Fertilization of Extremely Grazed and Moderately Grazed Mixed-Grass Prairie with Slow Release Phosphorus and Urea

J. M. Volk, W.T. Barker, P. Nyren and D. Whitted

NDSU Animal and Range Sciences Department, and Central Grasslands Research Extension Center

Table of Contents


Many studies have reported on fast release nitrogen and phosphorus fertilization of rangeland, but few have reported on slow release fertilizers or changes in botanical composition as a result of fertilization, which may be as important as changes in forage production. Response of extremely and moderately grazed mixed-grass prairie vegetation to annual applications of slow release phosphorus (P) and slow release urea (N) was studied during a four-year period at the Central Grasslands Research Extension Center (CGREC) near Streeter, North Dakota. Fertilizer rates of 0, 24, and 48 pounds/acre of elemental P were applied May 1 and June 20. Fertilizer rates of 33 and 66 pounds/acre of elemental N were also applied June 20. Both the phosphorus and nitrogen fertilizers are slow release fertilizers encapsulated with a synthetic polymer.


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