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Uncertainty, calibration and validation of the Mississippi Irrigation Scheduling Tool model

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131620221,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   R. Prabhu, N. Lee, M. C. Wadsworth, G.F. Sassenrath, A.M. Schmidt, J. Crumpton, B. Rice, H. van Riessen, R. Thornton, J. Pote, C. Wax
Keywords:   Irrigation Schedule Modeling Uncertainty Analysis Water Balance Web-Based Application

Abstract. The current work presents the uncertainty analysis and its results of the Mississippi Irrigation Scheduling Tool (MIST) model, showing the margin of error (uncertainty) of the irrigation advice obtained through the web-based application. The basis for the verification and validation of the model is also given. The MIST calculates the daily soil water balance in a crop field from daily weather measurements, irrigation, and rainfall, taking into account crop type, planting date, soil type, tillage, and other field-specific information. The MIST water balance calculations were validated using the local weather data that consisted of a few days of rain, and significant changes in the solar radiation, relative humidity and wind speed. The final water balance results showed values within acceptable ranges and comparable to in situ measurements of soil moisture. The final relative uncertainty in the water balance value was around 9%, which is in the normal range of the margin of error. The current MIST web-based application and uncertainty quantification have been preliminarily verified and validated. Further, the sensitivity analysis of the model reveal that net radiation on the crop surface, temperature and net evapotranspiration play a role in the evapotranspiration of water, specifically on the day of rainfall and the following day.

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