Grey spots on oats are caused by the deficiency of which element?

  • A
    $Fe$
  • B
    $Cu$
  • C
    $Zn$
  • D
    $Mn$

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Which mineral elements cause stunted growth when deficient?

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Deficiency symptoms of mineral elements appear first in young leaves. - $P$
Deficiency symptoms of mineral elements appear first in senescent (older) leaves. - $Q$
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