How does tillage affect soil structure?

• A. It always improves soil health by adding nutrients
• B. It can break down aggregates and lead to compaction
• C. It has no effect on soil structure
• D. It enhances water retention in all types of soil

Answer: (B)

Tillage significantly influences soil structure, primarily by its capability to break down soil aggregates and lead to compaction. When soil is tilled, the mechanical action can disturb the natural arrangement of soil particles, disrupting the aggregates that are essential for healthy soil structure. This disruption can make the soil more susceptible to compaction, which occurs when soil particles are pressed together, reducing the pore spaces that are critical for water retention and root penetration.

In addition, excessive tillage can degrade the soil's physical properties over time, resulting in diminished aeration and poorer drainage. These factors collectively contribute to a decline in soil health, impacting its fertility and the overall ecosystem. Therefore, understanding the effects of tillage on soil structure is crucial for implementing sustainable agricultural practices.