Weed management in direct-seeded rice under a long-term conservation agriculture-based rice (Oryza sativa)-wheat (Triticum aestivum) system

RISHI RAJ; T K DAS; PANKAJ; A GHOSH; RANJAN BHATTACHARYYA; DEBASHIS CHAKRABORTY; SHIV PRASAD; TIRTHANKAR BANERJEE; VIKASH KUMAR; SUMAN SEN; SONAKA GHOSH; ARKAPRAVA ROY; NEELMANI RATHI

doi:10.56093/ijas.v92i7.116246

Authors

RISHI RAJ Indian Agricultural Research Institute, New Delhi
T K DAS Indian Agricultural Research Institute, New Delhi
PANKAJ Indian Agricultural Research Institute, New Delhi
A GHOSH Indian Agricultural Research Institute, New Delhi
RANJAN BHATTACHARYYA Indian Agricultural Research Institute, New Delhi
DEBASHIS CHAKRABORTY Indian Agricultural Research Institute, New Delhi
SHIV PRASAD Indian Agricultural Research Institute, New Delhi
TIRTHANKAR BANERJEE Indian Agricultural Research Institute, New Delhi
VIKASH KUMAR Agricultural Research Station, SDAU, Ladol, Mehsana, Gujarat, India
SUMAN SEN Indian Agricultural Research Institute, New Delhi
SONAKA GHOSH ICAR-Research Complex for Eastern Region, Patna, Bihar
ARKAPRAVA ROY Indian Agricultural Research Institute, New Delhi
NEELMANI RATHI Indian Agricultural Research Institute, New Delhi

https://doi.org/10.56093/ijas.v92i7.116246

Keywords:

Bispyribac-Na, Crop residue, Cyhalofop-butyl, Pendimethalin, Pyrazosulfuron-ethyl, Sesbania brown manuring, Weeds

Abstract

Weeds that occur in repeated flushes pose major challenges to direct-seeded rice (DSR). Zero till (ZT) DSR
with crop residue influences weed interference considerably and can be substitutive to resource-intensive puddled
transplanted rice (PTR). Field experiments were conducted at ICAR-Indian Agricultural Research Institute during
2018–19 involving conservation agriculture (CA)-based DSRs and weed control/herbicides treatments to appraise
weed interference and productivity under an eight-year old CA-based rice-wheat system (RWS). All DSRs encountered more weeds than PTR. A double ZT system without residue [~ZTDSR-ZT wheat (ZTW); C1] had highest density and dry weight of grassy weeds, but a triple ZT system without residue [~ZTDSR-ZTW-ZT mungbean (ZTMB);
C4] had highest density and dry weight of broad-leaved and sedge weeds. However, a triple ZT system with three
crops residue [~ZTDSR + mungbean residue-ZTW + rice residue-ZTMB + wheat residue; C5)] could reduce weed
interference significantly and led to 9.3% and 21.8% higher rice yield than C1 and C4, respectively. The application
of pyrazosulfuron-ethyl 0.025 kg/ha pre-emergence followed by (fb) cyhalofop-butyl 0.100 kg/ha at 20 days after
sowing (DAS), fb bispyribac-Na 0.025 kg/ha at 25 DAS (W4) led to significant reduction in grassy, broad-leaved and
sedge weeds densities by 92.5, 96.6 and 67.7%, respectively. The triple ZT system with rice, wheat and mungbean
residues (C5) combined with application of pyrazosulfuron-ethyl fb cyhalofop-butyl fb bispyribac-Na (W4) gave
almost similar rice yield with PTR (C6). This may be recommended for adoption in Indo-Gangetic Plains (IGP) of
India and in similar agro-ecologies of the tropics/sub-tropics.

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Author Biography

T K DAS, Indian Agricultural Research Institute, New Delhi

Division of Agronomy, IARI, New Delhi - 110 012, Principal Scientist

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