Judul: Study of the Morphology, Physiology, and Yield of Soybeans from the Administration of Ameliorant and Arbuscular Mycorrizal Fungi in Ultisol Sijunjung, West Sumatera
Abstrak: Kedelai dikenal sebagai salah satu di antara tanaman pangan populer yang kaya akan protein, namun hingga sekarang pemenuhan kebutuhan akan kedelai khususnya di Indonesia masih menjadi permasalahan besar yang harus ditangani secara tepat. Tujuan dari penelitian ini yaitu untuk mengaji respon morfologi, fisiologi dan hasil kedelai dari aplikasi kalsium karbonat (CaCO3), asam humat dan fungi mikoriza arbuskula (FMA). Pelaksanaan penelitian ini pada Bulan Desember 2022 sampai April 2023 di ultisol Kabupaten Sijunjung, Sumatera Barat. Penelitian disusun menggunakan rancangan spli split-plot dengan tiga ulangan. Faktor pertama yaitu pemberian FMA dan tanpa FMA. Faktor kedua yaitu pemberian asam humat dan tanpa asam humat. Faktor ketiga yaitu dosis CaCO3, masing-masing sebesar 0, ¼, ½, ¾, dan 1  Al-dd. Komponen variabel yang diamati terdiri dari komponen morfologi, fisiologi, dan hasil kedelai. Hasil penelitian menunjukkan bahwa pemberian CaCO3 berpengaruh signifikan terhadap panjang akar, berat kering tajuk, kandungan N-jaringan, pH tanah, dan Al-dd tanah. Pemberian FMA secara mandiri memberikan pengaruh signifikan terhadap persentase kolonisasi FMA. Komponen hasil belum menunjukkan respon yang berbeda nyata dari seluruh perlakuan, namun produktivitas yang dihasilkan dari percobaan ini menunjukkan hasil yang cenderung lebih tinggi 24,85% dari potensi hasil kedelai yang digunakan. Oleh karena itu, penerapan CaCO3 atau asam humat atau bahkan FMA berpotensi menjadi solusi untuk meningkatkan hasil kedelai di tanah ultisol khususnya di Sijunjung, Sumatera Barat. Hal ini menunjukkan bahwa FMA, asam humat ataupun CaCO3 harus dipertimbangkan dalam praktik pertanian di masa depan., Soybean is one of the popular crops that contain high protein, however, until now meeting the need for soybeans, especially in Indonesia is still a big problem that must be handled precisely. This research aims to examine the morphological, physiological, and yield responses of soybeans from the application of calcium carbonate (CaCO3), humic acid, and arbuscular mycorrhizal fungi (AMF). The research was conducted from December 2022 to April 2023 at the ultisol soil of Sijunjung Regency, West Sumatra. The experiment used a split split-plot design with three replications. The first factor was giving AMF and without AMF. The second factor was giving humic acid and without humic acid. The third factor were five different dosages of CaCO3 addition, 0, ¼, ½, ¾, and 1 time of exchangeable Al, respectively. The variable components observed consisted of morphological, physiological, and soybean yield components. The results showed that CaCO3 application significantly affected root length, shoot dry weight, N-tissue content, soil pH, and soil exchangeable Al. The application of AMF independently had a significant effected on the percentage of AMF colonization. The yield components did not show significantly different results from all treatments. However, the productivity resulting from this experiment showed results that tended to be higher than 24,85 % of the potential yield of soybeans used. Therefore, the application of CaCO3 or humic acid or even AMF indenpendently could potentially be a solution to increase soybean yields in ultisol, especially in Sijunjung, West Sumatra. This suggests that the addition of AMF, humic acid, and CaCO3 can increase soybean yield, and should be considered in future farming practices.
Keyword: Al-dd, Kalsium Karbonat, N-jaringan, pH tanah, Ultisol, Al-exch, Calcium Carbonate, N-tissue content, soil pH

Judul: The effect of Dose and Application Method of Lime and Manure of Soybean (Glycine max L. Merr.) with Saturated Soil Culture System on Tidal Swap Land
Abstrak: Kebutuhan kedelai di Indonesia terus meningkat setiap tahunnya seiring dengan meningkatnya jumlah penduduk Indonesia. Pemenuhan kebutuhan kedelai Indonesia masih terpenuhi lewat impor sebesar 2,58 juta ton per tahun. Produksi kedelai dapat ditingkatkan melalui salah satunya pemanfaatan lahan rawa dengan pemberian kapur dan pupuk kandang yang dipadukan dengan cara penempatannya, baik secara sebar maupun di dalam lubang tanam dengan memanfaatkan teknologi budidaya jenuh air. Penelitian ini bertujuan mempelajari pengaruh dosis dan cara pemberian kapur dan pupuk kandang, serta kombinasi yang tepat terhadap pertumbuhan dan produksi kedelai dengan sistem budidaya jenuh air. Penelitian dilaksanakan di Desa Karyabakti, Kecamatan Rantau Rasau, Kabupaten Tanjung Jabung Timur, Provinsi Jambi. Rancangan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) faktorial dengan dua faktor, yaitu faktor pertama berupa kombinasi dosis kapur dan pupuk kandang (0+0, 500+500, 1000+1000, dan 1500+1500 kg ha-1), dan faktor kedua berupa cara pemberian kapur dan pupuk kandang (sebar dan di dalam lubang tanam) dengan tiga ulangan. Hasil menunjukkan bahwa pemberian kapur 1500 kg ha-1 dan pupuk kandang 1500 kg ha-1 yang dikombinasikan dengan pemberian kapur dan pupuk kandang di dalam lubang tanam secara nyata memberikan hasil terbaik dengan produktivitas kedelai mencapai 3,127 ton ha-1., Indonesia's soybeans needs increases every year along with the increasing population of Indonesia. Indonesia's soybean needs are still met through imports of 2,58 million tons per year. Soybean production can be increased by using swap land by giving lime and manure combined by its application method, both in distribution and inside the planting holes by utilizing water-saturated soil culture technology. This study proposed to study the effect of the dose and application method of lime and manure, as well as the right combination on the growth and production of soybeans with a water-saturated soil culture system. The research was conducted in Karyabakti Village, Rantau Rasau District, East Tanjung Jabung Regency, Jambi Province. The research design was a factorial Randomized Complete Block Design (RCBD), the first factor was the dose of lime and manure (0+0, 500+500, 1000+1000, and 1500+1500 kgs ha-1), and the second factor was the method of placing lime and manure (spread and inside the planting holes) with three replications. The results showed that 1500 kgs ha-1 lime dose and manure fertilization dose of 1500 kgs ha-1 combined with lime and manure in the planting hole actually gave the best results with soybean productivity reaching 3,127 tons ha-1.
Keyword: sebar, lubang tanam, produktivitas, spred, planting hole, productivity

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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