Judul: Respon Tanaman Cabai Merah terhadap Arah Baris Tanam yang Berbeda
Abstrak: Seloka IPB is big red chili variety of a hybrid result between IPB C2 and IPB C5. This chili has harvest ageof 62 to 86 days after planting, has high productivity and is adaptedto lowland with an altitude of 100-250 masl. While Kopay chili variety is curly red chili from Payakumbuh, West Sumatra. Kopayhas harvest age of 80- 85 days after planting (in lowland) and 90-95 days after planting (in highland), has a high productivity, and has fruitslength of 30-35 cm. This research was aimed to analyze the effect of South-North (SN) and East-West (EW) row planting on radiation balance and on biomass production. The research was conducted from 23 February to 25 June 2014 in Climatological Station Class 1 BMKG Dramaga Bogor. The results showed that row planting direction significantly affected the number of leaves and total dry weight. Total global radiation above the plant canopy was 1712 MJ m-2. Interception of radiation in row direction of EW and NS amounted to 123.8 MJ m-2 and 132.7 MJ m-2, respectively. Radiation use efficiency (RUE) in row direction of NSwas between1.23 g/MJ (minimum) and 1.41 g/MJ (maximum); while in row direction of EWwas between 1.02 g / MJ (minimum) and 1.27 g/MJ (maximum). The row direction of NS was able to intercept radiation 7% larger than that of EW. In addition, the row direction of NSalso produced 24% more plant total biomass than the row direction of EW. It is concluded that planting inNSrow direction could utilize solar radiation more efficientlyand produce more biomass.
Keyword: Bogor Agricultural University (IPB), total biomass, RUE, radiation use efficiency, radiation balance, kopay, Seloka IPB

Judul: Yield Performance Test of Second Generation Chili Pepper Mutants Induced by Gama Ray Irradiation
Abstrak: Cabai merupakan salah satu produk hortikultura yang memiliki potensi besar dan sangat penting dalam menunjang kehidupan sehari-hari karena memiliki banyak manfaat misalnya sebagai olahan sambal dan juga dapat dikonsumsi langsung. Penelitian ini bertujuan untuk menguji daya hasil dan keragaman genetik populasi M2 cabai rawit (Capsicum annuum L.) hasil induksi mutasi sinar gamma berdasarkan pengamatan fenotip. Penelitian dilaksanakan di Kebun Percobaan Pasir Kuda IPB, Bogor, pada bulan September 2023 hingga Februari 2024, menggunakan Rancangan Kelompok Lengkap Teracak faktor tunggal. Sebanyak 14 genotipe cabai rawit M2 dan 2 varietas pembanding (Pelita dan Bara) diuji dengan tiga ulangan, sehingga terdapat 48 satuan percobaan. Hasil penelitian menunjukkan bahwa terdapat perbedaan yang nyata pada karakter tinggi tanaman, bobot per buah, dan jumlah biji per buah. Tinggi tanaman berkisar antara 44,26 cm (Bara) hingga 66,39 cm (HTCrh-2). Bobot per buah tertinggi dicapai oleh varietas Pelita, sedangkan bobot terendah ditemukan pada HTCrh-1. Jumlah biji per buah berkisar antara 35,16 (HTCrh-5) hingga 61,7 (Pelita)., Chili is one of the horticultural products with great potential and significant importance in daily life due to its many benefits, such as being used in chili sauce preparation and being consumed directly. This study aims to evaluate the yield and genetic diversity of M2 chili pepper (Capsicum annuum L.) population induced by gamma-ray mutation based on phenotypic observations. The research was conducted at the Pasir Kuda Experimental Garden, IPB, Bogor, from September 2023 to February 2024, using a single-factor Completely Randomized Block Design. A total of 14 M2 chili pepper genotypes and 2 comparison varieties (Pelita and Bara) were tested with three replications, resulting in 48 experimental units. The results showed significant differences in plant height, fruit weight per fruit, and the number of seeds per fruit. Plant height ranged from 44.26 cm (Bara) to 66.39 cm (HTCrh-2). The highest fruit weight per fruit was achieved by the Pelita variety, while the lowest fruit weight was found in HTCrh-1. The number of seeds per fruit ranged from 35.16 (HTCrh-5) to 61.7 (Pelita).
Keyword: potential variety, agricultural productivity, corelation

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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