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Agronomy QUESTION #2086
Question 1
An ideal seedbed for small-seeded crops (wheat, canola) must achieve which combination of physical characteristics?
  • Deep (30+ cm), fine, loose structure with maximum air pore space
  • Firm at depth for capillary water supply to germinating seeds, fine and friable at the surface (clods < 5–10 mm), level for uniform sowing depth, and free from large clods that create air pockets around seeds causing poor seed-soil contact✔️
  • Saturated with water to maximum field capacity before sowing
  • Rough and cloddy to prevent wind erosion of the seedbed before germination
Correct Answer Explanation
Small seeds have limited food reserves — they need intimate seed-soil contact for water imbibition (capillary supply from firm subsoil), precise sowing depth (1–3 cm), and fine tilth for rapid, uniform emergence. Large clods create air gaps around seeds, disrupting water supply. However, over-pulverization destroys structure, causing surface crusting that impedes seedling emergence.