 Phosphorus, on the other hand, doesn't go into the plant well through leaf tissue, so we like to see that addressed in the soil. The other big key is to spray earlier rather than later. Yes, late-season foliar feeding like nitrogen on wheat that's headed out or corn that's tasseled out can pay, but you never want your crop to run short on nutrients. Finally, keep your costs low, because while yield gain or protein increase is possible, we almost never see huge gains. With today's Ag PhD Radio Update, I'm Darren Hefty.