In the perspective of sustainability, agroforestry is the last resort of natural resource management which synergizes productivity escalation that meets sustainable principles. However, agroforestry management in Indonesia is still trivial and traditional. This research was done to develop compatible agroforestry development schemes as pro poor technology to support prospective and sustainable management
Tujuan penelitian ini adalah mempelajari pengaruh persentase katalis cangkang tiram untuk memproduksi biodiesel dari minyak jelantah yang dihasilkan melalui reaksi transesterifikasi yang dibantu dengan mengaktifkan katalis cangkang tiram. mengaktifkan katalis. Minyak Jelantah diperoleh dari penjual kentang goreng yang berlokasi di simpang empat Asean, Aceh Utara. Reaksi pembuatan biodiesel dilakukan menggunakan seperangkat alat reaktor yang dipanaskan didalam penangas air pada suhu antara 60-65ºC dengan kecepatan pengaduk 300 rpm. Penelitian menggunakan perbedaan persentase katalis( 1%, 5%, 8%, 15%, 20% dan 25%). Reaksi transesterifikasi dilakukan dengan 100 ml minyak jelantah pada perbandingan molar minya jelantah terhadap metanol 1 : 9. Parameter yang dianalisis meliputi SEM, XRD, GC-MS, viskositas dan massa Jenis. Hasil penelitian menunjukkan, viskositas, dan massa jenis biodiesel. Biodiesel yang dihasilkan memiliki massa jenis 0,88–0,92 g/mL, dan bilangan asam 0.6877- 0.9452 mg-KOH/kg . Persentase katalis berpengaruh nyata pada produksi biodiesel
Penelitian ini bertujuan untuk melihat pengaruh tekanan pencetakan terhadap karakteristik briket dengan variasi lubang Perlakuan Jumlah lubang: 0, 1, 2, dan 3 lubang dan waktu Pengepresan: 30, 45, 60, dan 75 detik. Dari perlakuan tersebut diketahui bahwa waktu optimum untuk pengepresan briket adalah 5 menit.hal ini terjadi apabila semakin lama waktu pengerpresan maka briket akan hancur dan tidak terbentuk. Nilai kalor tertinggi didapatkan pada perbandingan tekanan sebesar 30 detik dengan bahan baku tempurung kelapa dengan penggunaan perekat kanji sebanyak 8%. Nilai kalor yang didapatkan sebesar 6858 kal/gr. Jadi nilai kalor yang didapat telah memenuhi standar minimum nilai kalor yang ditentukan SNI.
Shorea platyclados is one of fast growing Dipterocarp species for enrichment planting in Logged Over Area (LOA) of tropical rain forests. One of the constrain to supply the seedling for support enrichment planting is the irregular flowering of S. platyclados. Moreover, the vegetative propagation is an alternative method to provide the sustainable seedling for enrichment planting in the LOA. This experiment was carried out to assess the effects of IBA concentrations on rooting ability, the primary and secondary root length, and the accumulated number of primary and secondary roots on shoot cutting of S. platyclados. The research was conducted in Completly Randomized Design (CRD) with 5 replications. The treatment was five concentrations of IBA, i.e. 0 ppm, 25 ppm, 50 ppm, 75 ppm, and 100 ppm. The data were analyzed using one-way analysis of variance (one way ANOVA) to determine the effect of IBA concentration variation among the treatments. The Duncan Multiple Range Test (DMRT) was used for multiple comparisons among the means of treatment at tα=5%, Results showed IBA concentrations significantly affected the rotting ability, the primary and secondary root length of shoot cutting (P < 0.05). On the other hand, the number of primary and secondary roots was not significantly different among treatment (P > 0.05). For rooting ability, 100 ppm of IBA concentration was the highest of all treatments. Meanwhile, 75 ppm of IBA concentration was the best treatment for development of root, i.e. the number of primary roots, the length primary and secondary roots.
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