Optical sensors are seen installed at a tractor in a wheat field in the Bavarian town of Irlbach
Optical sensors, Trimble Navigation Ltd’s 'GreenSeeker' devices to instantly adjust nitrogen fertilization, are seen installed at a tractor in a wheat field in the Bavarian town of Irlbach near Deggendorf, Germany, April 21, 2016. REUTERS/Michaela Rehle TPX IMAGES OF THE DAY