(Disclosure: I work for ICIS: About ICIS)
The piece is written for two big issues: fertilizers and food. It misses a third, biofuels. If the crop is bad then the price of corn will rise, if the price of corn rises then the economics of non-integrated ethanol producers is going to look pretty shaky (if it doesn't already).
If you want to hedge your biofuels position, it might be a good idea to buy into fertiliser firms (OK so I don't do stock recommendations being (a) unqualified and (b) not a bookmaker) but the capitalisation of fertiliser firms has been growing nicely over the past year, according to David's piece.