Step 1: Concept
Conservation tillage aims to minimize soil disturbance to reduce erosion and save energy.
Step 2: Meaning
The system involves no primary or secondary tillage operations between crops.
Step 3: Analysis
In zero tillage (also called no-till), the only soil disturbance occurs during the planting process where a narrow slot is opened for the seed. The rest of the field remains covered by residue from the previous crop.
Step 4: Conclusion
This system is defined as zero tillage.
Final Answer: (B)