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SPATIAL AND TEMPORAL PATTERNS OF WATER CONTENT IN DRYLAND CROP PRODUCTION IN THE PALOUSE

Citation

Wessel, Meghan Jane. (2014). SPATIAL AND TEMPORAL PATTERNS OF WATER CONTENT IN DRYLAND CROP PRODUCTION IN THE PALOUSE. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/wessel_idaho_0089m_10214.html

Title:
SPATIAL AND TEMPORAL PATTERNS OF WATER CONTENT IN DRYLAND CROP PRODUCTION IN THE PALOUSE
Author:
Wessel, Meghan Jane
Date:
2014
Keywords:
Crop Rotation Electromagnetic Induction Palouse Tillage Water Winter Wheat
Program:
Plant, Soil and Entomological Sciences
Subject Category:
Soil sciences; Water resources management; Agriculture
Abstract:

Common methods for measuring soil moisture disturb the soil and do not represent large areas with varying topography. We estimated volumetric water content (VWC) using apparent electrical conductivity (ECa) while comparing chisel plow tillage and no-till as well as crop rotations on a split-plot design. Weekly measurements of ECa were converted to VWC using multiple linear regression (r = 0.89, p = 0.0) with the additional variables growing degree days, elevation, clay content, and silt content using a principal component analysis. VWC and ECa were well correlated (r = 0.60, p = 2.2x10-12); with a similar percent decrease from April to October. Spring peas retained the highest predicted VWC, followed by spring barley and winter wheat. The spatial and temporal maps of moisture content provided a comprehensive view of the amount, location, and timing of volumetric water content as a function of agronomic management practices.

Description:
masters, M.S., Plant, Soil and Entomological Sciences -- University of Idaho - College of Graduate Studies, 2014
Major Professor:
Heinse, Robert
Committee:
Johnson-Maynard, Jodi; Huggins, David
Defense Date:
2014
Identifier:
Wessel_idaho_0089M_10214
Type:
Text
Format Original:
PDF
Format:
application/pdf

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