Theses and Dissertations
ORCID
https://orcid.org/0009-0006-4333-5128
Issuing Body
Mississippi State University
Advisor
Wijewardane, Nuwan K.
Committee Member
Cox, Michael S.
Committee Member
Zhang, Xin
Date of Degree
12-8-2023
Original embargo terms
Embargo 6 Months
Document Type
Graduate Thesis - Open Access
Major
Engineering Technology
Degree Name
Master of Science (M.S.)
College
College of Agriculture and Life Sciences
Department
Department of Agricultural and Biological Engineering
Abstract
Instrumental disparities and soil moisture are two of the key limitations in implementing spectroscopic techniques in the field. This study sought to address these challenges through two objectives. The first objective was to assess Visible-near infrared (VisNIR) and mid-infrared (MIR) spectroscopic approaches and explore the feasibility of transferring calibration models between laboratory and portable spectrometers. The second objective addressed the challenge of soil moisture and its impact on spectra. The portable spectrometers demonstrated comparable performance to their laboratory-based counterparts in both regions. Spiking with extra-weight, was the most effective calibration transfer method eliminating disparities between instruments. The samples were rewetted under nine controlled conditions for the moisture study. Results showed that spiking with extra weights significantly outperformed other techniques and model enhancement was insensitive to the moisture contents. Findings of this study will be helpful for development and deployment of in situ sensors to enable field implementation of spectroscopy.
Recommended Citation
Silva, Francis Hettige Chamika Anuradha, "Moisture effects on visible near-infrared and mid-infrared soil spectra and strategies to mitigate the impact for predictive modeling" (2023). Theses and Dissertations. 6054.
https://scholarsjunction.msstate.edu/td/6054
Included in
Agricultural Science Commons, Agriculture Commons, Biology and Biomimetic Materials Commons, Chemical Engineering Commons, Engineering Science and Materials Commons, Research Methods in Life Sciences Commons