To enhance the effectiveness of afforestation with economic direction in combination with coastal areas protection, especially the rehabilitation of Casuarina equisetifolia, Acacia auriculifonnis's areas with poor growth and low rate of forest forming, with Acacia crassicarpa which have good ability to adapt and grow in moist sandy sites [3], application of 200 grams Song Gianh microbial organic fertilizer and 10 grams of humectants for hole (Cf2) for Acacia crassicarpa planted in cycle 2 on coastal sandy soil shows that stump diameter at CT2 is 3.14 +/- 0.19 cm, at CT2, 0.41 cm higher than the control (2.73 +/- 0.38 cm); tree height is 0.90 +/- 0.05 m, 0.15 m higher than the control (0.75 +/- 0.08 m); canopies' diameter is 1.25 +/- 0.06 m, control is 1.16 +/- 0.11 m. There is average of 4.08 +/- 0.3 trunk/tree at CT2, 0.76 higher than the control (3.32 +/- 0.9 trunk/tree). Survival rate is 83.21 percent in CT2, 9.88 percent higher than control (73.33 percent). Dry biomass is 1.392,27 kg/ha in CT2; biomass of trunks and stems has highest percentage (41.41 percent); followed by leaf biomass (31.31 percent) and root biomass is the lowest (27.28 percent). This value in the control formula is 268.60 kg/ha; highest in leaf biomass, accounted for 48.13 percent; followed by root biomass (38.31 percent) and stems biomass the lowest accounted for 13.56 percent of the total biomass. Of nodules in CT2 is 32.33 g/tree (44.84 kg/ha), 11.33 g higher/tree compared to control (21.0 g/tree). The weight of the falling of Cf2 is 196.73 kg/ha, 94.31 kg/ha higher compared to controls (102.42 kg/ha). This study's results is initially as the basis for the application of Song Gianh microbial organic fertilizer combined with moisturizer in the rehabilitation of poor growth forest areas, especially in afforestation with economic direction in combination with coastal sandy areas protection in the future.
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