Výsledky vyhledávání - "Anton Thomsen"

A RVI/LAI-reference curve to detect N stress and guide N fertigation using combined information from spectral reflectance and leaf area measurements in potato

Autor: Zhenjiang Zhou, Anton Thomsen, Finn Plauborg, Mathias Neumann Andersen

Publikováno v: Zhenjiang, Z, Plauborg, F, Thomsen, A G & Andersen, M N 2017, ' A RVI/LAI-reference curve to detect N stress and guide N fertigation using combined information from spectral reflectance and leaf area measurements in potato ', European Journal of Agronomy, vol. 87, pp. 1-7 . https://doi.org/10.1016/j.eja.2017.04.002

More user-friendly methods are needed to detect crop N status/stress and guide the timing of in-season N application. In the current study, a reference curve method of detecting N stress was proposed to remedy practical problems of methods that requi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1397389c26d322e21701d86ddd4beeda
https://doi.org/10.1016/j.eja.2017.04.002

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On-the-Go Sensor Fusion for Prediction of Clay and Organic Carbon Using Pre-processing Survey, Different Validation Methods, and Variable Selection

Autor: Mogens Humlekrog Greve, Salman Tabatabai, Maria Knadel, Anton Thomsen

Publikováno v: Tabatabai, S, Knadel, M, Thomsen, A G & Greve, M H 2019, ' On-the-Go Sensor Fusion for Prediction of Clay and Organic Carbon Using Pre-processing Survey, Different Validation Methods, and Variable Selection ', Soil Science Society of America Journal, vol. 83, no. 2, pp. 300-310 . https://doi.org/10.2136/sssaj2018.10.0377
Tabatabai, S, Knadel, M, Thomsen, A & Greve, M H 2019, ' On-the-Go Sensor Fusion for Prediction of Clay and Organic Carbon Using Pre-processing Survey, Different Validation Methods, and Variable Selection ' Soil Science Society of America Journal, vol. 83, no. 2, pp. 300 . https://doi.org/10.2136/sssaj2018.10.0377

Using on-the-go visible and near-infrared (Vis–NIR) spectroscopy singularly or in combination with other sensor data has been found to produce promising cross-validation (CV) and prediction results. In this study, besides from testing two CV method

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ea3db41292dcf074bbb62c8103d9bfbf
https://pure.au.dk/portal/da/publications/onthego-sensor-fusion-for-prediction-of-clay-and-organic-carbon-using-preprocessing-survey-different-validation-methods-and-variable-selection(5816969a-d30b-4b24-aa9c-96d9a7be5c8b).html

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Crop water stress maps for an entire growing season from visible and thermal UAV imagery

Autor: Rasmus Thybo Jensen, Thomas Friborg, Jesper Rasmussen, Anton Thomsen, Hector Nieto, Helene Hoffmann

Publikováno v: Nielsen, H H M, Jensen, R, Thomsen, A G, Nieto Solana, H, Rasmussen, J & Friborg, T 2016, ' Crop water stress maps for an entire growing season from visible and thermal UAV imagery ', Biogeosciences, vol. 13, no. 24, pp. 6545-6563 . https://doi.org/10.5194/bg-13-6545-2016
Hoffmann, H, Jensen, R, Thomsen, A, Nieto, H, Rasmussen, J & Friborg, T 2016, ' Crop water stress maps for an entire growing season from visible and thermal UAV imagery ', Biogeosciences, vol. 13, no. 24, pp. 6545-6563 . https://doi.org/10.5194/bg-13-6545-2016
Biogeosciences, Vol 13, Iss 24, Pp 6545-6563 (2016)
Digital.CSIC. Repositorio Institucional del CSIC
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This study investigates whether a water deficit index (WDI) based on imagery from unmanned aerial vehicles (UAVs) can provide accurate crop water stress maps at different growth stages of barley and in differing weather situations. Data from both the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1cdd513e07bc6519deaa42a17a3a194b
https://www.biogeosciences.net/13/6545/2016/

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Integrating lysimeter drainage and eddy covariance flux measurements in a groundwater recharge model

Autor: Anton Thomsen, Bo V. Iversen, Rasmus Thybo Jensen, Kirsten Schelde, Vicente Vasquez, Rasmus Ringgaard

Publikováno v: Vasquez, V, Thomsen, A G, Iversen, B V, Jensen, R, Ringgaard, R & Schelde, K 2015, ' Integrating lysimeter drainage and eddy covariance flux measurements in a groundwater recharge model ', Hydrological Sciences Journal, vol. 60, no. 9, pp. 1520-1537 . https://doi.org/10.1080/02626667.2014.904964

Field scale water balance is difficult to characterize because controls exerted by soils and vegetation are mostly inferred from local scale measurements with relatively small support volumes. Eddy covariance flux and lysimeters have been used to inf

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2c87464fe98b1c290ecee1767ea15e62
https://doi.org/10.1080/02626667.2014.904964

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Controls of nitrous oxide emission after simulated cattle urine deposition

Autor: Anton Thomsen, Jørgen E. Olesen, Khagendra Raj Baral, Søren O. Petersen

Publikováno v: Baral, K R, Thomsen, A G, Olesen, J E & Petersen, S O 2014, ' Controls of nitrous oxide emission after simulated cattle urine deposition ', Agriculture, Ecosystems & Environment, vol. 188, pp. 103-110 . https://doi.org/10.1016/j.agee.2014.02.029

Urine deposited during grazing is a significant source of atmospheric nitrous oxide (N 2 O). The potential for N 2 O emissions from urine patches is high, and a better understanding of controls is needed. This study investigated soil nitrogen (N) dyn

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1cac88bbd44910163abb1b05feca1a39
https://doi.org/10.1016/j.agee.2014.02.029

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Visible-Near Infrared Spectra as a Proxy for Topsoil Texture and Glacial Boundaries

Autor: Anton Thomsen, Maria Knadel, Raphael A. Viscarra Rossel, Fan Deng, Mogens Humlekrog Greve

Publikováno v: Knadel, M, A. Viscarra Rossel, R, Deng, F, Thomsen, A G & Greve, M H 2013, ' Visible–Near Infrared Spectra as a Proxy for Topsoil Texture and Glacial Boundaries ', Soil Science Society of America Journal, vol. 77, no. 2, pp. 568-579 . https://doi.org/10.2136/sssaj2012.0093

Spectroscopy is widely recognized as an effective tool for the analysis of soil constituents. It is an efficient alternative to conventional laboratory analysis that can be cumbersome, time consuming and expensive. The majority of studies on the use

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::69837a429dc1282689878a785480ee21
https://doi.org/10.2136/sssaj2012.0093

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Comparing Predictive Abilities of Three Visible-Near Infrared Spectrophotometers for Soil Organic Carbon and Clay Determination

Autor: Anton Thomsen, Fan Deng, Bo Stenberg, Mogens Humlekrog Greve, Maria Knadel

Publikováno v: Knadel, M, Stenberg, B, Deng, F, Thomsen, A G & Greve, M H 2013, ' Comparing predictive abilities of three visible-near infrared spectrophotometers for soil organic carbon and clay determination ', Journal of Near Infrared Spectroscopy, vol. 21, no. 1, pp. 67-80 . https://doi.org/10.1255/jnirs.1035

Due to advances in optical technology, a wide range of spectrometers is available. Recent interests in soil global libraries and sensor fusion presents a challenge with respect to combining data from different instrumentation. Little research, howeve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd9f94d55b8eca9db2ec949e8c7b8bff
https://doi.org/10.1255/jnirs.1035

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Crop water stress maps for entire growing seasons from visible and thermal UAV imagery

Autor: Helene Hoffmann, Rasmus Jensen, Anton Thomsen, Hector Nieto, Jesper Rasmussen, Thomas Friborg

This study investigates whether a Water Deficit Index (WDI) based on imagery from Unmanned Aerial Vehicles (UAVs) can provide accurate crop water stress maps at different growth stages of barley and in differing weather situations. Data from both the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::103e0fb979c51a11c30bef5e50b39dfd
https://doi.org/10.5194/bg-2016-316

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Comparing Evapotranspiration Rates Estimated from Atmospheric Flux and TDR Soil Moisture Measurements

Autor: Henrik Søgaard, Rasmus Ringgaard, Mathias Herbst, Thomas Friborg, Anton Thomsen, Kirsten Schelde

Publikováno v: Schelde, K, Ringgaard, R, Herbst, M, Thomsen, A G, Friborg, T & Søgaard, H 2011, ' Comparing Exapotranspiration Rates Estimated from Atmosphiric Flux and TDR Soil Moisture Measurements ', Vadose Zone Journal, vol. 10, no. 1, pp. 78-83 . https://doi.org/10.2136/vzj2010.0060

Measurements of water vapor fl uxes using eddy covariance (EC) and measurements of root zone soil moisture depleƟ on using Ɵ me domain refl ectometry (TDR) represent two independent approaches to esƟ maƟ ng evapotranspiraƟ on. This study invesƟ

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0823e3a954176dd4ea4723d34e91dd58
https://doi.org/10.2136/vzj2010.0060

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Mobile TDR for geo-referenced measurement of soil water content and electrical conductivity

Autor: Anton Thomsen, Flemming Hald Steffensen, Kirsten Schelde, Per Drøscher

Publikováno v: Thomsen, A, Schelde, K, Drøscher, P & Steffensen, F 2007, ' Mobile TDR for geo-referenced measurement of soil water content and electrical conductivity ', Precision Agriculture, vol. 8, no. 4-5, pp. 213-223 . https://doi.org/10.1007/s11119-007-9041-1

The development of site-specific crop management is constrained by the availability of sensors for monitoring important soil and crop related conditions. A mobile time-domain reflectometry (TDR) unit for geo-referenced soil measurements has been deve

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7471bd5daa21539bb3e3cfb5de529de
https://doi.org/10.1007/s11119-007-9041-1

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