Possible Clues:

• Where in Greece you get something for the farmer with the soil on the hill
• There's something for the farmer with the soil that's mixed at Athens
• A harvest store erected in the citadel
• What the farmer reaps, with the help of the soil of Greece
• It's for the farmer to get at hens, perhaps, with a mixture of soil
• What the farmer gets with the mixed soil of Greece?
• What the farmer might reap from the soil of Greece with safety
• Citadel produces yield in a poor soil
• What a farmer wants to get from soil at hens there
• Something grown on poor soil in citadel