Analyse der Ertrags- und Unkrautverteilung in Ackerschlägen mit einem Geo-Informations-System (GIS).

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Title:	Analyse der Ertrags- und Unkrautverteilung in Ackerschlägen mit einem Geo-Informations-System (GIS).
Authors:	Timmermann, C¹, Gerhards, R¹, Kühbauch, W¹
Source:	Journal of Agronomy & Crop Science. Jan2002, Vol. 188 Issue 1, p34-42. 9p.
Subjects:	Crop yields, Weeds, Precision farming
Abstract (English):	Analysis of the yield and weed distribution in arable fields in a Geo Information System (GIS) The variation in yield was assessed and mapped in cereals, maize, sunflower and faba beans at Dikopshof Research Station of the University of Bonn from 1998 to 2000 using a CERES 2 yield sensor (RDS® Company, Minchin-hampton, UK). The calculated yields differed on average by 4–12 % from weighed grain yields depending on the crop and the grain moisture. The yield maps were georeferenced with a Geo Information System and compared to soil and aerial maps, field data and maps of the weed, nutrient and organic matter distributions to identify reasons for the yield variation. In two of the three fields studied, a strong correlation amongst grain yield, soil quality and relief map was found. In another field that was originally separated into two sections with different crop rotations, the distributions of grain yield, phosphorus, potassium and organic matter were still influenced by the former cropping system. On the basis of the results of this study, recommendations were made for site-specific crop management. In addition, the results of this study contribute to elucidation of the complex influences of soil and management on the grain yield. [ABSTRACT FROM AUTHOR]
Abstract (German):	Auf dem Versuchsgut Dikopshof der Universität Bonn wurde in den Jahren 1998–2000 die Ertragsverteilung in Getreide-, Mais-, Sonnenblumen und Ackerbohnenflächen mit dem Ertragskartierungssystem CERES 2 der Firma RDS® erfaßt und kartiert. Im Mittel wichen die gemessenen Erträge je nach Kulturpflanze um c . 4 % bis c . 12 % von den gewogenen Kornerträgen ab. Die Ertragskarten wurden in einem Geo-Informationssystem georeferenziert und mit Daten aus der Ackerschlagkartei, Boden- und Luftbildkarten sowie Karten der Unkraut-, Nährstoff- und Humusverteilung verglichen, um so Ursachen für die unterschiedliche Ertragsverteilung zu erkennen. Auf zwei der vier untersuchten Ackerflächen bestand eine enge Beziehung zwischen der Höhe des Kornertrages und den Ackerzahlen sowie dem Relief. Auf einer Fläche führte die ehemalige Trennung des Schlages in zwei Teilbereiche mit verschiedener Felderfolge zu Unterschieden im Kornertrag sowie in der Kalium-, Phosphat- und Humusversorgung. Aus den Untersuchungsergebnissen können Empfehlungen für die teilschlagspezifische Bewirtschaftung der Flächen abgeleitet und Kenntnisse über den komplexen Einfluss von Standort und Bewirtschaftung auf den Ertrag gewonnen werden. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	Analysis of the yield and weed distribution in arable fields in a Geo Information System (GIS) The variation in yield was assessed and mapped in cereals, maize, sunflower and faba beans at Dikopshof Research Station of the University of Bonn from 1998 to 2000 using a CERES 2 yield sensor (RDS® Company, Minchin-hampton, UK). The calculated yields differed on average by 4–12 % from weighed grain yields depending on the crop and the grain moisture. The yield maps were georeferenced with a Geo Information System and compared to soil and aerial maps, field data and maps of the weed, nutrient and organic matter distributions to identify reasons for the yield variation. In two of the three fields studied, a strong correlation amongst grain yield, soil quality and relief map was found. In another field that was originally separated into two sections with different crop rotations, the distributions of grain yield, phosphorus, potassium and organic matter were still influenced by the former cropping system. On the basis of the results of this study, recommendations were made for site-specific crop management. In addition, the results of this study contribute to elucidation of the complex influences of soil and management on the grain yield. [ABSTRACT FROM AUTHOR]
ISSN:	09312250
DOI:	10.1046/j.1439-037x.2002.00542.x