Runoff and Nutrient Losses from Constructed Soils Amended with Compost

Table 4

Total runoff and the sum of mass loss of runoff sediment and associated total P and N over 10 rain events during grass establishment on roadside slope amended with composted dairy manure (CDM) and composted municipal biosolids (CMB). See Table 2 caption for description of treatments.

Treatment	Compost	Rate	Runoff		Sediment		Total P		TKN
		(m^3 m^−3)	(mm)		(g m^−2)		(mg m^−2)		(mg m^−2)
Control	NA	NA	156	bc	111	cd	328	c	115	b
CMT	CDM	0.125	194	ab	525	b	361	c	554	ab
CMT	CMB	0.125	178	ab	398	b	439	bc	1373	a
CMT	CDM	0.25	206	a	872	a	646	b	1380	a
CMT	CMB	0.25	168	abc	469	b	454	bc	664	ab
ECC	CDM	0.50	178	ab	44	d	965	a	60	b
ECC	CMB	0.50	137	c	11	d	681	b	16	b

^†Different letters in columns represent significant differences using Fisher’s LSD means separation test.