Nitrogen (N) rate on-farm trial in field with hog manure applied in early August the previous year. The 16-row strips that are the most yellow-green only received 30 lbs N / acre as starter fertilizer and no sidedress N application. The economic optimum N rate for the trial turned out to be 147 total lbs of N applied per acre, with an average yield of 234 bushels / acre. Photo taken 14 August. (Source: Bob Nielsen, DJI Zenmuse X4S camera on DJI Matrice 200 UAV at 400 ft flight altitude.