Identical field studies were established near Stuttgart and Colt, Arkansas. Soil pH was raised to 7.4 with ag lime, and excessive P (300 lb P₂O₅/A.) was applied to silt loam soils (Mehlich 3 Zn < 1.5 ppm) at both sites to increase the likelihood of Zn deficiency. Four Zn sources [CoZinco 31 percent Zn, RSA Microtech 10 percent Zn, Frit 20 percent Zn (F20), and Frit 36 percent Zn (F36)] were compared at 0, 2, 4, 8, 12, and 16 lb Zn/A. Post-harvest Mehlich 3 soil Zn increased incrementally with Zn rate. All Zn rates and sources produced yields numerically greater than the control (6,179 to 6,592 > 5176 lb/A).