The acidity of alfisols and ultisols may be unfavorably increased for blueberry production by the use of specific nitrogen (N) fertilizers. Several ammonium containing fertilizers were evaluated for their effects on rabbiteye blueberries (Vaccinium asheiReade). Rooted ‘Tifblue’ cuttings were grown in a 1: 1 peat: Lilbert loamy fine sand mix for 90 days. After establishment, plants were moved into the glasshouse and fertilized four times at 90‐day intervals with one of six N sources at one of four rates. Nitrogen sources were (NH4)2SO4(AS), NH4NO3(AN), urea, urea‐NH4NO3(UAN), Nitro‐form (NF) and sulfur coated urea (SCU). Rates of N per application were equivalent to 0, 112, 224, or 336 kg/ha. The application of the high rate of each N source reduced plant growth. The 112 and 224 kg/ha N treatments increased growth compared to no nitrogen treatments. When comparing N sources, SCU treatments produced the greatest plant growth and AS treatments the lowest. Sulfur coated urea had less effect on soil pH and Al than other sources. Poor growth with AS was caused by the combined effects of decreased soil pH, increased soil electric conductivity (EC) and increased exchangeable aluminum. Plant leaf N increased with increasing N rate. Nitrogen sources which produced the greatest plant growth had the lowest N levels.