Illinois River Quality Linked to Crop Efficiency

The nitrate discharge levels in the Illinois River from 2010 to 2014 were 10% lower than levels recorded in the 1980s and early 1990s.

A study from the University of Illinois suggests the change in nitrate levels may be due to more efficient farming practices as farmers. The study tracked crop yields, fertilizer sales and livestock numbers for the corresponding time periods to calculate residual agricultural nitrogen.

While the levels were highest in the 1980s following severe droughts, by the 1990s, farmers were more efficient with their usage; less fertilizer was needed for similar yields. That reduction in fertilizer use correlated significantly with the decreasing nitrate levels, according to the study’s data analysis.

The U.S. Environmental Protection Agency’s recommended reduction is 45%, so while a 10% drop is significant, researchers noted more ways to reduce the nitrate levels are sought.

Source: University of Illinois