Judul: Turmeric (Curcuma Domestica Val.) Plants Under Agroforestry Stands Jabon (Anthocephalus Cadamba Miq.)
Abstrak: Planting of jabon (A. cadamba) tree species have attracted many people in recent times due to its fast growing ability, cylindrical trunk with a good level of alignment, and the ability of natural pruning. Jabon tree branches arevalso high allowing light in from the side, to enhance natural regeneration. To optimize jabon forests, land can be developed through agroforestry systems. Agroforestry provides income daily, weekly, monthly and even yearly longer period for farmers. Therefore, it is necessary for the development of agroforestry jabon plant types that are resistant to shade. Turmeric (C. domestica) may be an option for agroforestry crop jabon as turmeric can be grown in shade conditions. In addition, turmeric has many benefits, thus, its use is not limited to the rhizome and the leaves can also be used as a spice in cooking to add flavor. Turmeric is also used as a refreshing drink, a natural preservative, medicinal materials (anti-Alzheimer's disease, anti-tumor, anti-diabetic), fodder for livestock and also for forensic purposes (fingerprint visualization). The results of the study treatments extract of leaves and twigs jabon shows extracts of leaves and twigs application Jabon not inhibit the growth of turmeric plants. The applications extraction of leaves and twigs of jabon showed no allelopathic effect, wherein the extract of leaves and twigs treatment of white Jabon did not inhibit the growth of turmeric plants, decrease the production of rhizomes and reduce the content of curcumin at the of age 6 BST. Agroforestry research conducted at the 3.9-year old jabon stands average shade level of 73.7% shade. The results showed that treatment J3 (Urea, SP-36, and KCl with each dose of 250 kg ha-1) was high in production from treatments J2 (Urea, SP-36, and KCl with each dose of 200 kg ha-1) and as well as treatment J1 (Urea, SP-36, and KCl with each dose of 150 kg ha-1) to the weight of the rhizome. Production of turmeric at the age of 6 months after planting (BST) ranged between 7.4 and 11.9 tons ha-1 and producing 9.9-16.4 tons ha-1 at the age of 8 BST. The content of curcumin at age 6 BST is 6% has met the standard MMI 5%.
Keyword: agroforestry, jabon, turmeric, curcumin, residues

Judul: Silvicultrual Practices and Growth of Jabon Tree (Anthocephalus cadamba Miq) in Community Forest, West Java, Indonesia
Abstrak: Jabon (Anthocephalus cadamba Miq.) merupakan jenis pohon cepat tumbuh asli Indonesia yang disukai oleh masyarakat karena adaptabilitas dan nilai ekonomi tinggi. Informasi mengenai pohon dan praktek silvikultur masih terbatas, Oleh karena itu, tujuan dari penelitian ini adalah: 1) mengumpulkan informasi mengenai praktek silvikultur yang telah dilaksanakan oleh masyarakat lokal di Jawa Barat 2) menginvestigasi performa pertumbuhan pada lokasi penanaman yang berbeda di Jawa Barat 3) menguji hubungan praktek silvikultur dengan kesuburan tanah untuk mengetahui kualitas tegakan. Aspek yang diteliti meliputi inventarisasi tegakan, pengujian contoh tanah, dan wawancara dengan masyarakat penanam jabon di wilayah Bogor, Sukabumi, Sumedang dan Purwakarta. Sebanyak 56 plot contoh dengan ukuran 0.02 atau 0.04 ha dibuat di 20 lokasi untuk melakukan pengukuran tinggi dan diameter pohon, dan serangan hama. Selain tinggi dan diameter, pada plot contoh juga diamati kerusakan pohon akibat hama. Data yang diperoleh dari lapangan, kemudian dianalisis dan disajikan dalam bentuk tabulasi dan grafik regresi. Berdasarkan dari hasil wawancara, sebagaian besar pemilik modal penanaman jabon berasal dari luar kota. Terdapat tiga tipe dari sistem menejemen yang dilakukan yaitu: kerjasama, menggaji karyawan, dan melakukan menejemen langsung yang dilakukan oleh pemilik modal. Berdasarkan informasi yang diperoleh, diketahui masih sedikit pengelola yang telah mengikuti pelatihan teknik selvikultur jabon Namun demikian semua pengelola telah menerapkan teknik dasar silvikultur seperti persiapan lahan, penanaman, pemupukan, serta pengendalian gulma, hama dan penyakit. Dari hasil inventarisasi diketahui pohon jabon di lapangan berusia antara 0,5 sampai 3.5 tahun, karena pohon jabon baru diperkenalkan sejak tahun 2008. Interval diameter rata-rata berkisar 2.45 cm sampai 14.57 cm, dengan nilai terbesar 29.3 cm dan tinggi rata-rata berkisar antara 1.29 m sampai dengan 12.62 m dengan tinggi maksimal sebesar 18.68 m di lokasi Situgede Bogor. Model Chapman digunakan untuk menghitung kurva index tempat tumbuh. Berdasarkan model regresi dari peninggi tegakan, nilai kurva index tempat tumbuh: Hd = 10. 6982(1 − exp(−0.8915t)). dengan nilai R-Square 0.6513. Nilai dari kurva ini, membagi 20 lokasi menjadi 3 katagori yaitu baik (2), sedang (12), dan buruk (6). Terdapat tiga persamaan antara umur dan diameter (DBH), yang dapat diperkirakan berdasarkan klasifikasi dari lokasi. Hasil dari perbandingan antara lokasi baik dan buruk, tampak bahwa kondisi lokasi dan kesuburan tanah lebih memberikan pengaruh yang nyata terhadap pertumbuhan jabon, dibanding dengan praktek silvikultur seperti pemupukan dan pemeliharaan.
Keyword: Anthocephalus cadamba Miq, Community Forest, Silvicultural practices, Site Index Curve

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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