Possible Clues:

• Fort gets a harvest on poor soil
• A harvest with poor soil in Greece
• A harvest on new soil in ancient Greece
• What a farmer will get with the soil of 26 down
• What the farmer gets on the soil above 26 down
• The farmer gets something on the soil of 27 down
• A tower, round, with collection inside?
• For the farmer, a living at Athens with soil like that
• Citadel of an ancient Greek town
• What may be rice and grain store over in old citadel