Authors: Mohamed Naouri, Willemijn Appels, Maik Wolleben
Identifier: CSBE23246
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Published in: CSBE-SCGAB Technical Conferences » AGM Lethbridge 2023

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Description: Variable Rate Irrigation technology (VRI) has the potential to reduce water use in agriculture and increase overall efficiency in water management. Nonetheless, in order to fully leverage its potential, the end-users must have access to irrigation scheduling maps. Using a Pivot-mounted microwave radiometers, Volumetric Water Content (VWC) maps can be created instead of point dataset. While the pivot is moving, the radiometers interpret the microwave emissivity of the top 50 cm of the soil to produce Brightness Temperature (TB) maps. Three microwave radiometers have been mounted on a 70 acres irrigation pivot equipped with a VRI system at the Lethbridge College Demo Farm. The accuracy of the microwave radiometers has been tested under two irrigation treatments (100% and 50% applications) and on three different crops (potato, wheat, and sugar beet). A linear regression model was used to describe the empirical relationship between the TB and the VWC profile at different depths 15, 30 and 50 cm. The VWC profiles were obtained from monitoring stations equipped with fixed moisture sensors and weekly surveys with portable VWC probes. According to the findings, the Radiometer can differentiate between dry and wet plots. However, the estimating the absolute values of VWC requires enhancement. there exists a linear correlation between the TB and VWC with a coefficient of determination of 0.59. The potential of this project is to develop a practical method to create field-scale maps of plant available water by combining observations of VWC with the soil and water retention characteristics of the field.

Keywords: Precision agriculture, Variable rate irrigation, Volumetric water content, Microwave radiometer
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Date: 2023-07-23
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Conference name: CSBE/SCGAB 2023 Annual Conference, Lethbridge, Alberta, 23-26 July 2023.
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Type: Presentation
Publication type: Text.Abstract
Coverage: North_America
Language 1: en
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Rights: Canadian Society for Bioengineering
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