Consider the following practices:

1. Minimum mechanical disturbance of the soil through minimal or zero tillage

2. Maintaining a permanent covering of the soil surface using crop residues or cover crops

3. Diversifying crop species grown in sequences or associations, both across space and over time

4. Complete avoidance of growing any single crop as a monoculture

5. Exclusion of plantation crops from any conservation agriculture system

Which of the above are recognised pillars of conservation agriculture?