caa a22 4500 47710973X CHVBK 20180405111605.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF02257531 doi (NATIONALLICENCE)springer-10.1007/BF02257531 Recording, processing and analysis of grass root images from a rhizotron [Elektronische Daten] [Olof Andrén, Helena Elmquist, Ann-Charlotte Hansson] To develop and test a system for computer-assisted image analysis, repeated video recordings of reed canary-grass roots (Phalaris arundinacea L.) were made in an 18-window rhizotron. The images were digitized and processed using a Unix computer and the Khoros software development environment. Two image sizes, 126×95 mm and 61×46 mm, both comprising 650 × 490 pixels, were compared. Among image processing techniques used were median filtering, segmentation and skeletonization. Root area and length in both the topsoil and subsoil were estimated using the two image sizes. The resolution (image size) strongly affected the calculated root lengths. The results were compared with root length measurements obtained manually. Statistically significant differences in root length and area in the topsoil were detected between the sampling dates using the computer-assisted methods. Possible sources of error and methods for reducing them are discussed. Kluwer Academic Publishers, 1996 growth dynamics nationallicence image processing nationallicence Phalaris arundinacea nationallicence soil nationallicence video nationallicence Andrén Olof Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07, Uppsala, Sweden aut Elmquist Helena Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07, Uppsala, Sweden aut Hansson Ann-Charlotte Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07, Uppsala, Sweden aut Plant and Soil Kluwer Academic Publishers 185/2(1996-09-01), 259-264 0032-079X 185:2<259 1996 185 11104 https://doi.org/10.1007/BF02257531 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02257531 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Andrén Olof Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07, Uppsala, Sweden aut NATIONALLICENCE 700 1- Elmquist Helena Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07, Uppsala, Sweden aut NATIONALLICENCE 700 1- Hansson Ann-Charlotte Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, P.O. Box 7072, S-750 07, Uppsala, Sweden aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers 185/2(1996-09-01), 259-264 0032-079X 185:2<259 1996 185 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer