A research on effect status physiology of rootstock and application of plant growth regulator on successfulness wedge grafting of cassava (Manihot esculenta Crantz) was conducted in Ngasinan village, sub district Wonogiri, district Wonogiri from June to September 2008. The experiment was designed in Random Complete Block with three replications. Treatments trialed were 9 combinations of rootstock (lower stem, middle stem and upper stem) and growth regulator degree (0 ppm, 2500 ppm dan 5000 ppm).
A rootstock was used come from cassava UJ-5 variety. It divided into three parts that have a same length (lower stem, middle stem and upper stem). From each parts it is taken 25 cm as plant material, therefore it is immersed into Rhizattun (merck) solution during 10 minutes. Rootstock is planted on field (rooting) with 5 cm – 10 cm deep and plant spacing 10 cm x 20 cm, until 7 weeks after it is planted. Observation collected until 8 weeks after it is grafted.
The research resulted: (1) There is no interaction between rootstock and growth regulator treatment except parameter of leaf quantity (sheet) in 7 weeks after it is planted, (2) Treatment of plant material (lower stem) result the lowest percentage of dead plant not only before grafted (7 weeks after it is planted) but also after grafted (15 weeks after it is planted or 8 weeks after it is grafted), (3) Plant growth regulator degree (0 ppm, 2500 ppm and 5000 ppm) not significantly affected on parameter of dead plant not only before grafted (7 weeks after it is planted) but also after grafted (15 weeks after it is planted or 8 weeks after it is grafted).
Key words: plant growth regulator, status physiology of rootstock, cassava, wedge graftingArindiko, Ridho

