Abstract:Indoor incubation and bathe equilibrium experiment were conducted to investigate the stability of aluminum (Al) in three Al-containing mineral conditioners and their amelioration on the acidity of soil. The mineral conditioners consist of a mixture of calcined product include potassium feldspar, dolomite and limestone powder which rich in available Ca, Mg, K, Si and other micronutrients. Results showed that soil pH value rose from 4.98 to 5.04 – 5.42 and exchangeable Al decreased by 37.40% – 68.90% after 60 days when the dosage was 0.5 – 2 g/kg soil. Even though the adsorbent hydroxyl Al increased slightly, the total toxic Al and available Al decreased by 5.37% – 9.50% and 4.33% – 12.08%, respectively. Results also suggested that exchangeable Ca, Mg, K and available Si increased, and Al concentration in the filtrate under simulated acid rain decreased significantly, which indicated that the mineral conditioners could neutralize soil acidity, eliminate Al toxicity and improve the soil fertility, and could be used in agricultural production safely due to the high stability of Al in conditioners and additive of Al toxicity avoided.