Judul: Evaluation of the Effect of Several Types and Dosage of NPK Compound Fertilizer on Edamame Growth and Productivity
Abstrak: Edamame memiliki berbagai keunggulan seperti ukuran polong dan biji lebih besar, kandungan gizi serta produktivitas yang lebih tinggi dibandingkan kedelai biasa. Selain itu, edamame memiliki peluang pasar dengan permintaan ekspor maupun lokal yang tinggi. Sehingga untuk memenuhi kebutuhan tersebut perlu memperhatikan kecukupan hara melalui pemupukan. Penggunaan jenis dan dosis pupuk NPK secara tepat diharapkan dapat meningkatkan pertumbuhan dan produktivitas edamame. Rancangan percobaan yang digunakan adalah Rancangan Acak kelompok Faktorial dengan dua faktor. Faktor pertama adalah jenis pupuk NPK yaitu NPK (15-15-15) Phonska Plus (J1), NPK (15-15-15) Kebomas (J2), dan NPK (21-7-12) KMAJ (J3). Faktor kedua adalah dosis pupuk yang terdiri dari tiga taraf yaitu 300 kg/ha (D1), 350 kg/ha (D2), dan 400 kg/ha (D3). Perlakuan jenis pupuk, dosis pupuk serta interaksi keduanya tidak berpengaruh nyata terhadap pertumbuhan dan produktivitas edamame. Perlakuan J3D2 memiliki pertumbuhan dan produktivitas lebih baik dibandingkan dengan perlakuan pupuk lainnya. Pemberian berbagai dosis pupuk NPK dan interaksi antara jenis pupuk dan dosis pupuk berpengaruh sangat nyata terhadap serapan hara N dan P tanaman edamame. Perlakuan kombinasi jenis pupuk NPK (15-15-15) Phonska Plus dengan dosis pupuk 400 kg/ha memberikan hasil serapan hara N, P, dan K total tanaman edamame tertinggi dibandingkan dengan perlakuan lainnya., Edamame has various advantages, such as larger pod and seed sizes, nutritional content, and higher productivity compared to ordinary soybeans. Apart from that, edamame has a market opportunity with high exports and local demand. So to meet these needs, it is necessary to pay attention to nutrient adequacy through fertilization. Using the right type and dose of NPK fertilizer is expected to increase the growth and productivity of edamame. The experimental design used was a factorial randomized block design with two factors. The first factor is the type of NPK fertilizer, namely NPK (15-15-15) Phonska Plus (J1), NPK (15-15-15) Kebomas (J2), and NPK (21-7-12) KMAJ (J3). The second factor is the fertilizer dosage, which consists of three levels: 300 kg/ha (D1), 350 kg/ha (D2), and 400 kg/ha (D3). The type of fertilizer, fertilizer dose, and interaction between the two did not have a significant effect on the growth and productivity of edamame. The J3D2 treatment had better growth and productivity compared to other fertilizer treatments. The administration of various doses of NPK fertilizer and the interaction between the type of fertilizer and the fertilizer dose had a very significant effect on the N and P nutrient uptake of edamame plants. The combination treatment of NPK (15-15-15) Phonska Plus fertilizer with a fertilizer dose of 400 kg/ha gave the highest total N, P, and K nutrient uptake of edamame plants compared to other treatments.
Keyword: Glycine max (L) Merrill, Pupuk NPK, Dosis pupuk

Judul: The Effect of Doses of Layer Chicken Manure and Biofertilizers for Growth, Production, and Quality of Edamame Soybeans (Glycine max (L). Merril
Abstrak: Edamame merupakan kedelai polong muda yang dikonsumsi sebagai sayuran (vegetable soybean). Polong dipanen saat kulit polong masih berwarna hijau sebelum menguning, biji berisi penuh, dan memiliki ukuran yang lebih besar serta rasa yang lebih manis dari kedelai biasa. Pupuk hayati dapat ditambah untuk mengurangi kebutuhan pupuk kandang. Penelitian ini dilakukan untuk mengevaluasi pengaruh pemberian pupuk kandang ayam petelur ditambah pupuk hayati untuk pertumbuhan, produksi, dan kualitas kedelai edamame (Glycine max (L). Merril). Percobaan di lapangan dilaksanakan pada bulan Januari sampai April 2023 di Lahan Organik Kebun Percobaan IPB Cikarawang, Bogor. Penelitian ini menggunakan rancangan petak terpisah (split-plot) dengan petak utama yaitu pupuk hayati dan anak petak berbagai dosis pupuk kandang ayam petelur, dengan 3 ulangan. Dosis pupuk kandang yang digunakan yaitu 0, 8, 16, dan 24 ton ha-1. Perlakuan pupuk hayati yaitu pemberian pupuk hayati konsentrasi 10 ml L-1 dan tanpa pemberian pupuk hayati. Hasil penelitian menunjukkan bahwa peningkatan dosis pupuk kandang ayam meningkatkan tinggi tanaman, jumlah daun, luas daun, indeks luas daun, bobot basah dan bobot kering tanaman, jumlah bunga, dan jumlah buku. Komponen produksi yang dipengaruhi dosis pupuk kandang adalah jumlah polong isi, bobot polong isi per tanaman, bobot polong per petak, bobot basah tanaman saat panen, bobot basah 100 biji, dan produktivitas per petak. Pupuk hayati nyata meningkatkan jumlah daun pada 6 minggu setelah tanam (MST) dan kadar hara N-total daun edamame. Interaksi pupuk kandang ayam dan pupuk hayati berpengaruh nyata terhadap jumlah polong isi, jumlah polong isi 2 biji, dan bobot polong isi per tanaman. Jumlah polong isi dan bobot polong isi per tanaman tertinggi pada dosis 24 ton ha-1 pupuk kandang ayam ditambah pupuk hayati. Produktivitas polong edamame tertinggi adalah 11,4 ton ha-1 dengan dosis pupuk kandang ayam 24 ton ha-1. Dosis pupuk kandang yang optimum untuk produktivitas edamame belum diperoleh., Edamame is a young soybean pod that is consumed as a vegetable (vegetable soybean). The pods are harvested when the pods are still green before they turn yellow, the seeds are full, and have a larger size and sweeter flavor than regular soybeans. Edamame soybean can be cultivated organically with high amount of animal manure as nutrient sources. Biofertilizer can be added to reduce the demand of manure. This study was conducted to evaluate the effect of laying hen manure added with biological fertilizer for the growth, production, and quality of edamame soybean. Field experiment was conducted from January to April 2023 at the Organic Field of IPB Experimental Farm, Cikarawang, Bogor. This study used a split-plot design with biofertilizer as the main plot and various doses of laying hen manure as subplots of with 3 replications. The doses of manure were 0, 8, 16, and 24 tons ha-1. The biofertilizer treatment consisted of 10 ml L-1 and without aplication of biofertilizer. The results showed that increasing the dosage of hen manure increased plant height, leaf number, leaf area, leaf area index, fresh weight, dry weight of plants, flower number and node numbers. Yield components were also affected namely numbers of filled pods, weight of filled pods per plant, pod weight per plot, fresh weight of
Keyword: food fiber, filled pods, organic, protein level

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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