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JAMB Biology 1989 Question 47

Question 47

Soil

Most irrigated lands often become unproductive in later years because of

  1. A.loss of fertility
  2. B.increase in salinity
  3. C.soil erosion
  4. D.loss of water
Show the answer and explanation

Answer: B (increase in salinity)

Explanation

Irrigation water evaporates and leaves its dissolved salts behind, so salt builds up in the soil (salinisation) and crops fail.