International Journal of Soil Science1816-4978xxxx-xxxxAcademic Journals Inc.10.3923/ijss.2009.93.103 LawM.C.BalasundramS.K.HusniM.H.A.AhmedO.H.Hanif HarunMohd.4200944This study aimed at quantifying the spatial variability
of SOC and estimating SOC concentration in oil palm. This study was carried
out in a commercial oil palm plantation bearing 27 year old palms. A systematic
design was employed for soil sampling at the 0-20 cm depth based on a
cluster of 4 palms that included three operational areas Weeded Circle
(WC), Frond Heap (FH) and Harvesting Path (HP). A total of 60 sampling
clusters were established. SOC was analyzed using dry combustion method.
All measurement points were geo-referenced by a differential Global Positioning
System (dGPS). The SOC data were first explored using descriptive statistics,
normality check and outlier detection. This followed by variography and
interpolation techniques to quantify the spatial variability of SOC. Results
showed that all three operational areas exhibited a definable spatial
structure and were described by either spherical or exponential models.
SOC from WC and HP showed moderate spatial dependence while that from
FH showed a strong spatial dependence. The FH had a shorter effective
range than other operational areas. Contour maps for WC, FH and HP clearly
showed spatial clustering of SOC values. All three operational areas fulfilled
the interpolation accuracy criteria. This study suggests that site-specific
management could be considered as a strategy to increase SOC sequestration
in oil palm.]]>Balasundram, S.K., M.H.A. Husni and O.H. Ahmed,2008Balasundram, S.K., P.C. Robert, D.J. Mulla and D.L. Allan,2006Elaeis guineensis Jacq.).]]>Bremner, J.M. and C.S. Mulvaney,1982Cambardella, C.A., T.B. Moorman, J.M. Novak, T.B. Parkin, D.L. Karlen, R.F. Turco and A.E. Konopka,1994Chevallier, T., M. Voltz, E. Blanchart, J.L. Chotte, V. Eschenbrenner, M. Mahieu and A. Albrecht,2000Conant, R.T. and K. Paustian,2002Conant, R.T., G.R. Smith and K. Paustian,2003Follett, R.F.,2001Follett, R.F., E.G. Pruessner, S.E. Samson-Liebig, J.M. Kimble and S.W. Waltman, 2001Gee, G.W. and J.W. Bauder,1986Goovaerts, P.,2001Henson, I.E. and S.H. Chai,1997Hutchinson, J.J., C.A. Campbell and R.L. Desjardins,2006Isaaks, E.H. and R.M. Srivastava,1989Jian-Bing, W., X. Du-Ning, Z. Xing-Yi, L. Xiu-Zhen and L. Xiao-Yu,2006Kravchenko, A.N., G.P. Robertson, S.S. Snap and A.J.M. Smucker,2006Kumar, R., S. Pandey and A. Pandey,2006Lal, R.,2005Lal, R.,2004Lal, R.,2001Lal, R. and J.M. Kimble,2001Liu, D., Z. Wang, B. Zhang, K. Song, X. Li, J. Li, F. Li and H. Duan,2006McGrath, D. and C. Zhang,2003Mohd-Basri, W.,2009Mulla, D.J. and A.B. McBratney,1999Nelson, D.W. and L.E. Sommers,1983Olsen, S.R. and L.E. Sommers,1982Rasse, D., C. Rumpel and M.F. Dignac,2005Shuit, S.H., K.T. Tan, K.T. Lee and A.H. Kamaruddin,2009Thomas, G.W.,1982Wackernagel, H.,2003Wang, H., C.A.S. Hall, J.D. Cornell and M.H.P. Hall,2002Webster, R. and M.A. Oliver,2007Wilding, L.P., L.R. Dress and L.C. Nordt,2001Zhang, C. and D. McGrath,2004