The yields from cereals in Norwegian organic stockless cropping systems are low, and the demand for grains for feed and food is far from being met by inland production. The present project aims at developing options for increasing the productivity. Pest c ontrol and nutrient supply are outlined as important bottlenecks, and experiments and studies will be conducted in settings that allow concern for both challenges simultaneously. Nutrient supply will be sought improved by application of organic wastes fro m society (residues from biogas production, meat and bone meal and reactor composted catering waste) and compared with the supply from cattle manure and soil organic matter in field trials. The grain yield and quality and incidence of perennial weeds and seed borne pathogens will be recorded. It is expected that improved nutrient supply will allow a higher proportion of cereals in the crop rotation and fewer windows for weed control. It will therefore be investigated to what extent intensive soil cultivat ion by different harrows in spring suppresses perennial weeds. A challenge is not to cause detrimental delays in crop establishment. Studies of bud development in undisturbed and disturbed populations of perennial weeds will also be undertaken to suggest further innovations in weed control. Environmental aspects of the investigated amendments for nutrient supply and pest control will also be evaluated. A cereal rotation fertilized with waste products will be implemented in the system experiment at Biofors k Apelsvoll, and previous and future recordings of losses of N and P from this experiment will supply relevant data for the evaluation. An economical planning program for conversion to organic farming will be used for the assessment of profitability. Biof orsk, the extension service (NLR), Hedmark Univ. College, SLU and Aarhus Univ. will collaborate to do the research, and companies within the cereal industry and the waste sector are also partners in the project.