Comparison of Raw Dairy Manure Slurry and Anaerobically Digested Slurry as N Sources for Grass Forage Production

Table 7

Apparent nitrogen recovery (ANR) in harvested forage as percentage of total and ammonium N applied, 2010 and 2011.

	ANR 2010		ANR 2011
Treatment	% of Total N	% of NH4^+–N	% of Total N	% of NH4^+–N
Urea	65	65	31	31
Raw-subsurface	29	60	15	35
Raw-broadcast	34	70	24	47
Digested-subsurface	30	52	23	53
Digested-broadcast	40	70	20	46

Urea fertilizer considered equal to NH₄⁺ in plant availability.