Judul: Pengaruh Dosis Pupuk Kandang dan Arang Sekam Terhadap Pertumbuhan Tanaman Garut (Maranta arundinacea L.) Di Bawah Naungan Tegakan Sengon [Paraserianthes falcataria (L.) Nielsen]
Abstrak: Garut (Maranta arundinacea L.) was proposed by government as one of food comodities which take priority to be developed and cultivated because it potential as a wheat flour substitute, which is containing alternative sources of carbohydrate. Garut not only used for food, but also for industrial raw materials. Therefor, research about growth of garut plant with different manure doses under shade of P. falcataria stands has been done with the measured parameters are high stems, plant height, diameter, and number of leaves of garut. The design of this experiment using Completely Random Design (CRD) with two factorials. Doses of manure used are 0 gram, 200 gram, 400 gram and 600 gram, and also with the addition of charcoal husk with a 1:1 ratio with the soil. From the results indicate that interaction between manure doses and charcoal husk didn’t give real effect for high stem, diameter, and number of leaves of garut plant, and only gives real impact for plant height. On the parameter number of leaves, although the interaction between manure doses and charcoal husk doesn’t give real effect, but manure doses gives real effect for the number of leaves. Duncan test result showed that 600 gram dose of manure gave a significantly different effect for the number of garut leaves.
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Judul: Pengaruh lama penaungan dan dosis pupuk nitrogen terhadap pertumbuhan dan produksi rimpang garut (Maranta arundinaceae L.)
Abstrak: Percobaan ini dilakukan untuk mengetahui pengaruh lama penaungan dan beberapa taraf dosis pupuk nitrogen (urea) terhadap pertumbuhan dan produksi rimpang garut. Percobaan dilaksanakan di kebun percobaan IPB Sindang Barang, laboratorium terpadu PSPT, dan laboratorium BALITBIO dari bulan Maret sampai November 2000. Bahan tanaman yang digunakan berupa bibit garut yang berasal dari rimpang yang telah disemaikan selama 45 hari. Paranet digunakan untuk membuat naungan dengan intensitas cahaya matahari masuk 45 %. Pupuk urea digunakan sesuai perlakuan dan diaplikasikan 2 kali, yaitu saat tanam dan pada saat tanaman berumur 12 MST. Percobaan ini menggunakan rancangan perlakuan petak terbagi dalam rancangan lingkungan acak kelompok. Perlakuan petak utama adalah lama penaungan dengan 3 lama penaungan, yaitu penaungan sampai tanaman berumur 16 MST, 24 MST, dan 32 MST. Dosis pupuk urea merupakan perlakuan anak petak dengan 3 taraf dosis, yaitu: 100 kg, 200 kg, dan 300 kg per ha. Tiap kombinasi perlakuan diulang 3 kali. Peubah persentase bibit yang hidup diamati pada umur 1 MST. Peubah yang diamati mulai umur 2 MST sampai 31 MST meliputi peubah tinggi tanaman dan jumlah anakan/rumpun. Peubah ILD, panjang dan diameter rimpang, bobot basah dan kering rimpang, bobot basah dan kering tajuk/rumpun, bobot basah dan kering akar/rumpun diamati setiap kali panen yaitu pada umur 16 MST, 24 MST, dan 32 MST. Intensitas cahaya di dalam dan di luar naungan diukur pada minggu ke 10, 20 dan 30 setelah tanam. Kandungan klorofil daun dan pati rimpang serta tepung garut dianalisis pada panen ke tiga (umur 32 MST). Hasil percobaan menunjukkan bahwa penaungan sampai umur 32 MST nyata menghasilkan jumlah anakan, bobot basah dan kering tajuk serta akar terkecil. Penaungan yang panjang (sampai umur 32 MST) cenderung menurunkan ..dst
Keyword: rimpang garut, pemupukan, dosis pupuk, ekologi, nitrogen

Judul: Kekonsistenan Hamiltonian pada Gerak Gelombang Interfacial
Abstrak: The interfacial wave is an internal wave that occurs at boundary of two layers fluid. It appears because there is difference of mass density between the two layers. The objective of this thesis is to formulate the motion of internal wave with flat base and flat as well as free upper bound surface. The motion equation obtained is a Hamiltonian system. The Hamiltonian in this system is expressed by variable of wave deviation and horizontal component of potential velocity. Under assumption that interfacial wave moves only in one direction, it can be shown that the Hamiltonian depends on the solution of the wave motion equation. The coefficients of the equation depend on the physical characteristics of the two layers of fluid, i.e. thickness and mass density. The numerical results show that Hamiltonian in the system is constant. It is consistent with Hamiltonian characteristic, which does not depend on time.
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