Abstract
The present study was carried out at Regional Research Station, CCS Haryana Agricultural University, Karnal, Haryana during winter (rabi) seasons of 2019–20 and 2020–21. In this experiment, ZT-wheat (Triticum aestivum L.) was sown with happy seeder under surface residue load of 6 t/ha (chopped). Fourteen weed control treatments including pre-emergence herbicide (pendimethalin 1500 g/ha), sequential application of pre-emergence fb post-emergence (POE) herbicide (pendimethalin 1500 g/ha fb pinoxaden 50 g/ha), weedy check and weed-free were applied in a randomised block design (RBD) with 3 replications. Pre-emergence (PRE) herbicides were applied on the top of rice (Oryza sativa L.) residues using two water volumes (500 and 1000 litre/ha) with 3 types of nozzles (flat-fan, flood-jet and air-injection). Among weed species, Rumex dentatus (L.) and Phalaris minor (Retz.) showed significantly higher suppression under residue mulch and Medicago polymorpha (L). showed least suppression. Pendimethalin 1500 g/ha fb pinoxaden 50 g/ha (1000 l/ha) (Flood-jet) was statistically similar to weed-free in terms of grain yield, net returns and B:C ratio during both the years.
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