1. Does Maize Need Pre-Plant N if Sub-Drip Fertigation Can be Used To Provide Season Long N?

Multiple nitrogen (N) applications are becoming more common as a way to assure adequate N availability for optimum growth and yield of maize (Zea mays L.), while minimizing the potential for negative environmental consequences associated with N loss. Unclear, however, is how much N needs to be applied at planting in order to get the full value of in-season applications. Our objectives were to determine the amount of preplant N needed to maximize maize yield, when additional N is provided... B. Wiegmann, F. Below