| Correlative | Manipulative | Correlative and manipulative | Total |
---|---|---|---|---|
Organic | 117 | 27 | 2 | 144 |
Conventional | 112 | 39 | 2 | 151 |
Integrated | 20 | 28 | 0 | 48 |
Organic versus conventional farm management | 89 | 14 | 2 | 103 |
Organic versus conventional versus integrated farm management | 11 | 4 | 0 | 15 |
Integrated versus conventional farm management | 3 | 17 | 0 | 20 |
Organic versus integrated farm management | 6 | 2 | 0 | 8 |