The scientific objectives are to enhance the knowledge in the field of cropphysiology, crop and weed ecology in order to contribute to the societal needs and the conservation of natural resources. The means to achieve these objectives are: a.To study processes of the functioning of crops and weeds in relation to genetic, biotic and abiotic factors and b.To analyse and develop sustainable and profitable plant production chains and cropping systems for temperate and tropical regions. The research aims at an integrated approach by means of experimental research and modelling at various aggregation levels.