<![CDATA[ABSTRACTUltisol is a weathered tropical soil order with low fertility status. It is also prone to nutrient leaching processes. Plantation area of PT. Great Giant Pineapple (PT GGP), which is dominated by Ultisol, has been intensively cultivated for pineapple in rotation with banana and cassava for decades.  This study aims to evaluate the effects of FABA+compost amelioration on nutrient leaching from Ultisol of PT GGP area and its fertilizer management implications. A nutrient leaching simulation through percolation experimentation had been conducted using soil samples of 0-20 cm layer taken from the pineapple-cultivated field plots 9 months after the treatment application or one month before the plant regenerative-phase forcing step was done. Percolations were done every 7 days with 170 mL aquadest 0,75 kg-1 soil for 35 days experimental period, which was equivalent to the monthly-average of the six wet-months’ rainfall in the study area. The amelioration evaluated reduced significantly the soil nutrients leached in terms of tmax, total flux, and flux proportion. The band-application of 25 ton.ha-1 FABA+compost gave the best results. The NO3 and K leaching flux proportions, however, were still high. It is suggested to consider the use of controlled release fertilizers to reduce the nutrient leaching flux.Keywords: fertilizer management, flux proportion, percolation, total flux, tmax]]>
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