Judul: The Effect of Type and Pruning Time for Peanuts (Arachis hypogaea) Production of Zebra Varieties
Abstrak: Hasil produksi kacang tanah dapat ditingkatkan dengan cara melakukan pemangkasan pada cabang tanaman. Pemangkasan pada cabang diharapkan dapat menekan laju pertumbuhan vegetatif sehingga laju pertumbuhan generatif meningkat. Penelitian ini bertujuan mengetahui jenis pangkas dan waktu pangkas yang berpengaruh terhadap hasil produksi kacang tanah. Penelitian ini dilaksanakan di Kebun Percobaan Leuwikopo IPB pada bulan November 2020 sampai Maret 2021. Rancangan percobaan yang digunakan dalam penelitian ini adalah rancangan petak terbagi (split-plot) dengan petak utama merupakan jenis pangkas dan anak petak merupakan waktu pangkas. Jenis pangkas yang digunakan adalah tanpa pangkas, pangkas batang utama, dan pangkas cabang lateral. Waktu pangkas adalah pada saat tanaman berumur 6 MST, 8 MST, dan 10 MST. Hasil penelitian menunjukkan jenis pangkas berpengaruh nyata terhadap jumlah cabang lateral pada 8 MST, 10 MST, dan 12 MST. Jenis pangkas juga berpengaruh nyata terhadap bobot 100 biji. Waktu pangkas tidak memberikan pengaruh yang nyata terhadap peubah pengamatan yang diamati. Interaksi antar kedua perlakuan berpengaruh nyata terhadap bobot 100 biji., Peanuts production can be increased by pruning plant branches. Pruning is expected can be suppressed the vegetative growth rate so that the generative growth rate increases. The purpose of this research is to find out which type and time pruning that can affect peanuts production. This research was conducted in Leuwikopo Experimental Station IPB on November 2020 until March 2021. This research is arranged in split-plot randomized block design with the main plot is the type of pruning and the subplot is time of pruning. The types of pruning are without pruning, main branches pruning, and lateral branches pruning. Time of pruning is when the age of the plant are 6 weeks after planting, 8 weeks after planting, and 10 weeks after planting. The result shows that type of pruning affects the number of lateral branches at week 8, week 10, and week 12. Type of pruning also affects weight of 100 seeds. Time of pruning does not have significant effect on the observed variables. Interaction between the two treatments affect the weight of 100 seeds.
Keyword: generative growth rate, peanuts, productivity, type of pruning

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: 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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