Effect of Chloride on Phosphorus Uptake by Corn Roots¹

A study was made on the effect of KCl on P uptake by 20‐day‐old corn seedlings grown in water culture and 4‐day‐old excised corn roots grown on 0.2 mM CaSO 4 solution. All P solutions were adjusted to pH 4. Those used for excised roots contained 0.2 mM CaSO 4 and those used for 20‐day‐old corn seedlings contained 1.2 mM KNO 3 , 0.8 mM Ca(NO 3 ) 2 , and 0.4 mM MgSO 4 . One‐hour absorption periods using concentrations up to 0.l M KCl showed no effect on 32 P uptake from 2 to 260 µM KH 2 PO 4 solutions with either type of plant material.