Here's a link to a great article you guys might find interesting. Check out the mention of sentinel corn (a non gmo corn variety that turns bright red when it needs water thus eliminating guesswork and seriously lessening water consumption among farmers). This stuff is also unpattentable also which makes it even better.
http://www.wired.com/wired/archive/12.05/food.html
http://www.wired.com/wired/archive/12.05/food.html