<![CDATA[The purpose of the experiment is to study intercrop planting technique of soybean (var. Willis) on acidic soil among Acacia mangium Willd at HTI Mandiangin, Pekan Baru - Riau.Total area of the experiment covers 0.5 ha, divided into 5 treatment plots of 1000 m2 each. Treatments used in the experiment were: control, lime, lime + anorganic fertilizer, compost and compost + anorganic fertilizer. :Lime. was applied in the order of 2 ton/ha, compost 20 ton/ha and 60 kg urea, 45 kg TSP, 45 kg KCl for 2 period. Rhizogin was used fis biofertilizer to promote growth while Azordin 15 WSC and Dithane M 45 were used as pesticides.The resulls of the experiment for plot 1 (control) showed that the productions of biomass was 383.6 kg/ha, wet pod was 645.4kg/ha, dry pod was 466.7 kg/ha soybean was 275.7 kg/ha, average number of root nodule was 4 and plant heigt was 25.90 cm.Plot ll (acidic soil + lime): the productions of biomass was. 745.8 kg/ha, wet pod was 792 kg/ha, dry pod was 578.6 kg/ha, soybean was 436.5 kg/ha, the number of root nodule was 16 and plant height was 42.38 cm.Plot III (acidic soil +lime + anorganic fenilizer), the productions off biomass was 1331 kg/ha,.wet pod was 1067 kg/ha, dry pod was 805.8 kg/ha, soybean was 525.8kg/ha, the number of root nodule was 17 and plant height was 44.76 cm.Plot IV (acidic soil + compost) : the productions of biomass was 1113.2 kg/ha, wet pod was 1364 kg/ha, dry pod was 963.9kg/ha, soybean was 648 kg/ha, the number of root nodule was 22 and plant height was 38.55 cm.Plot V.(acidic soit+Compost+ anorganic fertilizer): the productions of biomass was 1573 kg/ha, wet pod was 2406.6 kg/ha, dry pod was 1531 kg/ha, soybean was 1060.4 kg/ha, the number of root nodule was 24 and plant height was 55.88 cm.The experiment proved that the range from the highest lo the lowest soybean production was given by compost + anorganic fertilizer(384 %),followed by compost (235%), lime + anorganic fertilizer (190 %), lime (125 %) and control (100 %). It is proved that intercrop planting promote the growth of Acacia mangium Willd i.e: compost + anorganic fertilizer (215 %), lime + anarganic fertilizer (173 %), compost (148 %), lime (163 %) and control (100 %).It is evident that compost has an important role in increasing pH or conducting more nutrients uptake, reduction of A1 toxiclty and eliminating nutrient leaching. ]]>
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