Runoff samples from two agricultural fields to be analyzed for nutrient concentrations sit in holders on Thursday, March 12, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart)

University of Vermont graduate student Delaney Bullock gathers runoff samples from two agricultural fields to be analyzed for nutrient concentrations on Thursday, March 12, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart)

University of Vermont graduate student Delaney Bullock gathers runoff samples from two agricultural fields to be analyzed for nutrient concentrations on Thursday, March 12, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart)

Joshua Faulkner, left, research associate professor and director of the Agricultural and Environmental Testing Lab at the University of Vermont, and graduate student Delaney Bullock check on flumes used to collect runoff from two agriculture fields for analysis on Thursday, March 12, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart) (AP Photo/Amanda Swinhart)

A field used for corn silage on Blue Spruce Farm is pictured on Tuesday, March 24, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart)

A field used for corn silage on Blue Spruce Farm is pictured on Tuesday, March 24, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart)

University of Vermont graduate student Delaney Bullock gathers runoff samples from two agricultural fields to be analyzed for nutrient concentrations on Thursday, March 12, 2026, in Bridport, Vt. (AP Photo/Amanda Swinhart)

James Conti works on the floor at the New York Stock Exchange in New York, Tuesday, March 31, 2026. (AP Photo/Seth Wenig)