Judul: Optimization of AB Mix Fertilizer Concentration on Growth and Harvest Quantity of Erina F1 Cucumber Variety in Pot Cultivation
Abstrak: Mentimun merupakan tanaman sayur yang dikonsumsi buahnya. Tujuan penelitian ini adalah memperoleh konsentrasi pupuk optimum untuk pertumbuhan dan kuantitas mentimun varietas erina F1 pada budidaya di dalam pot. Media tanam yang digunakan adalah campuran arang sekam dan pupuk kandang dengan perbandingan 1 kg : 1 kg. Terdapat 3 taraf konsentrasi AB Mix yang diuji yaitu 2 ml L-1, 3 ml L-1, dan 4 ml L-1serta ditambah 1 taraf kontrol tanpa pemupukan. Pemberian pupuk diberikan dengan cara fertigasi sebanyak 250 ml per hari. Penelitian berlangsung dari bulan Juni hingga Agustus 2020 dan berlokasi di Kelurahan Purwokerto Lor, Kecamatan Purwokerto Timur, Kabupaten Banyumas. Pengamatan vegetatif dilakukan sebanyak 1 kali dalam seminggu hingga tanaman berumur 4 MST, sedangkan pengamatan panen berlangsung dari tanggal 1-27 Agustus 2020 dengan intensitas pengamatan sebanyak 2 hari sekali. Setelah data diperoleh kemudian dilakukan uji sidik ragam satu arah terhadap data tersebut. Hasil dari analisis uji sidik ragam membuktikan bahwa tidak ada pengaruh nyata dari perlakuan terhadap pertumbuhan dan produksi tanaman. Hal ini disebabkan oleh kurangnya pemberian air bagi tanaman yang mengakibatkan pemupukan yang tidak efektif untuk pertumbuhan tanaman. Media tanam yang memiliki daya pegang air yang rendah menyebabkan air dan nutrisi tidak tersedia cukup untuk tanaman., Cucumber is a vegetable plant that is consumed forits fruit. This study aimed to obtain the optimum fertilizer concentration for growth and harvest quantity Erina F1 cucumber varieties in pot cultivation. The planting medium used was a mixture of husk charcoal and manure with a ratio of 1 kg : 1 kg. There were 3 AB Mix concentration levels tested, namely 2 ml L -1 , 3 ml L -1 , and 4 ml L -1 , and added 1 level of control without fertilizer. Fertilizer (250 ml per day per pot) was applied by fertigation. The research took place in Purwokerto Lor Village, East Purwokerto District, Banyumas Regency, from June to August 2020. Vegetative observations were carried out once a week until four weeks after fertilizer application. While harvest observations were carried from 1-27 August 2020, the frequency of harvest observations was every two days. After the data were obtained, a one-way variance test was carried out on the data. The variance test proved that there was no significant effect of the treatment on plant growth and production. These results are caused by the lack of water supply for plants, which resulted in ineffective fertilization for plant growth. Planting media that have low water holding capacity caused insufficient water and nutrient for the plants.
Keyword: AB mix, concentration, planting media, cucumber, pots

Judul: The Effect of Paclobutazol Consentration and NPK Fertilizer Dose on The Growth and Yield of Cucumber (Cucumis sativus L.)
Abstrak: Permintaan masyarakat terhadap mentimun semakin meningkat. Salah satu usaha untuk meningkatkan produktivitas mentimun yaitu dengan menambahkan zat pengatur tumbuh berupa paclobutrazol dan pupuk NPK. Penelitian ini bertujuan mempelajari pengaruh konsentrasi paclobutrazol dan dosis pupuk NPK terhadap pertumbuhan dan hasil tanaman mentimun, serta interaksi antara kedua perlakuan. Penelitian dilaksanakan di Kecamatan Wanareja, Kabupaten Cilacap, Jawa Tengah pada Januari-April 2023. Percobaan menggunakan rancangan faktorial RKLT dua faktor dengan 3 ulangan. Konsentrasi paclobutrazol sebanyak 5 taraf, 0 mL L-1 air, 0,325 mL L -1 air, 0,375 mL L-1 air, 0,425 mL L-1 air, dan 0,475 mL L-1 air. Dosis pupuk NPK 16:16:16 sebanyak 4 taraf, 0 kg ha -1, 250 kg ha-1, 300 kg ha-1, dan 350 kg ha-1. Hasil pengamatan menunjukkan bahwa tidak terdapat interaksi antara kedua perlakuan. Pemberian paclobutrazol dapat menekan tinggi tanaman, diameter batang, jumlah helai daun, bobot buah per tanaman, dan bobot buah per petak, serta meningkatkankan jumlah bunga betina. Pemberian pupuk NPK dapat meningkatkan tinggi tanaman, diameter batang, jumlah helai daun, jumlah bunga betina, jumlah dan bobot buah per tanaman, serta jumlah dan bobot buah per petak., People's demand for cucumbers is increasing. The efforts to increase cucumber productivity is by adding growth regulators in the form of paclobutrazol and NPK fertilizer. This study aims to study the effect of paclobutrazol concentration and NPK fertilizer dose on the growth and yield of cucumber, as well as the interaction between the two treatments. The research was conducted in Wanareja, Cilacap, Central Java in January-April 2023. The experiment used a two-factor and 3-repeat RKLT factorial design. The concentration of paclobutrazol was 5 levels, 0 mL L-1 water, 0.325 mL L-1 water, 0.375 mL L-1water, 0.425 mL L-1 water , and 0.475 mL L-1 water. The dose of NPK fertilizer 16:16:16 is 4 levels, 0 kg ha -1, 250 kg ha-1, 300 kg ha-1, and 350 kg ha-1. The observations showed that there was no interaction between the two treatments. Applying paclobutrazol can suppress plant height, stem diameter, number of leaf blades, fruit weight per plant, and fruit weight per plot, as well as increase the number of female flowers. Application of NPK fertilizer can increase plant height, stem diameter, number of leaf blades, number of female flowers, number and weight of fruits per plant, and number and weight of fruits per plot.
Keyword: bunga betina, bobot buah, cucurbitaceae, tinggi tanaman

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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