Gerhard Brankatschk provides solutions for methodological limitations of agricultural Life Cycle Assessments (LCAs). The author solves challenges of attributing multifunctionality (co-products) and temporal system boundaries (crop rotations) of agricultural systems by establishing two new Life Cycle Inventory methodologies, which conform to ISO-standards on LCA. The new methods help to assess temporal, spatial, and multifunctional complexity of agricultural systems and to improve the reliability of life cycle based sustainability assessments of agriculture.