The nitrate content in all soils is maintained through the action of microorganisms upon ammonia. This process of nitrate production is called nitrification. It is interesting to note the effect that lime and rock phosphate has upon the nitrate producing power in an acid soil.
Proceedings of the Iowa Academy of Science
©1933 Iowa Academy of Science, Inc.
Dean, Harold L. and Smith, F. B.
"The Effect of Lime and Phosphate on Nitrification in an Acid Soil,"
Proceedings of the Iowa Academy of Science, 40(1), 84-85.
Available at: https://scholarworks.uni.edu/pias/vol40/iss1/29