Pound for pound of actual nutrients, liquid or dry sources of nitrogen are about the same, and choice depends largely on cost. This article is the first of two dealing with the relative costs of using either.
Heady, Earl O.; Smith, Wesley G.; and Stritzel, J. A.
"Liquid or Dry Nitrogen,"
Iowa Farm Science: Vol. 12
, Article 3.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss12/3