Net Assimilation Rate and Growth Behavior of Beans as Affected by Gibberellic Acid Urea and Sugar Sprays

Abstract

Gibberellic acid increased net assimilation rate, relative growth rate, stem dry weight, leaf area, and plant height. Root dry weight was reduced and leaf (Iry weight was not significantly altered. Reduction in root dry weight induced by gibberellic acid could be effectively controlled by 10 % sucrose sprays. In- crease in net assimilation rate (photosynthesis) cause(l by gibberellic acid seemed to result from a more rapi(l translocation of photosynthates from the leaves to the stem. Urea sprays increased stem elon- gation of plants receiving gibberellic acid. Both sugar an(l gibberellic acid were effective in protecting, against inijury by 2 % urea spray.