Judul: Farmers' Preferences for the Attributes of Chilli Seeds in Temanggung Sub-district
Abstrak: Benih unggul berperan penting di era perubahan iklim seperti ini mengingat pengembangan benih unggul ditujukan untuk menghasilkan benih yang bersifat adaptif terhadap perubahan iklim, seperti toleransi terhadap suhu tinggi, kekeringan, dan serangan hama dan penyakit. Strategi adaptasi petani terhadap perubahan iklim, seperti penggunaan varietas benih unggul, telah terbukti memberikan dampak positif terhadap peningkatan produksi pertanian. Meskipun demikian penggunaan benih unggul ditentukan oleh tingkat adopsi dan preferensi petani. Mengingat cabai rawit merupakan salah satu komoditi hortikultura strategis yang terdampak perubahan iklim, maka penelitian yang bertujuan untuk menganalisis preferensi dan minat petani terhadap benih cabai rawit di Kabupaten Temanggung, Jawa Tengah ini melibatkan 317 petani responden dari lima kecamatan : Bansari, Ngadirejo, Bulu, Tlogomulyo, dan Kedu yang dipilih dengan metode purposive sampling. Analisis konjoin menunjukkan bahwa resistensi terhadap hama dan penyakit adalah atribut yang paling penting bagi petani, dengan preferensi tinggi pada benih yang sangat tahan terhadap ancaman tersebut. Selain itu, aksesibilitas untuk memperoleh benih dan harga jual cabai rawit juga menjadi pertimbangan utama. Atribut lain yangdiperhatikan meliputi umur tanaman dan potensi produksi. Temuan ini memberikan implikasi penting bagi pengembang benih dan pembuat kebijakan dalam meningkatkan kesejahteraan petani dan stabilitas ekonomi melalui pengembangan benih cabai rawit yang memenuhi preferensi petani., Improved seeds play an important role in this era of climate change because the development of improved seeds is aimed at producing seeds that are adaptive to climate change, such as tolerance to high temperatures, drought, and pest and disease attacks. Farmers' adaptation strategies to climate change, such as the use of superior seed varieties, have been proven to have a positive impact on increasing agricultural production. However, the use of superior seeds is determined by the level of adoption and farmers' preferences. Considering that cayenne pepper is one of the strategic horticultural commodities affected by climate change, the study aimed to analyze farmers' preferences and interests in cayenne pepper seeds in Temanggung Regency, Central Java, involving 317 respondent farmers from five sub-districts: Bansari, Ngadirejo, Bulu, Tlogomulyo, and Kedu which were selected by purposive sampling method. Conjoin analysis showed that resistance to pests and diseases was the most important attribute for farmers, with a high preference for seeds that are highly resistant to these threats. In addition, accessibility to seeds and the selling price of cayenne pepper were also key considerations. Other attributes considered include plant age and production potential. These findings provide important implications for seed developers and policy makers in improving farmers' welfare and economic stability through the development of cayenne seeds that meet farmers' preferences.
Keyword: Cabai Rawit, hortikultura, cayenne pepper, horticulture, atribut benih, preferensi petani, seed attributes, farmer preferences

Judul: Seed Growth Response 17 Varieties of Cayenne Pepper (Capsicum frutescens L.) in The Saline Environment.
Abstrak: Cabai rawit (Capsicum frustescens L.) adalah rempah penting Indonesia dalam menu sehari-hari dan bahan dalam industri makanan sehingga fluktuasi suplai dapat menyebabkan fluktuasi harga cabai rawit di pasar. Untuk memenuhi peningkatan permintaan, perlu dilakukan ekstensifikasi ke lahan marjinal seperti tanah salin yang makin luas. Penelitian ini bertujuan untuk mengetahui respons morfologi dari 17 varietas cabai rawit terhadap kondisi salin selama masa pembibitan. Penelitian ini dilaksanakan dari Oktober sampai Desember 2019 di Rumah Kaca Kebun Percobaan Cikabayan Bawah menggunakan rancangan acak lengkap (RAL) dengan dua faktor dan tiga ulangan. Faktor pertama yang digunakan adalah salinitas yang terdiri dari dua perlakuan, yaitu konsentrasi 0 g L-1 dan 5 g L-1, dan faktor kedua adalah varietas yang terdiri dari 17 varietas meliputi Pulaipila Putih, Pulaipila Hijau, Genie, Canon, Rinta F1, Sigantung, Kara, Bhaskara, Bonita, Sona, Tripang, Merapi, Catas, Lojana, Segana, Taruna, dan CR14. Hasil penelitian ini menunjukkan bahwa cekaman salinitas menghambat pertumbuhan vegetatif bibit yang terlihat dalam tinggi tanaman, jumlah daun, panjang dan lebar daun, bobot tanaman, dan jumlah tanaman mati. Berdasarkan analisis ragam, tidak terdapat interaksi signifikan antara perlakuan cekaman salin dengan varietas cabai rawit. Hal tersebut menunjukkan tidak adanya perbedaan respons dari varietas yang diuji dengan kondisi salinitas., Cayenne pepper (Capsicum frutescens L.) is an important Indonesian spices, that used in daily menu and as ingredient in food industry as well, therefore fluctuation in supply caused price fluctuation in the market. In order to fulfill the increase demand, extensification to marginal land such as salin soil is necessary. The research aimed to elucidate morphological response of 17 varieties of cayenne pepper to salin condition during seedling stage. This experiment was conducted from October to December 2019 at Cikabayan Bawah Research Station Greenhouse, using completely randomized design (CRD) with two factors and three replications. The first factor used in this research is salinity that consist of 2 levels, which is 0 g L-1 and 5 g L-1 concentration, and second factor is variety that consist of 17 genotype of Pulaipila Putih, Pulaipila Hijau, Genie, Canon, Rinta F1, Sigantung, Kara, Bhaskara, Bonita, Sona, Tripang, Merapi, Catas, Lojana, Segana, Taruna, and CR14. The result of this research showed that salinity stress inhibit seedling vegetative growth which could be seen in plant height, number of leaves, leaves length and width, plant weight, and number of dead plant. Based on analysis of variance, there are no significant interaction between salinity condition and varieties treatment, thats indicate that no response difference of varieties to salinity condition.
Keyword: growth inhabitation, leave characters, plant weight

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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