Judul: Response of Peanut Yield (Arachis hypogaea L.) Pelanduk Variety on Treatment of Type and Time Pruning
Abstrak: Kacang tanah (Arachis hypogaea L.) merupakan tanaman legum yang banyak dibudidayakan di Indonesia dan memiliki peran strategis pangan Nasional sebagai sumber protein dan minyak nabati. Peningkatan produktivitas kacang tanah banyak dilakukan dengan berbagai teknik budidaya yang relevan, yang ditujukan untuk meningkatkan produksi hasil panen. Penelitian ini bertujuan melihat respon dan pengaruh dari beberapa jenis pangkas dan waktu pangkas dalam meningkatkan produksi hasil kacang tanah. Penelitian dilaksanakan di KP Leuwikopo IPB Dramaga, Bogor pada bulan November 2020 sampai Februari 2021. Percobaan menggunakan rancangan petak terbagi (split-plot) dengan perlakuan terdiri dari dua faktor, yaitu jenis pangkas sebagai petak utama dan waktu pangkas sebagai anak petak. Hasil penelitian menunjukan bahwa perlakuan jenis pangkas dapat menurunkan rata-rata jumlah bunga yang tumbuh pada fase generatif tanaman. Waktu pangkas dapat meningkatkan daya hasil pada produktivitas tanaman, bobot polong kering per petak dan bobot 100 biji. Hal tersebut ditujukan dengan peningkatan produktivitas sebesar 2,12 ton ha-1 polong kering, 509,51 g bobot polong kering per petak dan 51,03 g 100 biji. Pemangkasan batang utama pada waktu 8 MST rata-rata dapat meningkatkan produksi hasil tanaman dimana efektivitas hasil fotosintat yang diterima oleh tanaman dapat berfokus dalam pengisian polong dan biji tanaman sehingga komponen hasil tanaman dapat meningkat secara signifikan., Peanut (Arachis hypogaea L.) is a legume that is widely cultivated in Indonesia and has a strategic role in national food as a source of protein and vegetable oil. Increasing the productivity of peanuts is mostly done by various relevant cultivation techniques, which are aimed at increasing crop yields. This study aims to examine the response and influence of several types of pruning and pruning time in increasing peanut yields. The study was carried out at KP Leuwikopo IPB Dramaga, Bogor from November 2020 to February 2021. The experiment used a split-plot design with a treatment consisting of two factors, namely the type of pruning as the main plot and the time of pruning as a subplot. The results showed that the type of pruning treatment can reduce the average number of flowers that grow in the generative phase of the plant. Pruning time can increase yield on plant productivity, dry pod weight per plot and weight of 100 seeds. This was indicated by an increase in productivity of 2.12 tons ha-1 dry pods, 509.51 g dry pod weight per plot and 51.03 g 100 seeds. Pruning the main stem at 8 WAP on average can increase crop yields where the effectiveness of photosynthate yields received by plants can focus on filling the pods and seeds of plants so that the yield component of the plant can increase significantly.
Keyword: Arachis hypogaea, Batang utama, Pemangkasan, Produktivitas, Respon

Judul: Effects of Fertilizer Types and Pruning on the Yield of Peanut (Arachis hypogaea L.) Pelanduk Variety
Abstrak: Kacang tanah merupakan tanaman Leguminosae yang sudah banyak dikenal dan dibudidayakan di Indonesia. Namun, produksi kacang tanah di Indonesia masih rendah dan cenderung stagnan. Hal ini disebabkan oleh tidak tersedianya lahan yang cukup luas untuk memproduksi kacang tanah serta teknik budidaya yang masih tergolong tradisional. Tujuan penelitian ini adalah untuk mempelajari pengaruh penggunaan beberapa jenis pupuk dan pemangkasan terhadap daya hasil tanaman kacang tanah varietas Pelanduk. Penelitian ini dilaksanakan di Kebun Percobaan Institut Pertanian Bogor, Desa Cikarawang, Kabupaten Bogor dari bulan Maret sampai Juni 2020. Penelitian ini menggunakan kacang tanah varietas Pelanduk dengan rancangan petak terbagi (split plot) dua faktor perlakuan. Petak utama adalah perlakuan pemberian beberapa jenis pupuk yang terdiri dari 5 taraf yaitu, tanpa pupuk, NPK Mutiara 300 kg ha-1, NPK Mutiara 300 kg ha-1 + kapur Dolomit 1 ton ha-1, pupuk kandang 1 ton ha-1 + pupuk daun 2 ml l-1, dan pupuk kandang 1 ton ha-1 + pupuk daun 2 ml l-1 + kapur Dolomit 1 ton ha-1. Pemangkasan sebagai anak petak terdiri dari 3 taraf yaitu, tanpa pangkas, pemangkasan 1 cabang lateral, dan pangkas batang utama. Perlakuan jenis pupuk memberikan pengaruh yang nyata pada hasil kacang tanah yaitu peubah bobot basah ubinan, bobot kering ubinan, dan produktivitas polong tanaman kacang tanah. Sedangkan pada perlakuan pemangkasan dan interaksi antara keduanya tidak memberikan hasil yang berpengaruh secara nyata. Hasil penelitian menunjukkan bahwa pemberian pupuk NPK Mutiara 300 kg ha-1 + kapur Dolomit 1 ton ha-1 memberikan hasil yang lebih tinggi pada peubah komponen hasil, namun tidak berbeda nyata dari pupuk NPK Mutiara 300 kg ha-1., Peanut is a Leguminoceae plant that is widely known and cultivated in indonesia. However, peanut production in Indonesia is still low and tends to be stagnant. This is caused by the unavailability of large enough land to produce peanuts and cultivation techniques that are still classified as traditional. The purpose of this research was to study the effect of using several types of fertilizers and pruning on the yield of Pelanduk peanut variety. This research was conducted at the Experimental field of the Bogor Agricultural University, Cikarawang Village, Bogor Regency from March to July 2020. This research used peanut varieties Pelanduk with split plot design of two treatment factors. The main plot is the treatment of giving several types of fertilizers consisting of 5 levels, namely, without fertilizer, NPK Mutiara 300 kg ha-1 , NPK Mutiara 300 kg ha-1 + Dolomite lime 1 ton ha-1 , manure 1 ton ha-1 + leaf fertilizer 2 ml l-1 , and manure 1 ton ha-1 + leaf fertilizer 2 ml l-1 + Dolomite lime 1 ton ha-1 . Pruning as a subplot consists of 3 levels, namely, without pruning, pruning 1 lateral branch, and pruning the main stem. Treatment of the type of fertilizer had a significant effect on the yield of peanuts, namely the variables of the wet weight of the tuberose, the dry weight of the tuberose, and the productivity of peanut pods. Meanwhile, the pruning treatment and the interaction between the two did not give any significant effect. The results showed that the application
Keyword: fertilizer types, peanuts, production, productivity, pruning

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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