Ecological studies on Echinochloa crus-galli and the implications for weed management in direct-seeded rice

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Productivity and sustainability of the rice-wheat cropping system in the indo-gangetic plains of the Indian subcontinent: Problems, opportunities, and strategies (2012, background): “In other dry DSR studies, reduced crop row spacing increased the crop's ability to compete with weeds for light (Chauhan, 2012; Chauhan and Johnson, 2011b).”
Eco-biology and management of Echinochloa crus-galli (2015, methodology): “Wet rotary cultivation þ puddling þ leveling e Chin (2001) Narrow Spacing þ bispyribac-sodium þ fenoxaprop 10 cm þ 30 g ha 1 þ 86.”
Rice–wheat cropping systems in South Asia: issues, options and opportunities (2019, background): “Mahajan and Chauhan (2011) observed that a paired-row planting pattern (15-, 30-, 15-cm row-to-row spacing) in dry DSAR influenced weeds more than a normal row planting system (23-cm row-to-row spacing).”