T he state of Iowa is a national leader in applying the watershed approach to improve water quality. In addition to protecting and improving local water resources, this effort is inspired by calls from the United States Environmental Protection Agency (USEPA) for states in the Mississippi River Basin to reduce hypoxia in the Gulf of Mexico (Stoner 2011; Beauvais 2016). The Iowa Nutrient Reduction Strategy (INRS) was released in 2013 to establish a framework for reducing nitrogen (N) and phosphorus (P) loads to Iowa and downstream surface waters (IDALS et al. 2017). The INRS provides flexibility to local watershed stakeholders to identify appropriate ways to organize and implement conservation practices that reduce nutrient loss. To best accomplish this, the Iowa Soybean Association (ISA)—along with its farmer members and partner organizations—supports use of planning, implementation, and evaluation at the scale of 12-digit hydrologic unit code (HUC12) watersheds. Many HUC12 watersheds in Iowa are composed primarily of agricultural land (93%) or contain no point sources prioritized within the INRS (93%). These small, rural watersheds are the current scale and focus of most INRS-focused watershed projects in Iowa. To achieve INRS goals, the state of Iowa must transition from demonstration HUC12 watershed projects to full-scale, statewide implementation of the strategy. The INRS promotes a flexible, voluntary approach to reducing agricultural nutrient loading. As such, there is a need to create enabling conditions for broad increases in conservation adoption within the context of the watershed approach. Watershed planning has been and will continue to be a critical component of this effort. The ISA engages farmers …

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结合农民投入和农业保护规划框架的结果来制定爱荷华州的流域计划

爱荷华州在应用流域方法改善水质方面处于全国领先地位。除了保护和改善当地水资源之外，这项努力还受到美国环境保护署 (USEPA) 呼吁密西西比河流域各州减少墨西哥湾缺氧的呼吁（Stoner 2011；Beauvais 2016）。爱荷华州养分减少战略 (INRS) 于 2013 年发布，旨在为减少爱荷华州和下游地表水的氮 (N) 和磷 (P) 负荷建立框架（IDALS 等人，2017 年）。INRS 为当地流域利益相关者提供了灵活性，以确定组织和实施减少养分损失的保护实践的适当方法。为了最好地实现这一点，爱荷华州大豆协会 (ISA) 及其农民成员和合作伙伴组织支持在 12 位水文单位代码 (HUC12) 流域尺度上进行规划、实施和评估。爱荷华州的许多 HUC12 流域主要由农业用地组成 (93%) 或不包含在 INRS 中优先考虑的点源 (93%)。这些小型农村流域是爱荷华州大多数以 INRS 为重点的流域项目的当前规模和重点。为了实现 INRS 目标，爱荷华州必须从示范 HUC12 流域项目过渡到全州范围内全面实施该战略。INRS 提倡采用灵活、自愿的方法来减少农业养分负荷。因此，需要为在流域方法范围内广泛增加采用保护创造有利条件。流域规划一直并将继续成为这项工作的重要组成部分。ISA 让农民参与……