Articles

Managing weeds using sequential herbicides in maize for improving crop growth and productivity under irrigated conditions in North-Western India


Abstract


Field experiments were conducted in Kharif 2015 and 2016 at the research farm, ICAR-Indian Agricultural Research
Institute, New Delhi to determine the effect of different pre- and post-emergence herbicide applications on weed dynamics in maize (Zea mays L.). The investigation had a combination of eleven treatments using atrazine, pendimethalin, halosulfuron and tembotrione herbicides at different doses with different methods of application.
One hand weeding (manual) treatment was kept as standard check and weedy check as control. Chemical weed control and weed free treatment recorded lower weed dry matter compared to weedy check. Highest leaf area was recorded in weed free treatment which was statistically at par with foliar application of halosulfuron @ 90 g/ha + tembotrione @ 120 g a.i./ha [30 days after sowing (DAS)] as tank mix] and pendimethalin @ 1.0 kg a.i./ha (pre-em) + residue @ 2.5 t/ha but significantly higher than weedy check. Highest cob length (18.07 cm) was recorded in weed free which was significantly higher than other treatments except endimethalin @ 1.0 kg a.i./ha (pre-em) + residue @ 2.5 t/ha. A significant increase in 100-seed weight and bundle weight was recorded in weed free treatment and all the other chemical treatments relative to weedy check for both the years and significantly higher grain yield was recorded in weed free and chemical treatments {halosulfuron @ 90 g/ha + tembotrione @ 120 g a.i./ha (30 DAS as tank mix) or halosulfuron @ 90 g/ha fb tembotrione @ 120 g a.i./ha (post em)} relative to weedy check. During both the years, highest yield loss relative to weed free was recorded in weedy check (52.88 %). During both the years, weed free and chemical treatments like halosulfuron @ 90 g/ha + tembotrione @ 120 g a.i./ha (30 DAS as tank mix) recorded significantly lower weed density, weed dry matter and weed index than weedy check. Significantly higher weed control efficiency was recorded in weed free (manual) and with application of atrazine @ 0.75 kg a.i./ha + pendimethalin @ 0.75 kg a.i./ha (PE) during both the years. Herbicide application treatments like halosulfuron @ 90 g/ha + tembotrione @ 120 g a.i./ha (30 DAS as tank mix) resulted in highest weed control index relative to weedy check.


Keywords

Zea mays L., Grain yield, Growth, Herbicide, Weed control efficiency

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013