Judul: Respon Produksi Tanaman Tomat Varietas Tora terhadap Perbedaan Kondisi Iklim Mikro Akibat Pemakaian Mulsa Perak dan Hitam
Abstrak: Tora is non-hybrid tomatoes that cultivated and developed by IPB. This tomato has a high potential production and suitable to be planted in the low land. This research aims to analyze the condition of the microclimate around the tomato plants and determine the treatment effect of mulch types that different in productivity. Location of the research at BMKG precisely in Situgede, Dramaga Bogor. Treatment is done is by providing silver and black mulch on tomato plants, the research was done from February to June 2014 . Result shows that tomato plants are growing more optimal in silver mulch than the black mulch treatment. Agronomic components such as plant height, leaf number, and total dry weight obtained that silver mulch treatment is optimal, but by the statistical treatment the significantly affect only in plant height and number of leaves. Interception of radiation in silver and black mulch treatment respectively amounted to 171.4 MJ m-2 and 208.6 MJ m-2 in planting season. Total of radiation use efficiency in a season was 1.7 g/MJ on silver mulch and 1.8 g/MJ on black mulch. The Comparison of the reflected radiation and the radiation that comes in silver mulch is 0.53, while the black mulch is 0.32. Total fruit weight of each plant in silver mulch is 1370 g and the black mulch is 914 g.
Keyword: Bogor Agricultural University (IPB), specific leaf area, global radiation, heat unit, leaf area index

Judul: Physiological and Production Responses of Microtome Tomatoes to High Temperature and Artificial Light with Light Emitting Diodes
Abstrak: Tomat adalah produk hortikultura semusim yang populer. Tomat merupakan komoditas sayuran buah dari keluarga Solanaceae yang banyak diproduksi dan dikonsumsi di seluruh dunia, tomat kaya akan mineral, vitamin, asam amino esensial, gula dan serat. Mikrotom (Solanum lycopersicum cv. Micro-Tom) adalah tanaman model berukuran kecil dengan siklus hidup yang pendek dan buah yang kecil. Perubahan iklim global mengakibatkan peningkatan suhu, sehingga diperlukan percobaan budidaya di kondisi suhu tinggi. Penggunaan cahaya buatan dalam teknik budidaya diketahui dapat memperpendek siklus tanaman dan mempercepat fase juvenil. Penelitian ini bertujuan untuk mempelajari respons pertumbuhan, fisiologi, dan produksi tomat Mikrotom dan beberapa varietas lainnya terhadap perlakuan suhu tinggi dan pencahayaan buatan dengan LED. Penelitian ini dilakukan di Kebun Percobaan Leuwikopo IPB Bogor, dari Maret hingga November 2023. Rancangan acak kelompok lengkap (RAKL) digunakan pada perobaan suhu tinggi dan rancangan acak lengkap (RAL) pada percobaan LED. Identifikasi full length transcript menghasilkan data raw reads dan clean reads yang merepresentasikan kualitas dan kuantitas dari RNA-sequencing, selain itu diperoleh diagram venn kelompok gen hasil dari pemetaan clean reads terhadap referensi genom tomat dan diperoleh juga data kelimpahan gen hasil dari analisis kluster menggunakan heatmap. Hasil penelitian pada percobaan suhu tinggi menunjukkan bahwa perlakuan suhu normal (NT) masih lebih unggul dibandingkan suhu tinggi (HT) dalam hal parameter pertumbuhan seperti tinggi tanaman, jumlah daun, dan jumlah bunga, parameter fisiologis seperti kandungan klorofil dan kandungan glukosa-fruktosa, serta komponen produksi seperti jumlah buah. Respons yang berbeda-beda dapat dilihat dari 4 varietas tomat yang digunakan yaitu Bareto F1, Gustavi F1, Tymoti F1 dan Mikrotom, varietas Bareto secara umum lebih unggul dibandingkan varietas lainnya. Respons tomat Mikrotom terhadap cahaya buatan menggunakan LED Ungu dan LED Putih tidak menunjukkan perbedaan signifikan dalam parameter pertumbuhan dan produksi, perbedaan signifikan diamati pada genotipe tomat yang digunakan, yaitu WildType dan iaa9-3. Pada parameter fisiologi seperti klorofil dan glukosa-fruktosa, tidak ada perbedaan signifikan dalam perlakuan LED atau genotipe tomat mikrotom. Dalam hal parameter kualitas buah, nilai PTT (brix) – TAT (acidity), glukosa-fruktosa, dan asam malat juga tidak menunjukkan perbedaan signifikan. Penggunaan kombinasi LED polikromatrik dan monokromatik dapat memberikan respons yang beragam. Analisis LC-MS/MS pada daun LED Ungu menghasilkan profil metabolit sekunder yang didominaasi dari kelompok senyawa asam lemak., Tomatoes are a popular seasonal horticultural product. As a fruit vegetable commodity from the Solanaceae family, tomatoes are widely produced and consumed worldwide, rich in minerals, vitamins, essential amino acids, sugars, and fiber. Micro-Tom (Solanum lycopersicum cv. Micro-Tom) is a small-sized model plant with a short life cycle and small fruits. Global climate change has resulted in increased temperatures, necessitating cultivation experiments under high-temperature conditions. The use of artificial light in cultivation techniques is known to shorten the plant cycle and accelerate the juvenile phase. This research aimed to study the growth, physiological, and production responses of Micro-Tom tomatoes and several other varieties to high-temperature treatment and artificial LED lighting. The study was conducted at the Leuwikopo Experimental Field of IPB Bogor from March to November 2023. A complete randomized block design (CRBD) was used for the high-temperature experiment, and a completely randomized design (CRD) was used for the LED experiment. The identification of
Keyword: LED, production, secondary metabolites, high temperatures, lights

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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