Michigan State University Extension
Soils & Soil Management - Fertilizer - 06209709
07/10/97
Fluid Fertilizers--Liquids and Suspensions MSU Ag Facts Extension Bulletin E-933, December 1984, Revised, destroy previous editions
by R. E. Lucas and M. L. Vitosh, Department of Crop and Soil Sciences
Anhydrous ammonia and certain liquid ammonia solutions need to be injected into the soil to prevent ammonia losses. Water mixtures containing ammonium nitrate and urea (28 to 32 percent N) are popular, competitively priced products that can be rapidly applied broadcast. Follow the recommended practices to prevent urea volatilization, whether you apply dry or in a liquid solution. Losses are greatest when urea is applied to dry surfaces, the soil temperature is high and the soil pH is above 7. To reduce losses, incorporate or water the urea into the soil or apply into moist soil.