Abstract - Estimating Growth (Girth), Yield and Above-ground Biomass of Hevea brasiliensis: Validation of the WaNuLCAS Model


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	Publications of MRB Latest Publications MRB Digest Journal of Rubber Research 3^rd Qtr 2008 Vol 11(3) 2^nd Qtr 2008 Vol 11(2) 1^st Qtr 2008 Vol 11(1) 4^th Qtr 2007 Vol 10(4) 3^rd Qtr 2007 Vol 10(3) 2^nd Qtr 2007 Vol 10(2) 1^st Qtr 2007 Vol 10(1) 1^st Qtr 2006 Vol 9(1) 2^nd Qtr 2006 Vol 9(2) 3^rd Qtr 2006 Vol 9(3) 4^th Qtr 2006 Vol 9(4) Submit paper/article Order Form	Abstract Estimating Growth (Girth), Yield and Above-ground Biomass of Hevea brasiliensis: Validation of the WaNuLCAS Model Yahya Abd Karim An effort was made to validate the WaNuLCAS (Water, Nutrients, and Light Capture in Agroforestry Systems) model in order to test its efficiency to predict growth (girth), yield, above-ground biomass as well as leaves and twigs biomass of Hevea brasiliensis. The model was run for 20 years, representing the economic life span of rubber. The output of the simulation was compared with the observed data for validation purposes. Results from the statistical analysis showed that the model was able to simulate girth, rubber production, above-ground biomass and leaves and twigs biomass with efficiencies (EF) of 0.83, 0.97, 0.70 and -0.15 respectively. EF measures the accuracy of the model in performing simulation as compared to experimental data. The optimum value of EF is 1. The negative value for leaves and twigs biomass indicated that the observed mean value was better than the predicted value. back
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