When the pH falls below 6 the availability of nutrients such as Phosphorus, Potassium and Magnesium decreases and availability of the Micro-nutrients like Zn, Mn, Cu, Fe increases.
Both Chemical and Organic Fertilizers may eventually make the soil more acidic. Hydrogen is added in Ammonia (NH4+) based fertilizers or Urea based fertilizers [CO(NH2)2] and as proteins (Amino Acids) in Organic Fertilizers.
Transformation of these sources of Nitrogen into Nitrate (NO3-) releases Hydrogen to create soil acidity.
FACILITATE THE AVAILIBILITY OF MAJOR NUTRIENTS NPK AND THE MICRO-NUTRIENTS
Reduction in Soil Toxicity,Increment in Soil Fertility And Reduction in Soil-born Pathogens Reduction in Alkalinity of Soil(High pH to normal pH ) Increment in water holding capacity Rehabilitation of unproductive soil (Unproductive soils like Banjar, Usar, Mind Areas, Over burdens and Brick Kilns could be quickly converted in to productive fertile land).