Nucleus O-Phos NPK Zn (7-21-2 0.1 Zn) is a neutral pH formulation that gives your emerging crop a head start on growth, while improving stand uniformity. By providing key nutrients, it enhances plant health and can potentially result in an earlier harvest from enhanced growth after planting. Nucleus O-Phos can be applied in furrow, 2 x 2, through drip tape or center pivot application. Contains EDTA Zinc Chelate.