Why did the farmer make a deal with the devil?

The farmer made a deal with the devil, because the devil said he was sitting on the treasure, and the farmer felt that the things in his field should be his own. So the farmer made a deal with the devil. The devil said, two years, you give me half of the harvest in the field, and I will give you the treasure. The land belongs to the devil and the land belongs to the farmer. In the first year, the clever farmer planted radish, but the devil found nothing. The devil was unconvinced and changed the agreement, demanding the next year. On the contrary, the land belongs to himself and the farmers above it. As a result, the farmer planted wheat the next year.