Laboratory, greenhouse, and field experiments were conducted to determine the effects of a tailings material and a magnesium ammonium phosphate (mgap), produced from a ni refining operation, on plant growth and soil properties. The tailings contain high levels of soluble salts (9.7 Mmhos/cm), nh4-n (0.1%), Total ni (2,470 ug/g), cr (3,825 ug/g), and CO (313 ug/g), and low levels of ca (1.3 Meq/100 g) and extractable p (1.0 Ug/g). Tall fescue (festuca arundinaceae s.) was grown on soils amended with tailings and plant yield and elemental composition was determined. The mgap was compared with mgnh4-po4 (mgkap) and traditional fertilizer as sources of n and p for tall fescue and white clover. Tall fescue established slowly on soils amended with the highest rate of tailings while other plants grew well. Concentrations of mn, ni, cr, and CO in tall fescue grown on the treated soils were within normal ranges. The tailings should be leached further to reduce the (nh4)2so4 content to allow better stand establishment at high tailing application rates. All fertilizer materials provided similar levels of n and p, as evidenced by plant yield and elemental content.