From: Effectiveness of ecotechnologies in agriculture for the recovery and reuse of carbon and nutrients in the Baltic and boreo-temperate regions: a systematic map
C
P
N
C and P
C and N
P and N
C, P and N
Manure-based
3
18
20
1
7
26
23
Crop-based
4
8
6
Manure- and crop-based
2
5
19
Other
Number of studies
10
22
35
39
51