Field trials were carried out to study the effect of irrigation, phosphorus and weed control methods on weeds and field pea during winter seasons of 1986–87 and 1987–68 at Haryana Agricultural University, Hisar, India. Different irrigation and phosphorus levels had very little or no effect on the population and dry weight. Different weed control methods resulted in significantly lower population and weight of weeds as compared to unweeded at all the observation stages. The grain yield of field pea was significantly increased by irrigation, phosphorus and weed control levels. Irrigation at flowering or flowering + pod formation stages and application of 40 or 80 kg P2O5/ha produced 20–40% higher grain yield to that of no irrigation and no phosphorus. Weed‐free conditions registered 81% and 105% higher yield than unweeded during 1987 and 1988, respectively. Hand‐weeded twice at 30 + 60 d.a.s. or pendimethaline at 1.0 kg/ha increased the yields by 40–50% over weedy check.