caa a22 4500 477111459 CHVBK 20180405111610.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00015408 doi (NATIONALLICENCE)springer-10.1007/BF00015408 Soil productivity management and plant growth in the Sahel: Potential of an aerial monitoring technique [Elektronische Daten] [A. Buerkert, F. Mahler, H. Marschner] Spatial variability of plant growth has been a major problem for plant physiologists, agronomists, agro-foresters and soil scientists comparing or modelling treatment effects on acid sandy soils in the Sahel. While aerial photographs from aeroplanes or satellite images may provide valuable information for the surveying of large areas, their use for individual small experiments or farmers' fields has been limited due to high costs, restricted availability, and unsatisfactory resolution. As a simple alternative, a commercially available Zeppelin-type balloon, dragged on a rope by a camel, was fitted with an standard 35 mm camera and a remote control system. Flight altitude varied from 20 m to 500 m above ground. A ground-based camera mounted vertically on a tripod was used to center the Zeppelin over the target area. The high-resolution true colour negatives and colour infrared slides obtained by this device were used to unravel the history of farmers' management strategies for maintaining soil productivity, to monitor treatment effects and crop growth variability in an on-station experiment, and to visualize light absorption by photosynthesis in crops and trees. Such non-destructively collected data may serve as quick but reliable references for ground measurements in a wide range of experiments with loosely-spaced crops, bushes, and trees. ei]B E Clothier Kluwer Academic Publishers, 1996 acid soils nationallicence aerial photography nationallicence crop growth variability nationallicence remote sensing nationallicence Buerkert A. Institute of Plant Nutrition, University of Hohenheim, D-70593, Stuttgart, Germany aut Mahler F. ICRISAT Sahelian Center, B. P. 12404, Niamey, Niger aut Marschner H. Institute of Plant Nutrition, University of Hohenheim, D-70593, Stuttgart, Germany aut Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl 180/1(1996-03-01), 29-38 0032-079X 180:1<29 1996 180 11104 https://doi.org/10.1007/BF00015408 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00015408 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Buerkert A. Institute of Plant Nutrition, University of Hohenheim, D-70593, Stuttgart, Germany aut NATIONALLICENCE 700 1- Mahler F. ICRISAT Sahelian Center, B. P. 12404, Niamey, Niger aut NATIONALLICENCE 700 1- Marschner H. Institute of Plant Nutrition, University of Hohenheim, D-70593, Stuttgart, Germany aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; gopher://gopher.wkap.nl/ 180/1(1996-03-01), 29-38 0032-079X 180:1<29 1996 180 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer