TABLE 2.

Macro-element composition used to assess the combined effect of buffer concentration and C:N:P on growth.

C (gC.L–1)	Acetate (g.L–1)	Butyrate (g.L–1)	N-NH4 (mgl.L–1)	P-PO4 (mgl.L–1)	C:N:P (molar)	Buffer capacity (mM)
1	2.5	-	105	15	83:7.5:1	0
	-	1.6
1	2.5	-	175	15	106:16:1	0
	-	1.6
1	2.5	-	105	15	83:7.5:1	20
	-	1.6
1	2.5	-	175	15	106:16:1	20
	-	1.6
1	2.5	-	105	15	83:7.5:1	100
	-	1.6
1	2.5	-	175	15	106:16:1	100
	-	1.6
2	5	-	105	15	166:7.5:1	0
	-	3.2
2	5	-	350	30	106:16:1	0
	-	3.2
2	5	-	105	15	166:7.5:1	20
	-	3.2
2	5	-	350	30	106:16:1	20
	-	3.2
2	5	-	105	15	166:7.5:1	100
	-	3.2
2	5	-	350	30	106:16:1	100
	-	3.2