Taz,
Careful about putting down fertilizer where you already have a greened up food plot. Especially if the fertilizer has high levels of Nitrogen- as this will burn up your already "greened up" forage. I would look for the 10-10-10 and then wait until you KNOW it's going to rain (or raining) and then go in and put some down. This way, you know it will get worked into the soil in the plot immediately, rather than sitting on your plants and burning them up. If the "20" or "27"in the fertilizer you're thinking of using is Nitrogen- STAY AWAY from using it on any plot that already has greened up.

Just my .02 cents....... there are guys here with lots more experience than me- if I'm off base with this advice, please someone- tell me.

Rob