The interrelationship of iron and potassium in water convolvulus (Ipomea aquatica, Forsk.)

Abstract

Water convolvulus, Ipomea aquatica Forsk., was grown in nutrient solution with four concentrations of iron and four concentrations of potassium ranging from deficient to sufficient. All other nutrients were supplied in adequate quantities. When the iron supply was marginal, low potassium levels in the solution produced plants with interveinal chlorosis on the young leaves characteristic of iron deficiency. Potassium level had no effect on either total or active iron concentrations of the chlorotic leaf tissue. Foliar sprays of iron prevented the interveinal chlorosis at all potassium levels.

Key words:

• Iron
• potassium
• Ipomea aquatica
• tissue test
• solution culture

Notes

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