Soil Water Content Data for The Bushland, Texas, Winter Wheat Experiments

<p>[NOTE - 2022-09-07: this dataset is superseded by an updated version <a href="https://doi.org/10.15482/USDA.ADC/1526332">https://doi.org/10.15482/USDA.ADC/1526332</a> ]</p>
<p>This dataset contains soil water content data developed from neutron probe readings taken in access tubes in two of the four large, precision weighing lysimeters and in the fields surrounding each lysimeter that were planted to winter wheat 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. Data in each spreadsheet are for one winter wheat growing season, either 1989-1990, 1991-1992, or 1992-1993. Other readings taken in those years for other crops are reported elsewhere. Data for the 1989-1990 season and the 1992-1993 season are from the northwest (NW) and southwest (SW) weighing lysimeters and surrounding fields. Data for the 1991-1992 season are from the northeast (NE) and southeast (SE) weighing lysimeters and surrounding fields. 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> (e.g., Evett and Steiner, 1995). 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><div><br>Resources in this dataset:</div><br><ul><li><p>Resource Title: 1989-90 Bushland, TX, west winter wheat volumetric soil water content data.</p> <p>File Name: 1989-90_West_Winter-Wheat_Soil-water.xlsx</p><p>Resource Description: Contains periodic volumetric soil water content data from neutron probe readings in 20-cm depth increments from 10-cm depth to 230-cm depth in access tubes in fields around the Bushland, TX, northwest (NW) and southwest (SW) large, precision weighing lysimeters, and to 190-cm depth in each lysimeter. The excel file contains a data dictionary for each tab containing data. There is also a tab named Introduction that lists the authors, equipment used, relevant citations, and explains the other tabs, which contain either data dictionaries, data, geographical coordinates of access tube locations, or data visualization tools. Tab names are unique so that tabs may be saved as individual CSV files.</p></li><br><li><p>Resource Title: 1991-92 Bushland, TX, east winter wheat volumetric soil water content data.</p> <p>File Name: 1991-92_East_Winter-Wheat_Soil-water.xlsx</p><p>Resource Description: Contains periodic volumetric soil water content data from neutron probe readings in 20-cm depth increments from 10-cm depth to 230-cm depth in access tubes in fields around the Bushland, TX, large, northeast (NE) and southeast (SE) precision weighing lysimeters, and to 190-cm depth in each lysimeter. The excel file contains a data dictionary for each tab containing data. There is also a tab named Introduction that lists the authors, equipment used, relevant citations, and explains the other tabs, which contain either data dictionaries, data, geographical coordinates of access tube locations, or data visualization tools. Tab names are unique so that tabs may be saved as individual CSV files.</p></li><br><li><p>Resource Title: 1992-93 Bushland, TX, west winter wheat volumetric soil water content data.</p> <p>File Name: 1992-93_West_Winter-Wheat_Soil-water.xlsx</p><p>Resource Description: Contains periodic volumetric soil water content data from neutron probe readings in 20-cm depth increments from 10-cm depth to 230-cm depth in access tubes in fields around the Bushland, TX, northwest (NW) and southwest (SW) large, precision weighing lysimeters, and to 190-cm depth in each lysimeter. The excel file contains a data dictionary for each tab containing data. There is also a tab named Introduction that lists the authors, equipment used, relevant citations, and explains the other tabs, which contain either data dictionaries, data, geographical coordinates of access tube locations, or data visualization tools. Tab names are unique so that tabs may be saved as individual CSV files.</p></li></ul><p></p>

Tags: agroecosystems-environment-soil, agroecosystems-environment-water, ars, data-gov, evapotranspiration, np211, soil-water-content
Organization: Department of Agriculture