Comparison Between Direct-seeding and Transplanting of Rice in Mazandaran Province: Weed Competition, Yield and Yield Components

پژوهشهای زراعی ایران

Article 8, Volume 12, Issue 3 - Serial Number 35, October 2014, Pages 463-475   

Document Type: Research Article

DOI: 10.22067/gsc.v12i3.22637

Authors

A Ala¹; M AghaAlikhani^{* 1}; B Amiri Larijani²; S Soufizadeh¹

¹Tarbiat Modares University

²Tarbiat Modares University

Abstract

In order to investigate rice competition ability against weeds in direct-seeding and transplanting systems afield experiment was conducted at Mahmud Abad region of Mazandaran province on 2011 growing season. Experimental treatments were studied in a split plot factorial design based on randomized complete blocks with three replicates. Direct-seeding and transplanting of rice in wet seedbed were the main plots and three rice cultivars under two weed management systems (weed free and weed infested) were arranged in sub plots. Results showed there was no significant yield difference in both system of rice planting under weed free condition, but yield loss due to weed interference in direct-seeding and transplanting of rice were 66% and 14% respectively.Line 843 which showed high competition ability in transplanting of rice, encountered with low ability due to weed pressure derivedweek early vigor but our traditional cultivar (Tarom Deilamani) has acceptable competition ability and better yield sustainabilitythan improved cultivar (Khazar) and line 843 in direct seeding system. Cultivars competitiveness could be attributed to more height, higher growth rate in early season, panicle number and higher dry weight of rice. Also in direct seeding related traits to the early vigor was more important than others. Results revealed that direct seeding integrated with weed control could be a good strategy for reducing costs of rice production. In such a system seedling early growth has important role in weed suppression.

Keywords

Competition ability; Earlygrowth rate; Rice; Weed; Yield loss

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