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WAEC Agricultural Science 2015 Question 17

Question 17

Soil Fertility and Plant Nutrition

If a farmer continuously applies sulphate of ammonia to his farmland for many years, the resultant soil solution is most likely to

  1. A.leave blue litmus paper unchanged.
  2. B.change blue litmus paper to red.
  3. C.change red litmus paper to blue.
  4. D.be rich in soil microbes.
Show the answer and explanation

Answer: B (change blue litmus paper to red.)

Explanation

Sulphate of ammonia is an acid-forming fertilizer, so the soil becomes acidic and turns blue litmus red.