Photo © JE Nilsson 2024
Introduction
The growing discourse on recycled nutrients (RNs) in organic farming is influenced by several key factors. Nutrient deficits, particularly of phosphorus (P) and potassium (K), are a significant challenge in organic farming, as biological nitrogen (N) fixation can only partly meet nitrogen demand, necessitating the replenishment of other nutrients through external inputs. Yet the uptake and use of RNs remains challenging. Concerns about contaminants, such as potentially toxic elements (PTEs), microplastics, and antibiotic resistance genes, create doubts among organic farmers regarding the safety and health impacts on soil and crops. Although some contaminants are declining, and soils show resilience in degrading or stabilizing pollutants, uncertainties persist.
The integration of nutrient recycling within the broader circular economy framework aligns with organic farming principles, promoting the reuse of societal waste streams to reduce reliance on finite mineral resources and minimize environmental impacts. However, acceptance of such practices remains debated within the organic sector. Economic feasibility and policy support are crucial, as cost-benefit analyses highlight the varying viability of different ecotechnologies. Technologies like anaerobic digestion of agricultural wastes are more economically viable compared to those in the wastewater sector, which require significant investments. Effective implementation depends on aligning economic and policy incentives with sustainability goals.
Public perception and stakeholder involvement also play a critical role, as participatory decision-making processes address local concerns and improve the legitimacy of implementing new ecotechnologies. Addressing stakeholders’ concerns about health risks, environmental pollution, and technical reliability is essential for broader acceptance. These factors collectively shape the ongoing discussion on the use of RNs in organic farming, balancing the benefits of nutrient recycling with the challenges posed by contamination, economic viability, and public acceptance.
In this article, a brief literature review is conducted to place the current discourse and concerns regarding RNs and nutrient recycling practices within the broader context of the circular economy, aiming to investigate how the uptake of RNs can be more effectively addressed.
Using 9 journal articles [1-9] as example studies of the field, this article begins by tracing the historical context and use of term “recycled nutrients”. It examines the various technological, environmental, economic, and policy-related dimensions of nutrient recycling, and illustrates how the practice of nutrient recycling can become an integral part of the circular economy. Continue reading ”Advancing the Discourse on Recycled Nutrients: Integrating Sustainable Practices into the Circular Economy”
