Effect of K or K/Ca on soluble iron expressed from alfalfa shoots

Abstract

Sap expressed under pressure from the shoots of alfalfa (Medi‐aago sativa L. cv" Ranger) contained higher Fe concentrations when the alfalfa had been grown at high K than at low K concentrations. When K was high, Ca and Mg were low. In lime‐induced iron chlorosis, leaves generally have increased K and decreased Ca concentrations; so it was suggested that when under Fe stress, some plants may use this as a mechanism to increase the efficiency of Fe in plants.

Key words:

• Active iron