Which of these is NOT a method of improving crop yield?

Which of these is NOT a method of improving crop yield?
  • A.
    spraying the crops with chemicals
  • B.
    mechanized farming
  • C.
    sowing pest resistant varieties of seeds
  • D.
    storing the crops in barns or silos
  • E.
    sowing of viable seeds
Correct Answer: Option D
Explanation
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