Effect of acidifying amendments on P availability in calcareous soils

Abstract Phosphorus (P) reactions in calcareous soils limit the concentration of P soil solution for plant uptake. Calcareous with high calcium carbonate content (CaCO 3 ) and pH have low fertiliser efficiency, leading to crop deficiency limited productivity. The aim this work was test if acidifying amendments could reduce improve solubility nutrition biomass. Three varying CaCO (14–29% w/w) were used both without mono-ammonium phosphate (MAP). Soil amended oxalic acid, sulfuric glucose, ammonium sulfate elemental sulfur (S 0 ). Initial titrations demonstrated ability acids all three soils. Incubation lowest over 14 days (52 S showed increased diffusion from MAP granules acid acid. There was, however, no improvement uptake wheat crops grown these highly