The prohibitive costs of resupplying air, water, and food from Earth will strictly limit long duration space habitation and travel. To reduce the need of life support commodities, regenerative life support systems have been investigated by NASA for over 30 years. Components under consideration for inclusion in a regenerative life support system are based on biological processes. One basic approach to such support the biological processes (bioregenerative) that use higher plants and systems for nutrient recovery. Biological systems would use crop yields and bioreactors to supply crew needs. A key component to any regenerative life support system is recovering and recycling of inedible biomass resources. Researchers at Kennedy Space Center (KSC) Advanced Life Support Breadboard Project lead several bioregenerative experiments focusing on the utilization of higher plants to produce a liquid effluent solution which provided essential nutrients for crop growth. Comparing the biological systems of plant decomposition and efficiency of nutrient recovery may increase confidence for bioregenerative integration methods into life support systems.