Irrigation has increased in importance in Northeast Louisiana and other areas of the Mid-South. Although several methods of irrigation scheduling are available, there is a lack of local data on daily crop water use, a drawback for soil water-balance scheduling methods. Two lysimeters were built and installed in a sharkey clay soil at the Northeast Research Station, Saint Joseph. This equipment will permit the measurement of crop water use, and its comparison with weather data will allow the development of crop coefficients based on the Penman-Monteith equation.