Conservation of existing irrigation supplies in Pakistan is becoming more and more important as the demand for irrigation water increases and new sources of supply become harder to find. One of the objectives of the Mona Reclamation Experimental Project is to develop new techniques for on-farm water management. This report is part of that program. Currently, much water is wasted by over-irrigation of crops. A large portion of this water could be saved by applying the exact amount of irrigation water required. Since wheat is one of the most important food crops in Pakistan, it was chosen for study. The test site consisted of a one acre field of medium-to-fine-textured, non-saline, non-alkali soil. Final moisture sampling was done at the time of the wheat harvest. The samples were dried in a electric oven at l05 degrees C to constant weight, and the moisture contents were calculated on a dry-weight basis. The consumptive use of water was worked out by two independent methods. The first consisted of gravimetric measurement of soil moisture depletion, in which consumptive use was measured by adding the water loss between soil samplings -- i.e., before and after each irrigation, plus pan evaporation for 3 days after each irrigation, plus rainfall, plus evapotranspiration for the days not otherwise accounted for. The second method measured the total quantity of irrigation water applied during the growth period, plus or minus the difference in soil moisture at sowing and harvest time. The study determined that an appreciable amount of water can be saved, without a loss in production, by using no more than l4 inches of water from irrigation, rainfall, and moisture available in the soil. More complete results, in terms of evapotranspiration, consumptive use, and wheat yield, are also discussed. The authors note that the study is still in progress, so that the findings should be used with caution. The report includes numerous charts and a brief bibliography (l6 references, l957-73).