Judul: Pengaruh pemangkasan dengan jumlah cabang berbeda terhadap pertumbuhan vegetatif dan generatif rosela [Hibiscus sabdariffa L.]
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh jumlah cabang terhadap pertumbuhan vegetatif dan generatif tanaman rosela. Penelitian dilaksanakan di Kebun Percobaan Cikabayan, Departemen Agronomi dan Holtikultura, Institut Pertanian Bogor, pada bulan Februari sampai Juni 2009.
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Judul: Pengaruh pemupukan terhadap vigor benih tanaman rosella (Hibiscus sabdariffa L.)
Abstrak: Tujuan penelitian ini adalah untuk mengetahui pengaruh dari pemupukan terhadap tanaman sumber benih Rosella untuk mendapatkan benih yang vigornya tinggi, sehingga dapat menunjang usaha penyediaan benih yang bermutu sehubungan dengan mulai digalakkannya pengembangan tanaman serat karung rakyat dalam Pelita III. Pengamatan clilakukan terhs.dap vigor bibit clan vigor tanaman dari benih asal yang menerima perlakuan pemupukan. Sedangkan vigor kecambah diukur dari benih hasil procluksi tanaman yang telah menerima perlakuan tersebut. Vigor bibit diukur dengan menggunakan parameter tinggi bibit pada minggu ke 3, 4, 5 dan 6. Vigor tanaman diukur pacla akhir pertumbuhan vegetatif clengan menggunakan parameter perkalian setengah tinggi tanaman clengan lebar tanaman (½ t x 1), berat basah dan kering tanaman, jumlah biji per buah, jumlah buah per tanaman, produksi benih per plot, produksi benih teoritis per plot dan berat 1000 benih. Vigor kecambah diukur dengan menggunakan parameter kecepatan tumbuh, berat kering kecambah, keseragaman tumbuh, ketahanan benih terhadap kekeringan dan penyakit. Disamping itu benih yang dihasilkan diukur daya simpannya.
Keyword: Hibiscus sabdariffa;, Fertilizers;, Seedling vigor;

Judul: Synthesis of Apatite - Chitosan Composite Using Duck Eggshell and Chitosan with Temperature and pH Control
Abstrak: Composite of apatite-chitosan was prepared by using chitosan as polymer matrix. Calcium phosphate was prepared from CaO and (NH4)2HPO4, which the ratio Ca : P had to be 1.67. Chitosan is produced by deacetilase from biopolymer chitin. Duck eggshell (95% CaCO3) as starting material was converted to be calcium oxide (CaO) through calcinations with temperature 1000oC for 5 hours. In-situ and ex-situ methods were prepared from apatite and chitosan (dissolved with acetate acid 2%). Calcium phosphate prepared for bone implantation, but it is too fragile and brittle to be implant into the body. So addition of chitosan can decrease crystalinity and increase mechanic characteristic (tougher). Composite apatite-chitosan was resulted by fast precipitation. Fast precipitation was held in a breaker glass with nitrogen atmosphere, under controlled temperature at 37oC and pH 7, in order to increase amount of hydroxyapatite. Precipitation with CaO which was dropped by (NH4)2HPO4. Hydroxyapatite and chitosan were appearing at samples with in-situ and ex-situ methods which indicating by peak matching of XRD (closed lattice parameter, crystal size), overlapping at FTIR spectra and supporting by SEM picture (homogenous and agglomerated particle). However, it still needs further research to examine biocompatibility osteoconductive degree of sample by in-vivo and in-vitro test.
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