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Water extractable phosphate in composts and land-applied organic materials
Link to this table.

Feedstock	Biosolids treatment	Total solids(%)	pH	P2O5 (% dry wt)	P (% dry wt)	WEPa(% of Total P)
Leaf / yard wastes	NA	39.4	7.7	0.34	0.15	8.4
Leaf / yard wastes / food	NA	47.5	7.4	0.42	0.18	7.4
	NA	53.9	7.4	0.43	0.19	6.8
Biosolids / wood chips2	No P removal	39.8	7.2	0.78	0.34	20.5
	An. digest /No P removal	59.2	7.2	1.87	0.82	7.7
	No P removal	48.1	6.7	1.6	0.7	22.3
	Chemical P removal	38.8	5.5	3.65	1.59	1.8
Biosolids / wood chips / yard wastes2	No P removal	72.1	6.6	0.81	0.35	12.2
Biosolids / yard wastes / WTRb2	No P removal	53.5	8.3	1.67	0.73	4.6
	No P removal	47.8	7.9	1.68	0.73	4.1
Leaf / yard wastes / gelatin residuals	NA	51.1	8.3	2.19	0.96	2.0
Biosolids / wood shavings2	Biological P removal	42.8	5.7	2.41	1.05	13.3

^aWEP = Water extractable phosphorus, bWTR = water treatment residuals (Source: Phosphorus and Compost Use Dynamics, Alexander, 2016)
²Minnesota does not compost biosolids per rule. Only source separated organic matter and yard waste are allowed in compost.