Study of the effectiveness of Slow Release Fertilizer (SRF) was conducted in Dua Limpoe village, Maniang Pajo subdistrict, Wajo district during Dry Season 2008. The aim was to know the effectiveness level of SRF-N (D & H) on growth and yield of lowland rice, and to obtain the fertilizer dosage of SRF-N (D & H) that gave the highest yield of lowland rice. Twelve treatments of SRF-N (D & H) were applied, in addition to recommendation dosage factor and farmer’s way. The experiment was arranged in a Randomized Block Design with three replications. Result of assessment indicated that SRF-N (D and H) significantly affected the growth and yield of lowland rice. Application of SRF-N type H with dosage 350 kg ha-I (two times applications), combined with SP-36 and KC1, 75 kg and 50 kg ha-1 respectively gave higher dry milled grain (7.43 t DMG ha-I ) compared to other treatments of SRF, followed by SRF-H 280 kg and SRF-D 500 kg ha-I (2 times application) combined with recommendation dosage of P and K, 7.17 t and 7.15 t DMG ha-1. Treatment of farmer’s way with dosage of Urea 300 kg, SP-36 100 kg ha-1, and KCI50 kg ha-1, gave highest dry milled grain (8.14 t DMG ha-1) compared to other treatments including recommendation dosage (7.65 t DMG ha-I ). Effectiveness of SRF-N type H with dosage 350 kg (two times applications) plus 75 kg SP-36 and 50 kg KCl ha-1 on grain yield was 0.97 times compared to recommendation. There was a need to study more ofSRF-H 350 kg and 280 kg ha-1, and SRF-H 500 kg ha-I (2 times application), combined with P and K recommendation on different location and planting season to obtain accurate data in order to provide the specific location fertilizer recommendation.  Oleh: Sirappa Marthen Passang dan Razak N. (Balai Pengkajian Teknologi Pertanian Maluku; Balai Pengkajian Teknologi Pertanian Sulawesi Selatan (Indonesia)). Jurnal Budidaya Pertanian. Tahun 2013, v. 8(2) p. 76-82