Influence of the pedo-climatic variability in Haute- Normandie (NW France) on the intra field spatial variability on yields of wheat and oilseed rape

摘要

The pedo-climatic context of Haute-Normandie, NW France and the heterogeneity of some fields led a French farmers group to undertake a 4-year field investigation to test the efficiency of precision agriculture to save N fertilizer with site specific application. The aim of this study was to use mathematical models to define the technical and economic optimum of N fertilization rates to be applied by site-specific techniques. Crop response (wheat and oil seed rape) varied with the depth of the soil and the annual precipitation (soil moisture). The results show, under these conditions, the possibility of reducing N application rates by 20 kg/ha for wheat and more than 35 kg/ha for oilseed rape.