Standardization of spray technique for pre-emergence herbicides in ZT-wheat (Triticum aestivum) with surface residue cover

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