Judul: Evaluasi Lahan untuk Cabai Merah Besar (Capsicum annuum L.) di Kebun Pendidikan Cikabayan IPB Dramaga
Abstrak: Pengoptimalan potensi produksi cabai merah besar di Kebun Pendidikan Cikabayan IPB Dramaga perlu mempertimbangkan kelas kesesuaian lahan. Budidaya cabai merah di daerah ini dihadapkan pada tantangan berupa curah hujan yang tinggi dan jenis tanah yang secara kimia masih memerlukan perbaikan. Penelitian bertujuan mendapatkan kelas kesesuaian lahan berdasarkan konsep FAO dengan kriteria BBSDLP serta mendapatkan data dan fakta keterkaitan antara pertumbuhan dan produktivitas cabai merah besar. Tujuan lain dari penelitian ini adalah tersedianya informasi kelayakan usahatani. Metode yang digunakan adalah evaluasi lahan sesuai konsep FAO dengan kriteria BBSDLP serta evaluasi lahan secara langsung sesuai praktik budidaya yang dilakukan oleh petani. Kesesuaian lahan aktual cabai merah adalah S3 dengan faktor pembatas berupa curah hujan yang terlalu tinggi, retensi hara (KB dan pH) yang tergolong kurang, serta ketersediaan P dan K yang rendah. Hasil evaluasi lahan secara langsung berdasarkan produksi yang dibandingkan dengan produksi optimal pada umur 4 bulan bernilai S3 dan pada asumsi umur hingga 7 bulan bernilai S2. Hasil evaluasi lahan secara langsung berdasarkan produksi yang dibandingkan dengan potensi produksi varietas pada umur 4 bulan maupun hingga 7 bulan bernilai N. Pertumbuhan cabai merah besar sesuai dengan kurva pertumbuhan sigmoid dan secara ekonomi layak diusahakan (R/C ratio > 1) baik pada umur 4 bulan maupun asumsi hingga umur 7 bulan., Optimation of red chili production potential in the Cikabayan Education Farm of IPB Dramaga needs to consider land suitability. Red chili cultivation in this area is faced with challenges of high rainfall and soil type which chemically still requires improvement. This study aims to obtain land suitability classes based on FAO concept with CALRRD criteria and to obtain data and facts on the relationship between growth and productivity of red chili. Another aims of this study is the availability of farming feasibility information. The methods used were land evaluation based on FAO concept with CALRRD criteria and direct land evaluation based on farmer’s cultivation practice. The actual land suitability of red chili is S3 with high rainfall, low nutrient retention (BS and pH), and less availability of P and K as limiting factors. The results of direct land evaluation based on production compared to optimal production at the age of 4 months was S3 and the assumed age of up to 7 months was S2. The results of direct land evaluation based on production compared to variety of production potential at the age of 4 months and up to 7 months were N. The growth of red chili corresponds to the sigmoid growth curve and economically feasible (R/C ratio>1) either at the age of 4 months or the assumed age of up to 7 months.
Keyword: growth, production, rainfall, R/C ratio, soil

Judul: Uji Daya Hasil dan Evaluasi Keragaan Sepuluh Galur Harapan Tanaman Cabai Besar (Capsicum annuum L.) IPB
Abstrak: Cabai besar (Capsicum annuum L.) merupakan salah satu komoditas hortikultura terpenting yang banyak dibudidayakan dan dikonsumsi oleh masyarakat Indonesia. Hal ini menjadikan pemuliaan tanaman cabai perlu terus dilakukan terutama dalam menghadapi tantangan perubahan iklim dan peningkatan manusia yang pesat. Penelitian ini bertujuan mengevaluasi daya hasil dan keragaan dari sepuluh galur harapan cabai besar IPB. Penelitian dilaksanakan pada September 2022 hingga Maret 2023 di Kebun Percobaan Leuwikopo IPB dan Laboratorium Pemuliaan Tanaman, IPB Dramaga, Bogor, Jawa Barat. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan tiga ulangan. Bahan tanam yang digunakan terdiri dari sepuluh galur harapan IPB dengan tiga varietas pembanding yaitu Arisa IPB, Anies IPB, dan Seloka IPB. Hasil penelitian menunjukkan bahwa perlakuan genotipe berpengaruh nyata terhadap seluruh karakter yang diamati kecuali diameter batang. Galur cabai besar yang diuji memiliki potensi untuk dilepas menjadi varietas unggul baru karena menunjukkan hasil yang sama atau lebih baik dari varietas pembanding. Dari kesepuluh galur yang diuji, galur F4.317375-3-1 berpotensi untuk menjadi calon varietas unggul baru karena memiliki jumlah buah total per tanaman yang banyak (70,46 buah), bobot buah total per tanaman yang tinggi (483,71 g), umur berbunga (30 HST) dan umur panen (75 HST) yang cepat, produktivitas tanaman tinggi (9,5 ton ha-1), potensi hasil tinggi (16,32 ton ha-1) yang setara atau lebih baik dari varietas pembanding., Chili pepper (Capsicum annuum L.) is one of the most important horticultural commodities cultivated and consumed by the Indonesian people. This makes the breeding of chili pepper plants an ongoing necessity, especially in the face of the challenges posed by climate change and rapid population growth. This research aims to evaluate the yield and performance of teen lines chili pepper IPB. The research was carried out from September 2022 to March 2023 at the Leuwikopo Experimental Garden of IPB and Plant Breeding Laboratory, IPB Dramaga, Bogor, West Java. This study used a Randomized Complete Block Design (RCBD) with a single factor and three replications. The plant material consisted of teen lines IPB and three comparison varieties of chili were Arisa IPB, Anies IPB, and Seloka IPB. The results of the study showed that the genotype treatment had a significant effect on all observed traits except stem diameter. The tested chili pepper lines demonstrated potential for release as new superior varieties, as they exhibited similar or better performance compared to the reference varieties. Among the teen tested lines, F4.317375-3-1 showed potential as a candidate for a new superior variety due to its high total fruit yield per plant (70.46 fruits), total fruit weight per plant (483.71 g), early flowering (30 DAS), early harvest (75 DAS), high plant productivity (9.5 tons/ha), and high yield potential (16.32 tons/ha), which were either equivalent or better than the reference varieties
Keyword: cabai besar, evaluasi, galur, karakter, varietas pembanding

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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