BAKERSFIELD, Calif. (AP) _ United Farm Workers President Cesar Chavez was in the hospital today for injuries sustained when he fell eight feet from his porch to the ground, a union spokesman said.

Chavez, who was working at his home Sunday at the UFW headquarters in Keene when the hand rail on his porch gave way, suffered a fractured right wrist and bruises to his head, chest and back, said his son Paul Chavez.

''He's doing fine awaiting test results,'' said John Theilen, another UFW spokesman, who was at the Kern County Medical Center late Monday. Theilen said Chavez would remain at the hospital at least through today for observation.

The 62-year-old union leader has been recuperating from a 36-day long water-only fast he ended Aug. 21. Chavez fasted in protest of pesticides used in California agriculture and called for a boycott of table grapes.