Judul: Effect of Paclobutrazol and Encapsulated Nitrogen
Fertilizer on Growth and Yield of Marigold (Tagetes erecta L.)
Abstrak: RADHITA SALSABILA. Pengaruh Pemberian Paclobutrazol dan Pupuk Nitrogen Terenkapsulasi pada Pertumbuhan dan Hasil Marigold (Tagetes erecta L.). Dibimbing oleh EDI SANTOSA dan KRISANTINI. Marigold merupakan florikultura yang memiliki keragaman manfaat. Keragaman manfaat tersebut membuat permintaan terhadap marigold semakin meningkat. Karakteristik batang marigold yang tinggi dan memiliki banyak percabangan membuat marigold tidak proporsional dan rentan rebah. Oleh karena itu, permintaan terhadap marigold belum tercukupi. Penelitian ini bertujuan mengetahui efektivitas paclobutrazol dan nitrogen setelah enkapsulasi dengan natrium alginate terhadap pertumbuhan dan produksi bunga marigold (Tagetes erecta L.). Percobaan dilaksanakan pada bulan November 2023 hingga Januari 2024 di screen house Kebun Percobaan Leuwikopo Institut Pertanian Bogor. Penelitian ini menggunakan rancangan kelompok lengkap teracak dengan 2 percobaan, masing-masing percobaan terdapat 4 perlakuan dan 5 ulangan. Percobaan pertama yaitu enkapsulasi paclobutrazol dengan perlakuan PBZ +/- enkapsulasi dan kontrol +/- enkapsulasi. Percobaan kedua yaitu enkapsulasi pupuk nitrogen dengan perlakuan N +/- enkapsulasi dan kontrol +/- enkapsulasi. Enkapsulasi paclobutrazol nyata membuat tinggi tanaman 2 MST paling rendah dari perlakuan lain, memperpendek panjang ruas 3 MST, memperbesar diameter batang, meningkatan jumlah cabang, meningkatkan bobot bunga, panjang tangkai bunga, panjang akar, dan bobot akar. Enkapsulasi pupuk nitrogen nyata meningkatkan bobot bunga, diameter bunga mekar, dan bobot kering akar. Enkapsulasi pupuk nitrogen tidak berpengaruh terhadap fase vegetatif dan generatif marigold. Kata kunci: komponen hasil, urea, vegetatif, zat pengatur tumbuh, RADHITA SALSABILA. Effect of Paclobutrazol and Encapsulated Nitrogen Fertilizer on Growth and Yield of Marigold (Tagetes erecta L.). Supervised by EDI SANTOSA dan KRISANTINI. Marigold is a floriculture that has a variety of benefits. This diversity of benefits makes the demand for marigolds increase. The characteristics of marigold stems which are tall and have many branches make marigold disproportionate and prone to falling over. Therefore, the demand for marigolds is not yet sufficient. This research aimed to determine the effectiveness of paclobutrazol and nitrogen after encapsulation with sodium alginate on the growth and production of mariold flowers (Tagetes erecta L.). The experiment was carried out from November 2023 to January 2024 at the screen house of the Leuwikopo Experimental Farm, Bogor Agricultural University. This study used a completely randomized design with 2 experiments, each experiment containing 4 treatments and 5 replications. The first experiment was paclobutrazol encapsulation with paclobutrazol treatment +/- encapsulation and control +/- encapsulation. The second experiment was N encapsulation with treatment N +/- encapsulation and control +/- encapsulation. Paclobutrazol encapsulation actually made the plant heigh at 2 WAT the lowest compared to other treatments, shortens internode length at 3 WAT, increases stem diameter, increases number of branches, increases flower weight, flower stalk length, root length and root weight. N encapsulation significantly increased flower weight, bloom diameter, and root dry weight. N encapsulation had no effect on the duration of vegetative and generative phases of marigold. Keyword: growth regulator, urea, vegetative, yield components
Keyword: urea, komponen hasil, vegetatif, zat pengatur tumbuh, growth regulator, vegetative, yield components

Judul: Growth and Flowering Response of Two Clones of Marigold (Tagetes erecta L.) to Frequency of Pinching and Fertilization
Abstrak: Marigold (Tagetes erecta L.) merupakan tanaman herba hias yang berasal dari famili Asteraceae. Bunga marigold memiliki bentuk yang unik serta warna yang indah sehingga biasa digunakan sebagai tanaman hias dalam pot maupun sebagai karangan bunga. Marigold memiliki potensi untuk dikembangkan karena memiliki nilai ekonomis yang tinggi dan bunganya memiliki banyak kegunaan. Salah satu tindakan budidaya yang dapat meningkatkan pertumbuhan dan kualitas bunga adalah dengan perlakuan pinching dan pemupukan. Penelitian dilaksanakan pada bulan Desember 2022 - Juni 2023 di Kebun Percobaan CV. Benih Dramaga, Kecamatan Dramaga, Kabupaten Bogor. Penelitian ini menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktorial dengan taraf dua faktor yaitu frekuensi pinching dan frekuensi pemupukan AB mix. Faktor pertama adalah frekuensi pinching dari tiga taraf yaitu: 1 hari sekali (A1), 2 hari sekali (A2), dan 3 hari sekali (A3). Faktor kedua adalah frekuensi pemupukan dari dua taraf yaitu 2x/minggu (B1) dan 3x/minggu (B2). Pupuk yang digunakan pada penelitian ini adalah pupuk AB mix. Varietas marigold yang digunakan yaitu Sudamala Emas 1 sebagai tanaman utama dan Maharani sebagai tanaman pembanding. Hasil penelitian dari pengaruh frekuensi pinching, frekuensi pemupukan serta interaksi pinching dan pemupukan menunjukan pengaruh yang tidak berbeda nyata terhadap tinggi tanaman, jumlah bunga per tanaman, bobot bunga per tanaman, bobot bunga per kuntum, diameter bunga, dan Umur 50% berbunga., Marigold (Tagetes erecta L.) is an ornamental herbaceous plant from the Asteraceae family. Marigold flowers have a unique shape and beautiful colors so they are usually used as ornamental plants in pots or as flower bouquets. Marigolds have the potential to be developed because they have high economic value and the flowers have many uses. One of the cultivation measures that can improve the growth and quality of flowers is pinching and fertilizing. The research was carried out in December 2022 - June 2023 at the CV. Benih Dramaga, Perumahan IPB Alam Sinarsari Dramaga, Kecamatan Dramaga, and Kabupaten Bogor. This research used a factorial Randomized Complete Block Design (RCBD) with two factor levels, namely pinching frequency and AB mix fertilization frequency. The first factor was the frequency of pinching from three levels, namely: once a day (A1), once every 2 days (A2), and once every 3 days (A3). The second factor was the frequency of fertilization at two levels, namely 2x/week (B1) and 3x/week (B2). The fertilizer used in this research was AB mix fertilizer. The marigold variety used was Sudamala Emas 1 as the main variety and Maharani as the comparison. The results of the study of the effect of pinching frequency, fertilization frequency and the interaction of pinching and fertilization showed an effect that was not significantly different from plant height, number of flowers per plant, flower weight per plant, flower weight per flower, flower diameter, and 50% flowering time.
Keyword: marigold, pinching, pemupukan

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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