The N calculator – included in a single app including corn, spring wheat/durum, and sunflower – is now available for download onto iPhones and iPads. Search the Apple store for “North Dakota Crop Nitrogen Calculator” and install. Once installed, select the crop and follow instructions. The original NDSU circular document for each crop is also available on the app. The app is also available for Android phones in the “Google Play Store” – again, search for “ND Crop Nitrogen Calculators” and install.