Abstract
A field study was conducted in the boro season of 2011-12 and aman season of 2012 at Jessore, Bangladesh, to evaluate the performance of sequential applications of preemergence herbicides (oxadiargyl 80 g ai ha−1, pendimethalin 850 g ai ha−1, acetachlor + bensulfuranmethyl 240 g ai ha−1, and pyrazosulfuron 15 g ai ha−1) followed by a postemergence herbicide (ethoxysulfuron 18 g ai ha−1) in dry-seeded rice. All evaluated herbicides reduced weed density and biomass by a significant amount. Among herbicides, pendimethalin, oxadiargyl, and acetachlor + bensulfuranmethyl performed very well against grasses; pyrazosulfuron, on the other hand, was not effective. The best herbicide for broadleaf weed control was oxadiargyl (65–85% control); pendimethalin and acetachlor + bensulfuraonmethyl were not effective for this purpose. The best combination for weed control was oxadiargyl followed by ethoxysulfuron in the boro season and oxadiargyl followed by a one-time hand weeding in the aman season. Compared with the partial weedy plots (hand weeded once), oxadiargyl followed by ethoxysulfuron (4.13 t ha−1) provided a 62% higher yield in the boro season while oxadiargyl followed by a one-time hand weeding (4.08 t ha−1) provided a 37% higher yield in the aman season.
Highlights
In many Asian countries, growers recently started to shift their rice cultivation practices from the traditional puddledtransplanted rice (PTR) to dry-seeded rice (DSR)
The best combination for weed control was oxadiargyl followed by ethoxysulfuron in the boro season and oxadiargyl followed by a one-time hand weeding in the aman season
Compared with the partial weedy plots, oxadiargyl followed by ethoxysulfuron (4.13 t ha−1) provided a 62% higher yield in the boro season while oxadiargyl followed by a one-time hand weeding (4.08 t ha−1) provided a 37% higher yield in the aman season
Summary
In many Asian countries, growers recently started to shift their rice cultivation practices from the traditional puddledtransplanted rice (PTR) to dry-seeded rice (DSR). The development of alternative methods that are more water-efficient and less labor-intensive is important to enable farmers to produce more with less cost. These factors demand a major shift from PTR production to dry seeding of rice in irrigated areas. Chemical methods of weed control are the most practical and cost-efficient [8, 13].Several preemergence (e.g., pendimethalin, oxadiazon, oxdiargyl, and pyrazosulfuron) and postemergence herbicides (e.g., bispyribac-sodium, azimsulfuron, penoxsulam, fenoxaprop, ethoxysulfuron, and 2,4-D) are available in various Asian countries and have been reported to provide effective weed control [11]. This study was conducted to evaluate the performance of sequential applications of various preemergence herbicides followed by postemergence herbicides in DSR—the first was study conducted in Bangladesh for this purpose
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