ABSTRACT The research concerning the influence of Kinds of Plant Growth Regulator and its Time of Application to the Yield of Broccoli (Brassica oleracea var. botrytis L. subvar. cymosa Lam.), to find out the most suitable kind of plant growth regulator and its time of application in broccoli cultivation. The research had been carried out on April 25th 5th to June 20th 1994, at Potrobangsan Vi…