{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T19:36:34Z","timestamp":1773948994778,"version":"3.50.1"},"reference-count":22,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2011,10,21]],"date-time":"2011-10-21T00:00:00Z","timestamp":1319155200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Developing soil sensors with the possibility of continuous online measurement is a major challenge in soil science. Terahertz (THz) electromagnetic radiation may provide the opportunity for the measurement of organic material density, water content and other soil parameters at different soil depths. Penetration depth and information content is important for a functional soil sensor. Therefore, we present initial research on the analysis of absorption coefficients of four different soil samples by means of THz transmission measurements. An optimized soil sample holder to determine absorption coefficients was used. This setup improves data acquisition because interface reflections can be neglected. Frequencies of 340 GHz to 360 GHz and 1.627 THz to 2.523 THz provided information about an existing frequency dependency. The results demonstrate the potential of this THz approach for both soil analysis and imaging of buried objects. Therefore, the THz approach allows different soil samples to be distinguished according to their different absorption properties so that relations among soil parameters may be established in future.<\/jats:p>","DOI":"10.3390\/s111009973","type":"journal-article","created":{"date-parts":[[2011,10,21]],"date-time":"2011-10-21T11:37:59Z","timestamp":1319197079000},"page":"9973-9988","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Application of Terahertz Radiation to Soil Measurements: Initial Results"],"prefix":"10.3390","volume":"11","author":[{"given":"Volker","family":"Dworak","sequence":"first","affiliation":[{"name":"Department Engineering for Crop Production, Leibniz-Institute for Agricultural Engineering, Max-Eyth-Allee 100, 14469 Potsdam, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sven","family":"Augustin","sequence":"additional","affiliation":[{"name":"German Aerospace Center (DLR), Institute for Planetary Research, Experimental Planetary Physics (XP), Rutherfordstr. 2, 12489 Berlin, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4890-9574","authenticated-orcid":false,"given":"Robin","family":"Gebbers","sequence":"additional","affiliation":[{"name":"Department Engineering for Crop Production, Leibniz-Institute for Agricultural Engineering, Max-Eyth-Allee 100, 14469 Potsdam, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2011,10,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1023\/B:PRAG.0000022358.24102.1b","article-title":"Efficacy of grid and zone soil sampling approaches for site-specific assessment of phosphorus, potassium, pH, and organic matter","volume":"5","author":"Mallarino","year":"2004","journal-title":"Precis. Agric"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"479","DOI":"10.1111\/j.1365-2389.2010.01258.x","article-title":"Two contrasting spatial processes with a common variogram: Inference about spatial models from higher-order statistics","volume":"61","author":"Lark","year":"2010","journal-title":"Eur. J. Soil Sci"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"272","DOI":"10.1016\/j.compag.2005.05.001","article-title":"Direct measurement of soil chemical properties on-the-go using ion-selective electrodes","volume":"48","author":"Adamchuk","year":"2005","journal-title":"Comput. Electron. Agric"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"171","DOI":"10.1016\/j.still.2004.03.022","article-title":"Towards development of on-line soil moisture content sensor using a fibre-type NIR spectrophotometer","volume":"80","author":"Mouazen","year":"2005","journal-title":"Soil Till. Res"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"393","DOI":"10.1016\/S1537-5110(02)00283-0","article-title":"A review of the technologies for mapping within-field variability","volume":"84","author":"Godwin","year":"2003","journal-title":"Biosys. Eng"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"469","DOI":"10.1111\/j.1365-2389.2010.01261.x","article-title":"Sensitivity of multi-coil frequency domain electromagnetic induction sensors to map soil magnetic susceptibility","volume":"61","author":"Simpson","year":"2010","journal-title":"Eur. J. Soil Sci"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/j.compag.2004.03.002","article-title":"On-the-go soil sensors for precision agriculture","volume":"44","author":"Adamchuk","year":"2004","journal-title":"Comput. Electron. Agr"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"573","DOI":"10.3390\/s110100573","article-title":"Soil pH-mapping with an on-the-go sensor","volume":"11","author":"Schirrmann","year":"2011","journal-title":"Sensors"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1269","DOI":"10.2136\/sssaj2007.0177","article-title":"Nondestructive system for analyzing carbon in the soil","volume":"72","author":"Wielopolski","year":"2008","journal-title":"Soil Sci. Soc. Am. J"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"309","DOI":"10.1007\/s11119-006-9009-6","article-title":"Evaluation of the soil penetration resistance along a transect to determine the loosening depth","volume":"7","author":"Domsch","year":"2006","journal-title":"Precis. Agric"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"3447","DOI":"10.3390\/s8053447","article-title":"Sensing and 3D mapping of soil compaction","volume":"8","author":"Tekin","year":"2008","journal-title":"Sensors"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"301","DOI":"10.1016\/0167-1987(93)90003-8","article-title":"A system for measuring soil physical-properties in the field","volume":"26","author":"Morgan","year":"1993","journal-title":"Soil Till. Res"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"548","DOI":"10.3390\/s7040548","article-title":"Simulated effects of soil temperature and salinity on capacitance sensor measurements","volume":"7","author":"Schwank","year":"2007","journal-title":"Sensors"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"3314","DOI":"10.3390\/s100403314","article-title":"A FDR sensor for measuring complex soil dielectric permittivity in the 10\u2013500 MHz frequency range","volume":"10","author":"Skierucha","year":"2010","journal-title":"Sensors"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"338","DOI":"10.1002\/jpln.200700088","article-title":"A spatial approach to soil-ecological experimentation at landscape scale","volume":"171","author":"Joschko","year":"2008","journal-title":"J. Plant Nutr. Soil Sci"},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Allred, BJ, Daniels, JJ, and Ehsani, MR (2008). Handbook of Agricultural Geophysics, CRC Press, Taylor and Francis Group.","DOI":"10.1201\/9781420019353"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"4213","DOI":"10.3390\/s8074213","article-title":"On the soil roughness parameterization problem in soil moisture retrieval of bare surfaces from synthetic aperture radar","volume":"8","author":"Verhoest","year":"2008","journal-title":"Sensors"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2458","DOI":"10.3390\/s7102458","article-title":"Operational mapping of soil moisture using synthetic aperture radar data: Application to the Touch Basin (France)","volume":"7","author":"Baghdadi","year":"2007","journal-title":"Sensors"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1174","DOI":"10.3390\/s80201174","article-title":"Temporal stability of soil moisture and radar backscatter observed by the advanced Synthetic Aperture Radar (ASAR)","volume":"8","author":"Wagner","year":"2008","journal-title":"Sensors"},{"key":"ref_20","unstructured":"(1976). Methodenbuch Bd 3: Die chemische Untersuchung von Futtermitteln, VDLUFA. [3 ed]."},{"key":"ref_21","unstructured":"(1976). Methodenbuch Bd 3: Die chemische Untersuchung von Futtermitteln, VDLUFA. [3 ed]."},{"key":"ref_22","unstructured":"DIN EN 12880 (S2a) (2001). Charakterisierung von Schl\u00e4mmen\u2014Bestimmung des Trockenr\u00fcckstandes und des Wassergehaltes, Beuth Verlag GmbH. [2001\u201302 ed]."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/11\/10\/9973\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:57:46Z","timestamp":1760219866000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/11\/10\/9973"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,10,21]]},"references-count":22,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2011,10]]}},"alternative-id":["s111009973"],"URL":"https:\/\/doi.org\/10.3390\/s111009973","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011,10,21]]}}}