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

Table 3

Annual mean N and P concentrations of raw and anaerobically digested slurries applied to pasture plots.

	2009		2010		2011
	Raw dairy	Digested	Raw dairy	Digested	Raw dairy	Digested
	Slurry	slurry	slurry	slurry	slurry	slurry
Percent Total Solids (%)	2.8	1.9	3.4	2.0	3.4	1.4
Total N, mg kg^-1a	1441	1617	1653	2672	1475	2000
NH4–N, mg kg^−1	707	1038	776	1253	760	930
Organic N, mg kg^-1b	734	578	877	1419	715	1070
Total P, mg kg^−1	350	300	331	292	330	210

^aN and P concentrations reported as is.
^bOrganic nitrogen (N) = total N − NH₄–N.