IRRIGATION SCHEDULING
Ground truthing and verification
Irrigation scheduling apps often use models that are based on limited available data and limited research. It is important to remember that while apps can be useful in integrating information, their outputs need to be verified (ground-truthed) against the crop in the field. If the app simulates the crop growth (based on days or heat units, for instance), does the simulated crop match the crop in the field? If the app provides soil water estimates, do the simulated values match the field-observed soil water? Do the model’s crop water use estimates or soil water estimates make sense, based on soil physical characteristics, soil depth and crop characteristics? If not, can the discrepancy be attributed to field conditions or input data errors, or is the app not applicable to your field or crop conditions?
Ideally, irrigation scheduling apps aim to be intuitive, convenient and useful in irrigation management decisions.
Technical assistance or user support
Ideally, irrigation scheduling apps aim to be intuitive, convenient and useful in irrigation management decisions. Sometimes users can benefit from technical support, training and other support references. Conversely, users can be helpful in identifying problems or providing feedback useful for app improvement. Technical support contacts familiar with the app design, functionality, background models and assumptions can be valuable. Active support and updates are key to longevity and applicability of irrigation scheduling apps.
Dana Porter, PhD, PE extension agricultural engineering specialist – agricultural water management and extension and agricultural engineering, Texas A&M program emphasizes agricultural irrigation limited conditions.
Thomas Marek, MS, PE, is a senior Research, Amarillo/Bushland, Texas. He has extensive applied research experience in evapotranspiration, crop water use and crop water management.
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irrigationtoday.org Summer 2022 | Irrigation TODAY 27
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