Biophysical properties of various ages oil palm plantation in Ultisols of Bengkulu

Abstract Oil palm plantation (OPP) expands to soil with less suitable including Ultisol. The purposes of this study were (1) compare some selected properties among various OPP ages and (2) determine the correlation properties. A Completely Randomized Block Design single factor treatments oil age consisting 2-yr, 3 -yr, 4-yr, 8-yr, 32-yr OPP, all was repeated three times. Blocking based on floor positions: circle weeding (CW), frond stack (FS), between (BP). All data statistically analyzed using ANOVA 5% a , DMRT at 5 % used treatments. result showed that Ultisol in good management especially keeping or improving organic C through maintaining understory vegetation, may reach sustainability. Increasing followed by increasing C, water holding capacity (WHC), decreasing bulk density (BD). highest root (OPRD), dray (OPDRD), CO 2 emissions found 8-yr while value vegetation biomass weight (UVBMW) (UVBMDW) reached 4-yr OPP. Organic weakly correlated actual moisture (ASM) (r=0,485) aggregate stability (AS) (r=0,465)