The Effects of Triiodobenzoic Acid and Urea on the Response of Chlorotic Lemon (Citrus Limonia) Trees to Foliar Application of Iron Compounds.

Abstract

The effects on utilization of foliar applied radioactive FeCl3 of triiodobenzoic acid (TIBA) to foliage or to roots of chlorotic citrus trees was investigated. No beneficial effects either on penetration or mobility of the applied iron could be detected. The application of 2% urea in conjunction with ferric chloride or ferrous sulphate resulted in more uniform chlorophyll production. Urea did not promote movement of iron across or between leaves. Combined use of urea and TIBA showed no improvement over urea alone. It is concluded that urea promotes the more uniform penetration of iron applied to the leaves.