Large Urea Granules for Broadcast Application in Perennial Forage Grasses

Large and regular sized urea applied with and without urease and nitrification inhibitors, surface applied, or banded, in fall or spring, for perennial forage grasses.


Engle, R 2008. Study provides a first look at ammonia volatilized from surface applied urea. http://www. montana. edu/cpa/news/nwview. php?article=6007. Engel, R, 2009. On-farm study measures ammonia volatilization losses from urea fertilizer. http://www. montana. edu/cpa/news/nwview. php?article=7286. Goos R. J. and B. E. Johnson. 1993, Effect of urea pellet size and dicyandiamide on residual ammonium in field micro plots. Commus. Soil Sci. Plant Anal. , 24 (5&6), 397-409. Mahli S. S. and M. Nyborg. Read more

Year of initiation:2012
Year of completion:2013

Interpretive Summary


Urea is the most common N fertilizer for surface broadcast applications for perennial forage grass production in the Northern Great Plains (NGP). There is interest to know whether various N fertilizer additives, specifically a urease inhibitor alone or in conjunction with a nitrification inhibitor, can increase N availability and the production of forage grasses. There is also interest in whether larger urea granules (e. g. 0. 5 in.


This research was conducted using a cool season perennial grass pasture. The grasses have been established for 10 years, and were part of an original pasture rejuvenation project conducted by the Chinook Applied Research Association in cooperation with the land owner. The 2012 growing season was characterized as being close to average in temperature, but much more moist.

Updates & Reports




Project Description

Project Leader

Dianne Westerlund, Chinook Applied Research Assn

Project Cooperators


IPNI Staff

T. Jensen


Americas \ Northern America \ CAN \ Alberta


4r place, 4r source, 4r time, nutrient management


Nitrogen (N)