The effect of sodium on growth and potassium deficiency symptoms in water convolvulus (Ipomea aquatica, Forsk.)

Abstract

Water convolvulus, Ipomea aquatica Forsk., was grown in nutrient solution with three concentrations of sodium and potassium, each ranging from deficient to sufficient. All other nutrients were supplied in adequate quantities. Both potassium and sodium increased plant growth, however, the response to sodium was greatest when potassium was deficient. Evidence of a sodium response makes the accepted practice of balancing potassium with sodium in solution culture studies most questionable. Sodium should not be considered a non‐nutrient in water convolvulus.

Key words:

• Sodium
• potassium
• solution culture
• Ipomea aquatica

Notes

Formerly graduate assistant, Vegetable Crops Dept. Cornell University, Ithaca, N.Y. 14850.