<![CDATA[The research about growth level and seed biomass of Rhizophora apiculata was conducted on September to November 2009 in Upang Delta area, Banyuasin Regency, Province of South Sumatera. The observation location was divided into 3 stations. The  growth level of Rhizophora apiculata seed was measured in each monitorings for three months after planting. Calculation and measured were done conducted consist of living percentage, seed growing, total of leaves and diameter of tree. Calculation biomass of Rhizophora apiculata seed was conducted by cutting seed then it was dried on the oven with temperature 105 oC for 24 hours. The living percentage of R. Apiculata was range between 46,67-73,33%. The increase height average of bud weas 0,45-0,74 cm. The average diameter of bud which have been planting for 3 months were 0,02-0,04 peaces. Biomass of R. apiculata feed lings 3 months were 21,622-33,729 gr. Keywords: Biomass, Growth level, Rhizophora apiculata, The Delta of Upang.  Penelitian tingkat pertumbuhan dan biomassa bibit Rhizophora apiculata dilakukan pada bulan September sampai November 2009 di Delta Upang Kabupaten Banyuasin, Propinsi Sumatera Selatan. Lokasi pengamatan dibagi menjadi 3 stasiun. Untuk mengetahui tingkat pertumbuhan bibit R. apiculata dilakukan pengukuran pada setiap kali pengamatan selama tiga bulan setelah penanaman. Perhitungan dan pengukuran yang dilakukan meliputi persentase kehidupan , pertumbuhan tunas, jumlah daun serta ukuran diameter batang. Perhitungan biomassa bibit R. apiculata dilakukan dengan memotong bibit kemudian dikeringkan ke dalam oven pada suhu 105oC selama 24 jam. Tingkat persentase hidup R. apiculata yaitu berkisar antara 46,67-73,33%. Pertambahan tinggi tunas rata-rata bibit yaitu 0,45-0,74 cm. Diameter rata-rata selama tiga bulan penanaman berkisar antara 0,02-0,04 mm dan jumlah daun rata-rata selama tiga bulan penanaman yaitu 2-3 helai. Biomassa yang didapatkan setelah tiga bulan pengamatan yaitu 21,622-33,729 gr. Kata kunci : Biomassa, Delta Upang, Rhizophora apiculata, Tingkat pertumbuhan]]>
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