Judul: Pengaruh Inokulasi Mikoriza Arbuskular dan Pupuk Kandang Sapi terhadap Pertumbuhan Semai Kayu Putih (Melaleuca cajuputi) di Tanah Pascatambang Batu Kapur
Abstrak: Tanah pascatambang kapur memiliki kesuburan yang rendah sehingga proses revegetasi akan terhambat. Penambahan amelioran tanah dan pemilihan tanaman yang tepat diperlukan agar revegetasi berhasil dengan baik. Penggunaan Fungi Mikoriza Arbuskular (FMA) dan pupuk kandang sapi diharapkan dapat membantu pertumbuhan tanaman pada tanah pascatambang batu kapur. Tujuan penelitian ini adalah (1) menganalisis pengaruh interaksi FMA dan pupuk kandang sapi terhadap pertumbuhan tanaman kayu putih di tanah pascatambang kapur, (2) menganalisis dosis pupuk kandang yang optimal dalam meningkatkan pertumbuhan kayu putih. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan dua faktor perlakuan (mikoriza dan pupuk kandang sapi). Hasil penelitian menunjukkan bahwa tidak ada pengaruh dari interaksi antara inokulasi FMA dengan pupuk kandang sapi. Pemberian FMA secara tunggal juga tidak berpengaruh secara nyata terhadap pertumbuhan semai kayu putih. Sementara faktor tunggal pupuk kandang sapi berpengaruh nyata pada pertumbuhan semai, dosis terbaik pupuk kandang sapi yaitu 15% yang dapat meningkatkan pertumbuhan tinggi dan diameter masingmasing sebesar 28,04% dan 38,41% dibanding tanaman kontrol., Post-mining soil has low fertility so that the revegetation process will be hampered. The addition of soil ameliorants and proper plant selection are necessary for successful revegetation. The use of Arbuscular Mycorrhizal Fungi (AMF) and cow manure is expected to help plant growth on post-limestone mining soil. The aims of this study were (1) to analyze the interaction effect of AMF and cow manure on the growth of eucalyptus plants in post-lime mining soil, (2) to analyze the optimal dose of manure in increasing eucalyptus growth. This study used a completely randomized design (CRD) with two treatment factors (mycorrhizae and cow manure). The results showed that there was no effect of the interaction between AMF inoculation with cow manure. Giving AMF alone also did not significantly affect the growth of eucalyptus seedlings. While the single factor of cow manure had a significant effect on seedling growth, the best dose of cow manure was 15% which could increase growth in height and diameter by 28,04% and 38,41%, respectively, compared to control plants.
Keyword: Eucalyptus, Mycorrhiza, Cow Manure, Post-mining Lime Soil

Judul: The Effect of MycoSilvi and Soil Ameliorant on The Growth of seedling Kayu Kuku (Pericopsis mooniana) on Silica Sand Post-Mining Land
Abstrak: Kegiatan pertambangan dapat menurunkan kesuburan tanah yang dicirikan oleh kandungan bahan organik yang rendah dan pH tanah yang masam, sehingga dapat menghambat kegiatan revegetasi. Kayu kuku merupakan salah satu jenis tanaman yang banyak digunakan untuk merevegetasi lahan pascatambang. Tujuan penelitian ini adalah menganalisa respon pertumbuhan semai kayu kuku (Pericopsis mooniana) dengan perlakuan MycoSilvi dan amelioran tanah pada media pascatambang pasir silika. Rancangan percobaan yang digunakan pada penelitian ini yaitu Rancangan Acak Lengkap (RAL) dengan tiga faktor perlakuan (MycoSilvi, arang tempurung kelapa dan pupuk kandang kambing). Hasil penelitian menunjukkan kombinasi 5 g MycoSilvi, 45 g arang tempurung kelapa dan 45 g pupuk kandang kambing merupakan kombinasi terbaik yang menghasilkan total laju pertumbuhan tinggi dan kandungan klorofil paling besar dibandingkan perlakuan lainnya., Mining activities can reduce soil fertility which is characterized by low organic matter content and acidic soil pH, which can inhibit revegetation activities. Kayu Kuku is one type of plant that is widely used for revegetating post-mining land. The purpose of this study was to analyze the growth response of kayu kuku (Pericopsis mooniana) seedlings with MycoSilvi treatment and soil ameliorant on silica sand post-mining soil. The experimental design used in this study was a Completely Randomized Design (CRD) with three treatment factors (MycoSilvi, coconut shell charcoal, and goat manure). The results showed a combination of 5 g MycoSilvi, 45 g coconut shell charcoal, and 45 g goat manure was the best combination that produced a high total growth rate and the greatest chlorophyll content compared to other treatments.
Keyword: Coconut shell charcoal, Goat manure, MycoSilvi, Pericopsis mooniana, post mine

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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