The effect of potassium fertilization on iron deficiency

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Abstract
Preliminary experiments indicate that K fertilization at a rate of 270 mg K/kg soil ameliorates Fe deficiencies in peanuts [Arachis hypogaea] grown in an extremely calcareous soil (63% CaCO3). Amelioration was greater with the application of KCl than with that of KNO3 or K2HPO4, indicating that the cation:anion balance of root uptake is involved. KCl application caused a 73% increase in the FeEDDHA treatment. Manipulation of the cation: anion balance of macronutrients may prove to be an effective means of controlling lime-induced chlorosis.