Aplikasi Pemupukan Berimbang untuk Peningkatan Laju Pertumbuhan Tanaman Gaharu (Gyrinops verstegii) di Kabupaten Tabanan

ABSTRACT Application of Balanced Fertilizing for Growth Rate Increasing of Gaharu (Gyrinops verstegii) in Tabanan Regency The research that purposed to find out the combination dosage of balanced fertilizing between unorganic and organic fertilizers for growth rate increasing of gaharu was conducted at west Mundeh village west Selemadeg district and Baturiti village Kerambitan district, Tabanan regency from August 2006 until August 2007. The factorial experiment used was randomized block design consist of two factors namely organic fertilizers as the first factor with four levels: B0 (0 kg bokashi/tree); B1 (2.5 kg bokashi/tree); B2 (5.0 Kg bokashi/tree); B3 (7.5 kg bokashi/tree); and unorganic fertilizer (NPK fertilizers) as a second factors with four levels: P0 (without NPK); P1 (0.10 kg NPK/tree); P2 (0.20 kg NPK/tree), and P3 (0.30 kg NPK/tree). There are 16 treatments with 4 replications. The result showed that no interaction between organic and unorganic fertilizers treatments, but individual of each factors was influenced growth rate increasing of gaharu. Both of organic (bokashi) and unorganic fertilizers (NPK) are increasing the stem diameter and high of plants gaharu. Treatments of P3 (0.30 kg NPK/tree) and B3 (7.5 kg bokashi/tree) indicated better performance significantly for raising stem diameter than the others. Key words: Balanced fertilizing, growth rate of gaharu, organic and unorganic fertilizers.