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WAEC Agricultural Science 2011 Question 27

Question 27

Soil Fertility and Plant Nutrition

Yellow colouration of the lower leaves of a growing maize plant may be due to deficiency in

  1. A.potassium.
  2. B.phosphorus.
  3. C.zinc.
  4. D.nitrogen.
Show the answer and explanation

Answer: D (nitrogen.)

Explanation

Nitrogen moves from old to young leaves, so lower leaves turn yellow first.