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Soil Water Content Data for The Bushland, Texas Large Weighing Lysimeter Experiments

Published by Agricultural Research Service | Department of Agriculture | Metadata Last Checked: January 27, 2026 | Last Modified: 2025-11-21
This dataset contains soil water content data developed from neutron probe readings taken in access tubes in each of the four large, precision weighing lysimeters and in the fields surrounding each lysimeter at the USDA-ARS Conservation and Production Laboratory (CPRL), Soil and Water Management Research Unit (SWMRU), Bushland, Texas (Lat. 35.186714°, Long. -102.094189°, elevation 1170 m above MSL) beginning in 1989. Readings were taken periodically with a field-calibrated neutron probe at depths from 10 cm to 230 cm (maximum of 190 cm depth in the lysimeters) in 20-cm depth increments. Periods between readings were typically one to two weeks, sometimes longer according to experimental design and need for data. Field calibrations in the Pullman soil series were done every few years. Calibrations typically produced a regression equation with RMSE <= 0.01 m3 m-3. Data were used to guide irrigation scheduling to achieve full or deficit irrigation as required by the experimental design. Data may be used to calculate the soil profile water content in mm of water from the surface to the maximum depth of reading. Profile water content differences between reading times in the same access tube are considered the change in soil water storage during the period in question and may be used to compute evapotranspiration (ET) using the soil water balance equation: ET = (change in storage + P + I + F + R, where P is precipitation during the period, I is irrigation during the period, F is soil water flux (drainage) out of the bottom of the soil profile during the period, and R is the sum of runon and runoff during the period. Typically, R is taken as zero because the fields were furrow diked to prevent runon and runoff during most of each growing season. See the README for descriptions of each data file.

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Complete Metadata
@type dcat:Dataset
accessLevel public
accrualPeriodicity irregular
bureauCode 
                                            [
  "005:18"
]
contactPoint 
                                            {
  "fn": "Evett, Steven R.",
  "hasEmail": "mailto:steve.evett@usda.gov"
}
description <p>This dataset contains soil water content data developed from neutron probe readings taken in access tubes in each of the four large, precision weighing lysimeters and in the fields surrounding each lysimeter at the USDA-ARS Conservation and Production Laboratory (CPRL), Soil and Water Management Research Unit (SWMRU), Bushland, Texas (Lat. 35.186714°, Long. -102.094189°, elevation 1170 m above MSL) beginning in 1989. Readings were taken periodically with a field-calibrated neutron probe at depths from 10 cm to 230 cm (maximum of 190 cm depth in the lysimeters) in 20-cm depth increments. Periods between readings were typically one to two weeks, sometimes longer according to experimental design and need for data. Field calibrations in the Pullman soil series were done every few years. Calibrations typically produced a regression equation with RMSE <= 0.01 m<sup>3</sup> m<sup>-3</sup>. Data were used to guide irrigation scheduling to achieve full or deficit irrigation as required by the experimental design. Data may be used to calculate the soil profile water content in mm of water from the surface to the maximum depth of reading. Profile water content differences between reading times in the same access tube are considered the change in soil water storage during the period in question and may be used to compute evapotranspiration (ET) using the soil water balance equation: ET = (change in storage + P + I + F + R, where P is precipitation during the period, I is irrigation during the period, F is soil water flux (drainage) out of the bottom of the soil profile during the period, and R is the sum of runon and runoff during the period. Typically, R is taken as zero because the fields were furrow diked to prevent runon and runoff during most of each growing season.</p> <p>See the README for descriptions of each data file.</p>
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]
identifier 10.15482/USDA.ADC/1526332
keyword 
                                            [
  "ARS",
  "Agroecosystems & Environment Soil",
  "Agroecosystems & Environment Water",
  "Evapotranspiration",
  "NP211",
  "data.gov"
]
license https://creativecommons.org/publicdomain/zero/1.0/
modified 2025-11-21
programCode 
                                            [
  "005:040"
]
publisher 
                                            {
  "name": "Agricultural Research Service",
  "@type": "org:Organization"
}
spatial 
                                            "{"type": "Polygon", "coordinates": [[[-102.09906463948, 35.191719970106], [-102.07671433134, 35.19121493622], [-102.07678299485, 35.1865853205], [-102.07609634934, 35.177044674547], [-102.09913330298, 35.177072738625], [-102.09906463948, 35.191719970106]]]}"
temporal 1989-01-01/1989-01-01
title Soil Water Content Data for The Bushland, Texas Large Weighing Lysimeter Experiments

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