Systems of food production and provision face a set of complex and interdependent challenges to sustainably meet current and future nutrition needs and minimize the negative social and ecological consequences of modern agriculture. Food system localization, often in the context of specific initiatives like farmers’ markets, are frequently put forth as a promising strategy for establishing more just food systems and agroecological production that relies on regional resources and in situ ecological processes rather than agrichemical inputs. Despite a significant literature on local food, there remain critical omissions in geographic inquiry, particularly analyses of scale in regard to food system localization. This article uses scale as an analytical lens to examine phosphorus fertility on farms participating in a farmers’ market network in New York City. Through a synthesis of biogeochemical analysis, semistructured interviews, and nutrient network mapping, the work charts the complex and often contradictory interactions of material and discursive scales in local food systems. The lens of scale reveals multiple narratives of sustainability, indicating both the great potential for agroecological phosphorus management and significant structural problems that undermine the project of food system localization. These findings argue for a more expansive approach to localization that acknowledges a mosaic of overlapping scalar processes in food systems and that the sustainability promise of food system localization requires interconnected sustainabilities in multiple places and at multiple scales. Key Words: agroecology, local food systems, phosphorus, scale, sustainability.

粮食生产和供应系统面临一系列复杂而相互依存的挑战，以可持续地满足当前和未来的营养需求，并最大程度地减少现代农业的负面社会和生态后果。经常在诸如农民市场之类的特定举措的背景下，对粮食系统进行本地化，常常被认为是建立有前途的战略，以建立更公正的粮食系统和农业生态生产，而粮食系统和农业生态生产依赖于区域资源和就地生态过程而不是农业化学投入。尽管有大量关于当地食品的文献，但地理查询，尤其是有关食品系统本地化的规模分析仍存在关键遗漏。本文使用量表作为分析透镜，研究参与纽约市农民市场网络的农场的磷肥力。通过对生物地球化学分析，半结构式访谈和营养网络图的综合，该工作可以绘制出当地食品系统中物质尺度和话语尺度之间复杂且经常相互矛盾的相互作用的图表。规模的镜头揭示了可持续性的多种叙述，既表明了农业生态磷管理的巨大潜力，又破坏了粮食系统本地化项目的重大结构性问题。关键词：农业生态，当地粮食系统，磷，规模，可持续性。