10.2 Fertilisers
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13. Name the two types of salts used as fertilisers mentioned in the syllabus.
Ammonium salts (containing the NH4+ cation, like ammonium sulfate) and nitrates (containing the NO3- anion, like potassium nitrate).
14. What are NPK fertilisers?
Commercial formulation mixtures designed to simultaneously deliver three critical macronutrients to soil profiles: Nitrogen (N), Phosphorus (P), and Potassium (K).
15. Why are NPK fertilisers used in agriculture?
To replenish depleted soils with specific essential macroelements, accelerating leaf synthesis, strong root development, and overall crop yields.