| Autor: |
Steven R. Evett, Gary W. Marek, Paul D. Colaizzi, Karen S. Copeland, Brice B. Ruthardt |
| Jazyk: |
angličtina |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Vadose Zone Journal, Vol 21, Iss 6, Pp n/a-n/a (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1539-1663 |
| DOI: |
10.1002/vzj2.20235 |
| Popis: |
Abstract Downhole soil volumetric water content (VWC) sensors are used in access tubes to assess the soil water content at multiple depths. If sensor readings are spaced closely enough vertically and are accurate enough, then accurate soil profile water content storage and change in storage can be determined over the depth range of readings, leading to accurate estimates of evapotranspiration (ET) if readings extend to well below the root zone. Even if sensing only covers the active root zone, soil water depletion may be determined well enough to inform irrigation scheduling. While sensor accuracy is dependent on many factors, including the sensor's physical principle of operation, soil‐specific calibration is typically required for good accuracy. In soils with multiple horizons (layers) of different texture, bulk density (BD), or chemical composition, horizon‐specific calibrations may be necessary. We describe methods and equipment used for downhole sensor calibration to typical accuracy of |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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