Judul: Respon Pertumbuhan dan Produksi Beberapa  Varietas Padi (Oryza sativa L.) pada Inokulasi  Cendawan Mikoriza Arbuskula (CMA)
Abstrak: Aplikasi cendawan mikoriza arbuskula (CMA) sebagai pupuk hayati merupakan salah satu upaya untuk meningkatkan produktivitas padi. Penelitian ini bertujuan mempelajari respon inokulasi CMA pada varietas padi IPB 3S, Ciherang, Jatiluhur dan IPB 9G. Penelitian menggunakan rancangan acak lengkap (RAL) dengan dua faktor, yaitu inokulasi CMA dan 4 varietas tanaman padi. Benih yang telah diinokulasi disemai dan dipelihara selama 14 hari, kemudian dipindahkan ke dalam pot dan dipelihara di rumah kaca selama 19 minggu setelah semai (MSS). Pengamatan parameter vegetatif dilakukan pada umur yang berbeda. Tinggi tanaman dilakukan pada umur 9, 14 dan 19 MSS, jumlah daun pada umur 9, dan 14 MSS, jumlah anakan pada umur 14, dan 19 MSS, jumlah malai pada umur 19 MSS. Pada umur 19 MSS dilakukan pengataman vegetatif berupa tinggi tanaman, jumlah anakan, jumlah malai, kolonisasi CMA, dan parameter generatif seperti volume dan bobot kering akar, bobot kering batang, bobot kering daun, bobot kering malai, jumlah gabah, persentase gabah isi, dan indeks panen. Hasil pengamatan menunjukkan perlakuan CMA pada tanaman padi meningkatkan pertumbuhan vegetatif seperti tinggi tanaman, jumlah anakan umur 14 MSS, jumlah daun dan jumlah malai. CMA mampu meningkatkan produksi tanaman padi pada karakter bobot kering malai, jumlah gabah isi, total jumlah gabah, persentase gabah isi, dan indeks panen. Varietas padi baik yang diinokulasi CMA maupun tidak, meningkatkan pertumbuhan tinggi tanaman, jumlah anakan umur 14 MSS, jumlah daun, bobot malai, bobot batang, bobot daun, jumlah, gabah isi, dan total jumlah gabah. Setiap varietas padi memiliki respon yang sama terhadap inokulasi CMA, Application of arbuscular mycorrhizal fungi (AMF) as a biofertilizer is one of the efforts to enhance rice productivity. This study aimed to investigate the response of AMF inoculation on the rice varieties namely IPB 3S, Ciherang, Jatiluhur, and IPB 9G. The research employed a completely randomized design (CRD) with two factors, vis AMF inoculation and four varieties of rice plants. Inoculated seeds were germinated and maintained for 14 days, then transferred to pots and grown in a greenhouse for 19 weeks after sowing (WAS). Observations of vegetative parameters were conducted at different stages. Plant height was measured at 9, 14, and 19 WAS, number of leaves at 9 and 14 WAS, number of tillers at 14 and 19 WAS, and number of panicle at 19 WAS. At 19 WAS, vegetative measurements such as plant height,number of tillers, number of panicle, root colonization by AMF and rice, as well as generative parameters including root volume and dry weight, stem dry weight, leaf dry weight, panicle dry weight, number of grains, percentage of filled grains, and harvest index were recorded. The results showed that AMF treatment in rice plants enhanced vegetative growth, such as plant height, number of tillers at 14 WAS, number of leaves, and number of panicle at 19 WAS. AMF also increased rice plant production in terms of panicle dry weight, number of filled grains, total grain number, percentage of filled grains, and harvest index. Both AMF-inoculated and non-inoculated rice varieties exhibited similar responses in terms of plant height, number of tillers at 14 WAS,number of leaves, panicle weight, stem weight, leaf weight, number
Keyword: AMF treatment, filled grain, harvest index, number of panicles

Judul: Multicanopy Cultivation of Four Rice Varieties with Jajar Legowo Planting Distances at KP Babakan Dramaga
Abstrak: Padi (Oryza sativa) merupakan salah satu tanaman pangan terpenting di Indonesia. Peningkatan konsumsi beras tidak sebanding dengan luas panen di Indonesia. Penelitian ini bertujuan mempelajari pengaruh sistem budidaya dan varietas terhadap peningkatan produksi padi di Kebun Percobaan Sawah Baru IPB, Babakan Dramaga. Penelitian ini menggunakan RKLT faktorial dengan dua faktor yaitu sistem budidaya (monokultur, multikanopi sisip 1, multikanopi sisip 2) dan varietas (INPARI 32, INPARI 33, INPARI 43, IPB 9G sebagai tanaman sisipan). Hasil penelitian menunjukkan bahwa terdapat interaksi kedua perlakuan yang berpengaruh pada tinggi tanaman saat berumur 8 MST, tinggi batang saat panen, sudut kemiringan daun bendera. Pengaruh tunggal sistem budidaya signifikan terhadap tinggi tanaman padi saat berumur 8 MST, jumlah anakan, panjang daun dan sudut kemiringan daun bendera, bobot kering tajuk dan bobot kering malai saat panen, jumlah malai per rumpun, jumlah gabah isi per malai, bobot gabah per rumpun. Pengaruh tunggal varietas signifikan terhadap tinggi tanaman, jumlah anakan, panjang daun dan sudut kemiringan daun bendera, bobot kering malai, panjang malai, jumlah gabah per malai, jumlah gabah isi per malai, bobot 1000 butir, dan bobot gabah per rumpun., Rice (Oryza sativa) is one of the most important food crops in Indonesia. The increase in rice consumption is not proportional to the harvested area in Indonesia. This study aims to study the effect of cultivation systems and varieties on increasing rice production in the Experimental Garden of Sawah Baru IPB, Babakan Dramaga. This study used a factorial RKLT with two factors, namely the cultivation system (monoculture, multi-canopy insertion 1, multi-canopy insertion 2) and varieties (INPARI 32, INPARI 33, INPARI 43, IPB 9G as insertion plant). The results showed that there was an interaction between the two treatments that affected plant height at 8 WAP, stem height at harvest, flag leaf tilt angle. The single effect of the cultivation system was significant on rice plant height at the age of 8 WAP, number of tillers, leaf length and angle of inclination of flag leaves, crown dry weight and panicle dry weight at harvest, number of panicles per clump, number of filled grain per panicle, grain weight per clump. The single varietal effect was significant on plant height, number of tillers, leaf length and angle of inclination of flag leaf, panicle dry weight, panicle length, number of grain per panicle, number of filled grain per panicle, 1000 grain weight, and grain weight per clump.
Keyword: insertion, interaction, monoculture, production, productivity

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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