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Agronomy QUESTION #2087
Question 1
The rotary tiller (rotavator) achieves seedbed preparation in a single pass because:
  • It uses static tines that shatter soil through vibration
  • Powered L-shaped blades rotate at high speed (200–300 rpm), simultaneously cutting, pulverizing, and mixing soil — achieving fine tilth from crop residue conditions in one operation, saving time and fuel compared to conventional plow-harrow-level sequences✔️
  • It uses gravity-fed discs to break clods progressively
  • It injects water under pressure to disperse soil aggregates
Correct Answer Explanation
The rotavator's powered rotating blades (PTO-driven) cut and repeatedly strike soil, pulverizing clods and incorporating residues in a single pass. In South Asia's rice–wheat system it reduces tillage time from 10–15 days (conventional) to 1–2 days, critical for timely wheat planting. Limitation: overuse damages soil structure and increases energy consumption vs. strip tillage.