This report begins with an ‘Executive summary’ which highlights key findings of the research undertaken. The body of the report is then presented in five distinct sections. Section 1 describes the dairy cow production study undertaken and examines the performance of the cows on each of the four experimental systems. Section 2 provides a detailed description of the establishment and management of the experimental ‘farmlet’ site used to measure nutrients losses. In Sections 3 and 4, details of nutrient losses measured within the farmlet site are presented. Finally, Section 5 provides a detailed description of four plot experiments which were undertaken to examine strategies by which to reduce phosphorus losses from applied slurry.