One of the disadvantages of corn is that it doesn't "trade" (sell) for as much money as other crops. This point became clear in this [question:][1] 

On the other hand, corn is cheaper to produce than other crops, and you don't need to build a production facility for it. And corn can be shipped for as many victory points as other crops.

Does it make sense to go for higher yielding cash crops in the beginning, use the money to buy the buildings you need (or want), and then shift to producing corn (for the victory points) about mid-game?

[1]:https://boardgames.stackexchange.com/questions/1059/is-there-a-viable-corn-only-strategy-for-puerto-rico?rq=1