Farmers must be concerned about both the monetary loss and the threat of groundwater and surface water pollution associated with the loss of plant nutrients from their fields. There is also an increasing public concern about pollution and the role of agriculture in nonpoint-source pollution. Movement of water over the surface of the soil as well as through the soil profile increases the potential for loss of water-soluble nutrients, especially nitrates.
Blevins, Robert L. and Frye, Wilbur, "Nutrient Losses From Conventional and No-Till Cornfields" (1987). Soil Science News and Views. 42.