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A farmer finds soil pH to be 9. Why may adding organic manure be advised?

Answer and explanation

Correct answer: Mild acidic substances formed on decomposition can reduce basicity

A pH of 9 indicates that the soil is alkaline. During decomposition, organic manure can produce humus and various weakly acidic substances. These may react with or buffer some alkaline components, helping to reduce excessive basicity and improve soil conditions. The change is gradual and does not make the pH zero. Organic manure does not turn soil into metal and does not only increase alkalinity. Therefore A is correct.

Related tags

Basic SoilOrganic ManureSoil PhSoil ImprovementAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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