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

Weeds that occur in repeated flushes pose major challenges to direct-seeded rice (DSR). Zero till (ZT) DSRwith crop residue influences weed interference considerably and can be substitutive resource-intensive puddledtransplanted (PTR). Field experiments were conducted at ICAR-Indian Agricultural Research Institute during2018–19 involving conservation agriculture (CA)-based DSRs control/herbicides treatments appraiseweed productivity under an eight-year old CA-based rice-wheat system (RWS). All encountered more weeds than PTR. A double ZT without [~ZTDSR-ZT wheat (ZTW); C1] had highest density dry weight of grassy weeds, but a triple [~ZTDSR-ZTW-ZT mungbean (ZTMB);C4] broad-leaved sedge weeds. However, with threecrops [~ZTDSR + residue-ZTW residue-ZTMB residue; C5)] could reduce weedinterference significantly led 9.3% 21.8% higher yield C1 C4, respectively. The applicationof pyrazosulfuron-ethyl 0.025 kg/ha pre-emergence followed by (fb) cyhalofop-butyl 0.100 20 days aftersowing (DAS), fb bispyribac-Na 25 DAS (W4) significant reduction grassy, andsedge densities 92.5, 96.6 67.7%, rice, mungbeanresidues (C5) combined application gavealmost similar PTR (C6). This may recommended for adoption Indo-Gangetic Plains (IGP) ofIndia agro-ecologies the tropics/sub-tropics.