ABSTRACT The reasearch to have know the effect of mature of coffe seed (Coffea canephora, Pierre) var Robusta Klon BP 42, an experiment on done since July, 1991 up to September 1991 at Sumber rejo Magelang, Central java. The experiment was analyzed in factorial, wich to com- pletely Randomized Design (CRD), consisted of two factor and 3 replication. The first factor was …