In this Oct. 21, 2013 photo, Tony Pouliot demonstrates the goCrop app on his mobile photo in the cab of his combine on his farm in Westford, Vt. Farmers can now use smart phones and computers to monitor and modify what nutrients they add to their soil, thanks to the new computer app created by a University of Vermont researcher. More than 50 Vermont farmers are now using goCrop, created with help from $400,000 grant, and farmers in other states are about to take advantage of the new tool. (AP Photo/Toby Talbot)
