Introduction Measuring soil-water is important to effective irrigation scheduling.
Manufacturers of most soil-water measuring devices provide a calibration curvefor their equipment. However, manufacturer's calibration curves are developedfor general conditions and are not adequate for site-specific soil conditions. For best results, soil-water measuring devices should be calibrated for the major soil types in each field being irrigated. It is important to calibrate each different type of equipment for each major soil where it will be used. Usually, it is not necessary to calibrate all of the devices of a similar type if the equipment comes from the same manufacturer, is used in the same field, and seems to be functioning properly.