Esmaeiltabar; Faezeh Zaefarian; Shahram Nazari; Rahmat Abbasi
Abstract
In order to investigate the effect of different weed control managements on emergence characteristics and morphological growth of rice seedlings in the seedling stage in a direct seeding system, a field experiment has been conducted in the 2020 growing season, Babolsar, Bahnemir, Iran. Being a factorial ...
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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 the seedling stage in a direct seeding system, a field experiment has been conducted in the 2020 growing season, Babolsar, Bahnemir, Iran. Being a factorial in a randomized complete block design with three replications, the experiment employs the following treatments: Shiroudi, Khazar, and Hashemi cultivars as well as various weed control management in five levels of seed coating with calcium chloride, seed coating with potassium chloride, weeding, chemical control, and control. The interaction effect of weed management and cultivar shows that coating the seeds with calcium chloride, potassium chloride, and weeding cuts the dry weight of grasses by 55%, 68%, and 85% in Shiroudi cultivar, by 79%, 63%, and 54% in Khazar cultivar, and 30%, 58%, and 35% in Hashemi cultivar, respectively, compared to the control. The maximum percentage of germination with 99%, 97%, and 95% belong to seed coating with potassium chloride, calcium chloride, and weeding in Shiroudi cultivar, respectively. The highest germination rate could be observed in potassium and calcium chloride seed coating treatments and weeding. The lowest density of broadleaf weeds with 0.91 plants m-2 is obtained in Shiroudi cultivar and by managing the seeds coating of this cultivar with calcium chloride. The highest seedling length and weight vigor indices are obtained with 3559 and 137 in Shiroudi cultivar under weeding management, respectively. Results show that seed coating improves the seed yield of rice cultivars.
Mohammad Khademi; Faezeh Zaefarian; Shahram Nazari; Mohammad Ali Esmaeili
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.