Tyler Troiola used John Deere See & Spray Premium for the first time. The retrofit kit uses 36 cameras and machine learning to selectively target spray weeds. Troiola used it on corn at 10 inches, 14 inches and 18 inches. When corn was 10 inches tall, he says See & Spray only sprayed about 18% of the field, which adds up to over 80% in herbicide savings. It went down to about 70% savings on 14-inch-tall corn, and 60% savings on 18-inch-tall corn.