The present invention relates to increasing
longevity of the
nitrogen content of soil through improved liquid delivery formulations of
nitrification inhibitors. The liquid formulation can also be comprised of
nitrification inhibitors and optionally
urease inhibitors that are blended solutions of each. The
nitrification inhibitors are present in a mixture that comprises both a protic and an aprotic
solvent system. The novel formulations are designed to be applied to fertilizers, especially
urea and
manure based fertilizers. The delivery formulations provide an environmentally sound and inherently safe solvating
system that improves the storage stability of the
urease inhibitors by utilizing liquid organic non-water containing solvents, maintains the
nitrification inhibitors in solution to storage temperatures of at least 10° C., and provides improved application to
fertilizer of
nitrification inhibitors. These delivery formulations enable
safe storage, transport and subsequent application or blending with
urea-based or
manure-based fertilizers that can be applied to soil in either a liquid or granular form to provide improved
nitrogen retention in the soil for uptake for
plant life.