Working on Rice-wheat cropping system, Organic rice growing, Weed management in this system, Resource Saving crop production technologies, Dry-seeded rice (DSR), alternate wetting and drying (AWD), Mechanical rice transplanting, Weed biology, Ecology, rice-weed interference, Herbicides, Nutrient, and water management. Planting methods, Oryza Modeling. Rice- Weed Interactions Modeling. , Statistical Tools for Agricultural Research (STAR), GenStat