Judul: Yield Potential Test of Tomato (Solanum lycopersicum L.) Collection of PKHT IPB at Leuwikopo
Abstrak: Pengembangan varietas tomat di dataran rendah dapat menambah luas penanaman tomat, dan mengurangi tekanan penanaman di dataran tinggi yang berpotensi merusak kelestarian lingkungan. Varietas tomat dataran rendah yang unggul dapat meningkatkan produksi sehingga kebutuhan konsumsi tomat dapat tercukupi. Uji daya hasil dibutuhkan untuk menguji daya hasil galur-galur tomat yang telah ada, kemudian diseleksi untuk dikembangkan menjad varietas. Penelitian ini bertujuan untuk mendapat daya hasil genotipe tomat koleksi PKHT IPB. Penelitian dilakukan di Kebun Percobaan Leuwikopo, IPB, Dramaga, Bogor pada bulan April hingga Agustus 2013. Metode penelitian menggunakan Rancangan Kelompok Lengkap Teracak (RKLT), satu faktor dengan tiga ulangan. Faktor tersebut adalah 11 galur potensial tomat yang terdiri atas 3 varietas komersial (Intan, Ratna, dan Karina) sebagai pembanding.Genotipe yang diuji menujukkan keragaman sangat nyata untuk karakter bobot per buah, tinggi tanaman, lebar daun, jumlah buah per tanaman, panjang buah, dan diameter buah, serta nyata untuk karakter tebal daging, panjang daun dan umur berbunga. Tidak terdapat perbedaan pada karakter diameter batang, umur panen, bobot buah pertanaman dan produktivitas. Karakter bobot perbuah genotipe IPBT8, IPBT43, IPBT57, IPBT60, IPBT64 dan IPBT78 tidak berbeda dengan varietas pembanding. Karakter jumlah buah pertanaman genotipe IPBT3, IPBT30, IPBT33, dan IPBT53 menunjukkan jumlah lebih banyak dibandingkan varietas pembanding. Genotipe tomat yang memiliki daya hasil lebih baik dari genotipe lainnya adalah genotipe IPBT8., The development of tomato varieties in the lower elevation lands is important for increasing the area of planting tomatoes, and reduce the pressure of planting in the highlands that have the potential to damage environmental sustainability. The superior low land tomato varieties can increase production so that tomato consumption needs can be fulfilled. The trial results are needed to identify the potential of the existing tomato genotype. This research aimed to obtain the information of the tomato genotype collection of PKHT-IPB. The experiment was conducted at Leuwikopo Field Station, IPB, Dramaga, Bogor from April to August 2013. The genotype was arranged in Randomized Complete Block Design (RCBD), with three replications. The tomato genotypes that used in this experiment consist of 11 potential genotypes and 3 commercial varieties (Intan, Ratna, and Karina) as control varieties. The tested genotypes showed very significantly differences for the character of fresh weight per fruit, plant height, leaf width, fruit number per plant, fruit length, and fruit diameter, and significantly differences for the character of fruit flesh thickness, leaf length, and flowering time. There were no differences on the character of stem diameter, harvesting time, fresh weight per plant and productivity.The character of fresh weight per fruit of IPBT8, IPBT43, IPBT57, IPBT60, IPBT64 and IPBT78 similar to the control varieties. The character of fruit number per plant of IPBT3, IPBT30, IPBT33, and IPBT53 show more number than the control varieties. Tomato genotypes that have a better yield ability than other genotypes were IPBT8.
Keyword: productivity, IPBT8, Lower elevation lands

Judul: Uji Daya Hasil Tomat (Solanum lycopersicum L.) Koleksi PKHT IPB di Tajur
Abstrak: Tomat merupakan komoditas hortikultura yang bernilai ekonomi serta bermanfaat bagi kesehatan tubuh manusia. Konsumsi tomat meningkat seiring dengan peningkatan kesadaran masyarakat akan pola hidup sehat. Populasi tomat di dataran tinggi mulai terbatas akibat persaingan dengan komoditas pertanian lainnya. Oleh karena itu, diperlukan perluasan populasi tomat kedataran rendah. Namun, memiliki kendala yaitu kesesuaian iklim, produktivitas, kualitas buah, ketahanan terhadap hama dan penyakit, sehingga pemuliaan tanaman tomat adaptif dataran rendah perlu dilakukan. Penelitian ini bertujuan untuk menguji daya hasil genotipe tomat (Solanum lycopersicum L.) koleksi PKHT IPB di dataran rendah. Percobaan dilaksanakan di kebun percobaan Tajur PKHT IPB, pada bulan Januari hingga April tahun 2013. Percobaan menggunakan rancangan kelompok lengkap teracak, satu faktor dan tiga ulangan. Faktor tersebut adalah genotipe tomat yang terdiri dari genotipe IPBT3, IPBT8, IPBT30, IPBT33, IPBT34, IPBT43, IPBT53, IPBT57, IPBT60, IPBT64, IPBT78 serta tiga varietas komersil (Intan, Karina dan Ratna) sebagai pembanding. Hasil penelitian menunjukan bahwa genotipe berpengaruh nyata terhadap keseluruhan karakter uji kecuali diameter batang. Genotipe tomat yang memiliki daya hasil lebih baik dari varietas pembanding Intan dan Karina adalah IPBT57 dan IPBT64. Karakter panjang daun, umur berbunga dan bobot buah pertanaman berkorelasi positif terhadap produktivitas tanaman. Genotipe tomat yang diuji beradaptasi cukup baik dilokasi uji coba., Tomato is a horticultural commodity that has economic value and is beneficial for the health of the human body. Consumption of tomato is increasing along with increasing public awareness of healthy lifestyle. Tomato population in the highland is starting to be limited due to competition with other agricultural commodities. Therefore, expending the lowland tomato is a necessity. However, it has constraints that are climate suitability, productivity, fruit quality, resistance to pests and diseases, so that the breeding of lowland adaptive tomato plants needs to be done. The research aimed to obtain the yield information of tomato genotype collection of PKHT-IPB. The experiment was conducted at Tajur, Bogor from January till April 2013. The experiment used a randomized complete block design, single factor and three replications. The factor was genotype that consisted of IPBT3, IPBT30, IPBT33, IPBT34, IPBT43, IPBT53, IPBT57, IPBT60, IPBT64, IPBT78 genotypes, and three comercial varieties (Intan, Karina and Ratna) as controls. The results showed that the genotypes significantly affected the overall character except for the stem diameter character. Tomato genotypes that had a better yield ability than commercial varieties Intan dan Karina were IPBT57 and IPBT64. Character of leaf length, flowering age and fruit weight were positively correlated with plant productivity. The tomato genotypes tested adapted quite well in the trial locations.
Keyword: dataran rendah, genotipe, produktivitas

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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