Nitrate Leaching Findings

 

Twenty percent  of the conventional corn and soybean row crop system samples exceeded the 10 ppm limit for healthy drinking water while only 10 and 16% of the organic manure or cash grain systems exceeded the same limit.

 

 

 

 

 

Leached total nitrate for raw dairy manure, conventional synthetic fertilizer and broiler litter leaf compost were 100, 75, and 33 lbs per acre, respectively, over the 1994 to 2003 time period.