A field experiment was conducted at the Postgraduate AgriculturalResearch Station (PARS), University
of Agriculture, Faisalabad to evaluate the effect of an auxin, indole-3- acetamide (lAM) and its
precursor L-tryptophan (L-TRP), on the growth and yield of rice (cv. Basmati-385). Rice seedlings were
treated with different levels of L-TRP (10-2 to 10-6 M) and lAM (10-:Jto 10-9 M) by dipping the roots in
respective solution for one hour just before transplanting them into the field. In case of control, roots were
dipped in tap water for the same period of time. Both the pure auxin and its precursor significantly
enhanced the yield and NPK contents of rice compared to untreated control. L-tryptophan application @
10-5 M significantly increased the plant height (4.3c.kI), paddy yield (42.9%), number of tillers (29.7%), and c.
number of panicles (28.5%), compared to control. The same level of L-TRP also significantly improved NPK
contents of rice.