Considering the growing emphasis on resource efficiency in sustainable living, how can the process of sprout cultivation be fully integrated into a zero waste framework? Specifically, what methodologies or protocols exist to manage both input materials and resultant waste in a manner that maximizes nutrient cycles and minimizes environmental impact? Additionally, are there documented case studies or experimental protocols that validate the efficacy of using sprout production residues for composting or as bio-inputs in closed-loop systems? An analysis of these aspects could further refine best practices within sustainable agricultural practices and zero waste initiatives.