Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2017.200.210AmirruddinAmiratul Diyana MuharamFarrah Melissa PaingTan Ngai SinghDaljit Singh Karam YusoffMartini Mohammad 42017164Background and Objective: Nitrogen (N) plays crucial roles in sustain ability of oil palm (Elaeis guineensis) production, environmentally and economically. Adequate nutrient supply especially N is the most important in producing high yield oil palm. However, assessing N status of tall perennial crops such as oil palm is complex and not straightforward in comparison to annual crops due to complex nitrogen partitioning and age. The objectives of this study were to examine growth and spectral responses of N fertilization on different oil palms growth stages; immature, young mature and prime mature and compare foliar N content and relative chlorophyll content as indicators of oil palm N status. Methodology: Nitrogen fertilization rates applied were varied from 0-2 kg N/palm/year according to the growth stages requirements. Growth and spectral parameters measured for this study included height, diameter, leaf area index (LAI) and spectral reflectance in visible and near infra-red (NIR) regions measured from a ground spectro radiometer and satellite images. For statistical analysis, one-way analysis of variance (ANOVA) and correlation analysis were conducted. Results: The results illustrated that growth and spectral parameters responses were age-dependent, primarily due to different allocation of nitrogen as the palms matured. Correlation analysis indicated that the spectral parameter was more sensitive to foliar nitrogen, especially ones that were acquired from satellite images and therefore have potential in predicting N nutrition status of oil palm. Conclusion: Foliar N content was found to be less influenced by the palm growth stages, while relative chlorophyll content measured using the SPAD meter should be carefully interpreted along the palm age.]]>Basiron, Y.,2007109289295Goh, K.J. and P.S. Chew,20002000pp: 3973Afandi, A.M., A.M. Tarmizi, M.H. Haniff, H. Zulkifli, A. Noh, A.B. Hamdan and H. Khairuman,2008571016Corley, R.H.V. and P.B.H. Tinker,20032003pp: 89-132pp: 89-132Goh, K.J. and R. Hardter,20032003pp: 191-230pp: 191-230Uwumarongie-Ilori, E.G., B.B. Sulaiman-Ilobu, O. Ederion, A. Imogie, B.O. Imoisi, N. Garuba and M. Ugbah,2012Elaeis guineensis) seedlings in response to inorganic and organic fertilizers.]]>22630Goh, K.J., R. Hardter and T.H. Fairhurst,20032003pp: 279-306pp: 279-306World Bank Group,20152015Goh, K.J. and S.B. Po,20052005pp: 235-268pp: 235-268Corley, R.H.V. and P.B.H. Tinker,20032003pp: 327-389pp: 327-389Nguyen, H.V., E. Lukman, J.P. Caliman and A. Flori,19951995pp: 548-554pp: 548-554Nor Azleen, A.R.,20012001Nor Azleen, A.R., B.O. Wahid, A.M Tarmizi and W. Basri,20032003Poblete-Echeverria, C., S. Fuentes, S. Ortega-Farias, J. Gonzalez-Talice and J.A. Yuri,20151528602872Rankine, I.R. and T.H. Fairhurst,1999Pages: 154Pages: 154Amirruddin, A.D., F.M. Muharam and A.R. Zaharah,201413136146West, P.W.,20153rd Edn.,Pages: 214Pages: 214Awal, M.A. and W.I. Wan Ishak,200814956Gupta, P.K.,20092nd Edn.,Pages: 366Pages: 366Azhari, A.W., K. Sopian, A. Zaharim and M. Al Ghoul,20084373378Chander, G. and B. Markham,20034126742677SAS.,2013Redshaw, M.,20032003pp: 307-319pp: 307-319Sung, C.T.B.,20162016Soon, B.B.F. and H.W. Hoong,200265364Moradi, A., C.T.B. Sung, G.K. Joo, A.H.M. Hanif and C.F. Ishak,201210417271740Moradi, A., C.B.S. Teh, K.J. Goh, M.H.A. Husni and C.F. Ishak,2014164208219Fridgen, J.L. and J.J. Varco,2004966369Castro, K.L. and G.A. Sanchez-Azofeifa,2008Populus balsamifera and Populus tremuloides leaves.]]>85169Slaton, M.R., E.R. Hunt Jr. and W.K. Smith,200188278284Carter, G.A. and L. Estep,20022002pp: 271-293pp: 271-293Schlemmer, M.R., D.D. Francis, J.F. Shanahan and J.S. Schepers,200597106112Gitelson, A.A., Y. Gritz and M.N. Merzlyak,2003160271282Li, X.L. and Y. He,2008Camellia sinensis) based on reflectance spectral characteristics.]]>4315861591Tewari, V.K., A.K. Arudra, S.P. Kumar, V. Pandey and N.S. Chandel,2013157886Stone, C., L. Chisholm and N. Coops,200149687698Ollinger, S.V.,2011189375394Chapman, G.W. and H.M. Gray,1949Elaeis guineensis Jacq.).]]>13415433Rajaratnam, J.A., K.W. Chan and M.K. Goh,19801980Hatfield, J.L., A.A. Gitelson, J.S. Schepers and C.L. Walthall,2008100S117S131Kinoca Minolta Inc.,20092009Netto, A.T., E. Campostrini, J.G. de Oliveira and R.E. Bressan-Smith,2005a fluorescence and SPAD-502 readings in coffee leaves.]]>104199209Jifon, J.L., J.P. Syvertsen and E. Whaley,2005Citrus sp. leaves.]]>130152158Loh, F.C.W., J.C. Grabosky and N.L. Bassuk,200212682686Delegido, J., L. Alonso, G. Gonzalez and J. Moreno,201012165174