Simulating sunlight transmission on coconut computer models to predict productivity of coconut-based farming systems
1997
Eroy, M.N. | Dauzat, J. (Philippine Coconut Authority, Bago Oshiro, Davao City (Philippines). Davao Research Center)
In a coconut-based farming systems (CBFS), transmitted radiation especially the photosynthetically-active radiation (PAR) regime is very important for it had bearing on the behaviour and productivity of intercrops. At PCA-DRC, the response of corn and mungbean under coconut to transmitted light was studied and yield was found to be nearly a linear function of the PAR received. To further assess the quantity and distribution of transmitted PAR under different coconut ages and densities and predict the intercrop yields, simulations on computerized coconut mock-ups were done. The work involved (a) measurement and modelling of the coconut architecture of 5, 20, and 40 year old tall coconuts; (b) generation of virtual coconut stands with different planting patterns and densities; (c) in situ radiative measurements on observed stands and simulating light transmission on these stands using specific radiative models with respect to radiative condition, geographical location and time of year. Results of radiative simulations were quite close to the measured ones, yield prediction was then done using the results of intercropping trials and the simulated transmission values
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