Effects of Seed Rate on Yield and Weed Control of Different Rice Cultivars in Direct-Seeded Conditions

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Document Type : Research Paper

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1 university

2 Assist. Prof., Dept. of Plant Production and Genetics, Faculty of Agriculture, Agricultural Sciences and Natural Resources University of Khuzestan

3 Assistant Professor Department of Plant Production and Genetics, Faculty of Agriculture, Khuzestan Agricultural Sciences and Natural Resources University, Khuzestan, Iran

Abstract

In order to evaluate the effect of seed rates in different rice cultivars, an experiment was conducted factorial arrangement based on randomized complete block design (RCBD) with three replications in 2021 in the Shosh minaab (Khuzestan province). The first factor included four seed rates (90, 120, 150, and 180 kg/ha), the second factor comprised three rice cultivars (Anberbo, Sherodi, and Zighami), and the third factor was herbicide treatment (application of Bispyribac-sodium herbicide and no herbicide application). With increasing the seed rate led to a decrease in the total biomass of weeds. Under conditions of herbicide application and a seed rate of 180 kg/ha, the lowest weed biomass was recorded (56 g/m2). Conversely, with a seed rate of 90 kg/ha and no herbicide application, the highest biomass was observed (296 g/m2). The total biomass of weeds was also lower in sherodi than in zighami and Anberbo. The grain yield results also indicated that the Sherodi cultivar had the highest grain yield (4351 kg/ha) under herbicide application, while the Anbarbo cultivar had the lowest grain yield (755 kg/ha) under no herbicide conditions. The grain yield of the Sherodi cultivar in the seed rate treatments of 150 and 180 kg/ha was the highest compared to the other cultivars, with yields of 3658 and 3440 kg/ha, respectively. In order to achieve the desired yield and reduce the dry weight of weeds, it is recommended to use the Sherodi cultivar and a seed rate of 150 kg/ha

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JOURNAL OF AGRICULTURAL SCIENCE AND SUSTAINABLE PRODUCTION

Articles in Press, Accepted Manuscript
Available Online from 22 July 2025

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