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

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.