Table 5 Number of studies per type of recovery and type of ecotechnology based on recovery source
| 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 | 1 | 8 | 1 | 6 | 3 | 6 |
| Manure- and crop-based | 2 | 2 | 5 | 5 | 6 | 19 | |
| Other | 1 | 1 | 2 | 4 | 3 | ||
| Number of studies | 10 | 22 | 35 | 2 | 18 | 39 | 51 |