Short-Term Effects of Biogas Digestates and Pig Slurry Application on Soil Microbial Activity

Table 3

Chemical and physical characteristics of the four different biogas digestates (BD-A, BD-B, BD-C, and BD-D) and pig slurry (PS) used in the experiments.

Parameter	BD-A	BD-B	BD-C	BD-D	PS
pH	7.9	7.9	8	8.7	6.6
Dry matter, DM (%)	6.1	3.7	1.7	5.9	9.1
Tot-C (g kg^−1 ww)	19	9	7	24	40
Tot-N (g kg^−1 ww)	7.9	5.9	2.6	5.3	5.3
Org-N (g kg^−1 ww)	2.6	2.2	0.6	2.0	2.9
-N (g kg^−1 ww)	5.3	3.7	2.03	3.3	2.4
C/N	7.1	4.2	11.0	12.1	13.6
Tot-P (g kg^−1 ww)	0.9	0.7	0.2	0.4	1.4
K (g kg^−1 ww)	1.6	2.8	1.1	3.7	2.5
S (g kg^−1 ww)	0.60	1.22	0.12	0.26	0.47
Mg (g kg^−1 ww)	0.2	0.1	0.1	0.3	0.6
Ca (g kg^−1 ww)	0.6	0.1	0.3	1.3	1.7
Cr (mg kg^−1 ww)	13.0	14.9	11.1	19.5	10.7
Mn (mg kg^−1 ww)	201	266	91.8	286	426
Ni (mg kg^−1 ww)	38.8	35.5	1.7	1.7	39.6
Cu (mg kg^−1 ww)	69.7	69.4	39.8	97.4	218
Zn (mg kg^−1 ww)	474	465	299	395	801
Cd (mg kg^−1 ww)	0.3	0.3	1.2	0.3	0.3
Pb (mg kg^−1 ww)	0.1	0.7	4.6	3.4	0.1
Hg (mg kg^−1 ww)	<0.1	<0.1	<0.1	<0.1	<0.1

ww = wet weight.