Explain the term - hydrolysis yield ammonium ion, Science

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Explain the term - hydrolysis yield ammonium ion

In addition to ammonium compounds, materials such as urea which, upon hydrolysis yield ammonium ion, are again a potential source of acidity.  The phosphorus and potassium fertilizers commonly used have little effect on soil pH unless they also contain nitrogen.   The appropriate acid forming capacity of some fertilizer materials expressed in kg of CaCO3 needed to neutralise the acidity produced by 100  kg nitrogen supplied are as given below: 

 

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