Coconut palm replacement model for Tanzania farming systems
Mwinjaka, S;|Chiduza, C;|Temu, A.E;|Sukume, C.;|Dichl, L. / 1999

The major contributing factor to low and constanly declining productivity of coconut palm worldwide is senililty. Over 75% of coconuts in Tanzania are more 45 years old,and amongst these there many above 60 years. This affects productivity negatively. It is possible to improve yield from coconut palm field by applying and appropriate replacement strategy. This paper presents results of a mathematical model aimed at determining the appropriate replacement time for coconut palms in coastal Tanzania. Data was collectedf from Tanga, Coast and Dar es Salaam Region. A total of 592 palms were assessed and their yield estimated. Linear regression aquations suggest a production pattern where there is a low yield pick-up in the early ages (10-20 years) it increases at a fast rate in the intermediets age (20-40 years) and production declines beyond 50 years. palms have highest yield at 42 and 38 years in Coast/Dar es Salaam and Tanga Regions respectively. A dyanamic programming model indicates that the optmal replacement age is 66 years. Up to this plant age , the farmer is guaranteed profit if he/she adheres to recommended palm stands husbandry practices.