Abstract
Remote sensing of soil-water content is, at present, limited to the top few centimeters of soil. During a diurnal cycle the near-surface water content undergoes rather wide diurnal fluctuations. Data from five experiments on Avondale loam at Phoenix, Arizona, at various times of the year demonstrated that soil samples taken between 1100 and 1200 hours (MST) best represented the 24 hour average soil-water content. Also, the average of the daily maximum and minimum water contents closely approximated the 24 hour average. The data showed that time of sampling was an important criterion when obtaining ground truth in remote sensing of soil-water content.
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