Wheat has already reached green-up across the state so spring N may be applied anytime fields are fit. Keep in mind that research has shown N can be applied up to Feekes GS 6 (one visible node) without a reduction in yield. However, wheat is growing slowly because of the cool temperatures, particularly in northern Ohio. Nitrogen applied early has the potential to be lost since wheat will use little N prior to jointing (Feekes GS 6). Urea-ammonium nitrate (UAN) or 28% has the greatest potential for loss and ammonium sulfate the least.