Regulating farmer nutrient management: a three-state case study on the delmarva peninsula.

Area of Science:

• Environmental Science
• Agricultural Science
• Policy Analysis

Background:

• Water quality concerns and fish kills led Maryland, Delaware, and Virginia to regulate agricultural nutrient pollution.
• All three states mandated nutrient management plans (NMPs) for farmers to optimize yields and minimize environmental impact.
• Policy-making processes differed across states, influencing regulatory approaches.

Purpose of the Study:

• To analyze the impact of policy-making processes on farmer compliance with nutrient management regulations.
• To assess the effectiveness of nutrient management practices in improving water quality.
• To identify successes and shortcomings in regulating agricultural nonpoint source pollution.

Main Methods:

• Political and policy analysis of regulatory frameworks in Maryland, Delaware, and Virginia.
• Interviews with 60 farmers and 68 policy stakeholders on the Delmarva Peninsula.
• Analysis of state regulatory agency data on compliance and nutrient management practices.

Main Results:

• Contentious policy-making in Maryland led to initially poor administrative compliance; collaborative approaches in Delaware yielded high initial compliance.
• Farmers demonstrated good adoption of having a plan, soil/manure testing, and split-applying nitrogen fertilizer.
• Poor adoption rates (≤60%) were observed for practices like residual nitrogen credits, manure-free setbacks, winter manure application, and spreader calibration across all states.

Conclusions:

• The policy-making process significantly influenced initial farmer compliance with nutrient management plans.
• While some core practices were adopted, significant gaps exist in implementing comprehensive nutrient management strategies.
• Voluntary adherence and enforcement challenges indicate a need for improved strategies to ensure full implementation and effectiveness of nutrient management plans.