Step 1: Understanding the Concept:
Conservation tillage is defined as any tillage and planting system that maintains at least 30% residue cover on the soil surface after planting to reduce water and wind erosion.
Step 2: Detailed Explanation:
Zero tillage (no-till) is the purest form of conservation agriculture, where the crop is seeded directly into untilled soil and residue mulch of the previous crop.
The zero till drill (equipped with inverted-T or double-disk openers) cuts a narrow slot in the residue-covered untilled soil, deposits seed and fertilizer, and covers the furrow in a single pass without prior seedbed preparation.
Step 3: Final Answer:
Therefore, Zero till drill is considered under conservation tillage, matching option (B).