Judul: Pengaruh Pemupukan N, P, Dan K Terhadap Kandungan Klorofil, Karoten, Dan Vigor Daya Simpan Benih Kedelai (Glycine Max.(L.) Merr.)
Abstrak: Success of a development program on soybean production must not be separated from the quality of seeds used. Moreover, seeds determine the success of soybean production up to 95%. Therefore, it is necessary to study the effect of N, P, K fertilization on the chlorophyll and carotene content, and seed vigor on soybean in order to look for a correlation between them. The research was conducted at IPB Experiment Station in Leuwikopo and Seed Technology Laboratory, IPB on February until July 2011. The design used in this experiment was Split Plot Design. The first factor was soybean varieties (Anjasmoro and Detam 1). The second factor was NPK fertilization (without fertilizer, NPK, NP, NK, and PK). Observations included vegetative observations and production of seed, chlorophyll and carotene content, potential viability, and storability vigor of the seeds. The results of this research showed that there was a relationship between fertilization variations factor of N, P and K significantly affect chlorophyll and carotene content which determine seed quality. Detam 1 showed that chlorophyll and carotene content was higher than Anjasmoro. Detam 1 was fertilized NK contained highest carotene (8.31 mol/100gram), whereas Detam 1 without fertilizer showed the lowest ones (1.80 mol/100gram). The highest chlorophyll content presented in Detam 1 without fertilization (4,61 mol/100gram), while the lowest was Detam 1 with NK fertilization (0.89 mol/100gram). Treatment of varieties and fertilizer affect on storability vigor of soybean seeds through chemical deterioration. Application Detam 1 without fertilizer showed highest vigor storability up to (72%), whereas Anjasmoro without fertilizer treatment has lowest vigor storability (13.33%.) Electroconductivity is not affected by the provision of fertilizer and varieties but affected by the interaction of both. Correlation was found between chlorophyll content toward seed storability vigor 0.75371*
Keyword: 

Judul: The Effect of Doses of Phosphorus and Potassium Fertilizers on the Growth and Production of Soybean (Glycine max (L.) Merrill)
Abstrak: Kedelai merupakan salah satu komoditas prioritas yang diupayakan untuk ditingkatkan produksinya guna mengurangi impor. Upaya peningkatan produksi nasional kedelai di antaranya perbaikan teknik budi daya melalui pengaturan pupuk. Pupuk fosfor (P) dan kalium (K) menjadi salah satu pupuk dasar yang dibutuhkan untuk budi daya kedelai. Penelitian ini bertujuan mendapatkan informasi mengenai pengaruh dosis pupuk P dan K terhadap pertumbuhan dan produksi kedelai. Penelitian dilakukan di Kebun Percobaan IPB Sawah Baru dari bulan September hingga Desember 2021. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) dengan dua faktor percobaan, yakni dosis pupuk P (0, 50, 100, dan 150 kg SP-36 ha-1) dan dosis pupuk K (0, 100, dan 150 kg KCl ha-1). Varietas yang digunakan adalah Anjasmoro. Hasil penelitian menunjukkan pemberian pupuk P mempercepat umur panen serta menaikkan indeks luas daun, nilai kehijauan daun fase R1, bobot kering tajuk, laju pertumbuhan tanaman fase R5−R8, bobot biji per tanaman, bobot ubinan, dan potensi hasil kedelai. Dosis 150 kg SP-36 ha-1 menghasilkan bobot biji per tanaman, bobot ubinan, dan potensi hasil tertinggi dibanding dosis lainnya. Hasil panen perlakuan pupuk P 100 kg SP-36 ha-1 dan 150 kg SP-36 ha-1 melampaui potensi hasil varietas. Pemupukan K memperpanjang fase pengisian polong (R5) dan meningkatkan tinggi tanamana pada 9 MST, bobot kering tajuk, bobot biji per tanaman, bobot 100 butir, bobot ubinan, dan potensi hasil kedelai. Dosis 150 kg KCl ha-1 menghasilkan komponen produksi kedelai tertinggi dibanding dosis lainnya., Soybean is one of the priority commodity which production is being increased in order to reduce imports. Efforts to increase national soybean production by improving cultivation techniques through fertilizer regulation. Phosphorus (P) and potassium (K) fertilizers are one of the basic fertilizers needed for soybean cultivation. This research aims to obtain information on the effect of doses of P and K fertilizers on soybean growth and production. The research was conducted at Sawah Baru Experimental Field and Post-harvest Laboratory of IPB University from September to December 2021. This research used a randomized complete block design (RCBD) with two experimental factors, the dose of P fertilizer (0, 50, 100, and 150 kg SP-36 ha-1) and the dose of K fertilizer (0, 100, and 150 kg KCl ha-1). Variety used was Anjasmoro. The results showed that the application of P fertilizer accelerated harvest age and increased leaf area index, leaf greenness in R1 phase, culm and leaf dry weight, rate of plant growth in R5−R8 phase, weight of seeds per plant, tile weight, and soybean yield potential. A dose of 150 kg SP-36 ha-1 produced the highest weight of seeds per plant, tile weight, and yield potential compared to other doses. The yields of fertilizer treatments of P 100 kg SP-36 ha-1 and 150 kg SP-36 ha-1 exceeded the yield potential of the variety. K fertilization extended age of pods filling (R5) and increased plant height at 9 WAP, culm and leaf dry weight, weight of seeds per plant, weight of 100 seeds, tile weight, and soybean yield potential. The dose of 150 kg KCl ha-1 resulted in the highest soybean production component compared to other doses.
Keyword: age of pods filling, culm and leaf dry weight, harvest age, seed weight, yield potential

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.
Keyword: