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1. Phenological analysis of unmanned aerial vehicle based time series of barley imagery with high temporal resolution

Author:
Kraska, T.,   et al.   ; Burkart, A.; Hecht, V.L.; Rascher, U.;     Show all 4 Authors
Source:
Precision agriculture 2018 v.19 no.1 pp. 134-146
ISSN:
1385-2256
Subject:
aerial photography; barley; case studies; corn; crop management; cultivars; developmental stages; experimental design; field experimentation; flight; germination; harvesting; phenology; phenotype; precision agriculture; ripening; seasonal development; soil; sowing; time series analysis; unmanned aerial vehicles; vegetative growth
Abstract:
... Emerging strategies and technologies in agriculture, such as precision farming and phenotyping depend on detailed data on all stages of crop development. Unmanned aerial vehicles promise to deliver such time series as they allow very frequent measurements. In this study, we analyse a field trial with two barley cultivars and two contrasting sowing densities in a random plot design over 2 consecuti ...
DOI:
10.1007/s11119-017-9504-y

2. Anomalous fluid properties of carbon dioxide in the supercritical region: application to geological CO2 storage and related hazards

Author:
Kraska, T.,   et al.   ; Imre, A. R.; Ramboz, C.; Deiters, U. K.;     Show all 4 Authors
Source:
Environmental earth sciences 2015 v.73 no.8 pp. 4373-4384
ISSN:
1866-6280
Subject:
carbon dioxide; compressibility; equations; heat; France; Hungary
Abstract:
... For supercritical fluids there is a wedge-shaped region called Widom region, where several physico-chemical quantities (e.g. compressibility, heat capacities, density, thermal expansivity, speed of sound) show anomalous behaviour. In this paper, several Widom lines of supercritical CO₂have been computed with the Wagner–Span reference equation of state. The locations of the Widom lines are compared ...
DOI:
10.1007/s12665-014-3716-5

3. Field vaccination of sheep with a larval-specific antigen of the gastrointestinal nematode, Haemonchus contortus, confers significant protection against an experimental challenge infection

Author:
Kraska, T.,   et al.   ; Piedrafita, D.P.; de Veer, M.J.; Sherrard, J.; Elhay, M.; Meeusen, E.N.;     Show all 6 Authors
Source:
Vaccine 2012 v.30 no.50 pp. 7199-7204
ISSN:
0264-410X
Subject:
Haemonchus contortus; anthelmintics; antigens; blood serum; cross reaction; eggs; fecal egg count; gastrointestinal nematodes; hematocrit; larvae; nematode infections; pastures; protective effect; sheep; stress response; vaccination; vaccines
Abstract:
... The availability of effective vaccines would add a valuable tool to the management of gastrointestinal nematode infections in livestock. While some experimental vaccines have shown protection in laboratory trials, few have been tested in the field. In the present study, eight month old sheep kept on pasture were treated with anthelmintic 8weeks before vaccination with a larval surface antigen of t ...
DOI:
10.1016/j.vaccine.2012.10.019

4. Sun‐induced fluorescence – a new probe of photosynthesis: First maps from the imaging spectrometer HyPlant

Author:
Kraska, T.,   et al.   ; Rascher, U.; Alonso, L.; Burkart, A.; Cilia, C.; Cogliati, S.; Colombo, R.; Damm, A.; Drusch, M.; Guanter, L.; Hanus, J.; Hyvärinen, T.; Julitta, T.; Jussila, J.; Kataja, K.; Kokkalis, P.; Kraft, S.; Matveeva, M.; Moreno, J.; Muller, O.; Panigada, C.; Pikl, M.; Pinto, F.; Prey, L.; Pude, R.; Rossini, M.; Schickling, A.; Schurr, U.; Schüttemeyer, D.; Verrelst, J.; Zemek, F.;     Show all 31 Authors
Source:
Global change biology 2015 v.21 no.12 pp. 4673-4684
ISSN:
1354-1013
Subject:
absorption; carbon dioxide; chlorophyll; field experimentation; fluorescence; functional status; image analysis; monitoring; photosynthesis; photosynthetically active radiation; plant stress; prediction; reflectance; remote sensing; seasonal variation; spectral analysis; spectrometers; spectroscopy; uncertainty; vegetation types
Abstract:
... Variations in photosynthesis still cause substantial uncertainties in predicting photosynthetic CO₂ uptake rates and monitoring plant stress. Changes in actual photosynthesis that are not related to greenness of vegetation are difficult to measure by reflectance based optical remote sensing techniques. Several activities are underway to evaluate the sun‐induced fluorescence signal on the ground an ...
DOI:
10.1111/gcb.13017