Judul: Effectiveness of Different Levels of Boron on Growth and Production in Indigofera zollingeriana
Abstrak: ABSTRAK TIARA DEVIKA. Efektivitas Boron Berbeda Level Terhadap Pertumbuhan dan Produksi pada Hijauan Indigofera zollingeriana. Dibimbing oleh ASEP TATA PERMANA dan IWAN PRIHANTORO. Penelitian ini bertujuan mengukur efektivitas boron dengan level berbeda dalam mendukung pertumbuhan dan produksi Indigofera zollingeriana pada skala lapang. Penelitian ini menggunakan rancangan acak lengkap dengan 4 perlakuan dan 4 ulangan. Perlakuan terdiri dari P0: Penambahan 0 ppm asam borat, P1, P2, dan P3 berturut-turut penambahan asam borat 300 ppm, 400 ppm, dan 500 ppm. Peubah yang diamati meliputi tinggi tanaman, jumlah cabang, jumlah ranting, diameter batang, jumlah daun, berat segar, dan berat kering tanaman. Data dianalisis menggunakan ANOVA dan perlakuan berbeda nyata akan diuji lanjut dengan uji Duncan menggunakan SPSS versi 25. Hasil penelitian menunjukkan bahwa penambahan asam borat level 300-500 ppm efektif dalam meningkatkan pertumbuhan jumlah cabang, jumlah ranting, jumlah daun, berat segar, dan berat kering I. zollingeriana dibandingkan kontrol (0 ppm) pada skala lapang. Namun, pada penambahan asam borat level 300-500 ppm tidak efektif dalam meningkatkan pertumbuhan diameter batang. Penambahan asam borat level 300 ppm merupakan level optimal dalam menghasilkan pertumbuhan dan produksi I. zollingeriana. Kata kunci: boron, I.zollingeriana, pertumbuhan, produksi, ABSTRACT TIARA DEVIKA. Effectiveness of Different Levels of Boron on Growth and Production in Indigofera zollingeriana. Supervised by ASEP TATA PERMANA and IWAN PRIHANTORO. This research aimed to measure the effectiveness of boron at different levels in supporting the growth and production of Indigofera zollingeriana on a field scale. This study used a completely randomized design with 4 treatments and 4 replications. Treatment consisted of P0: Addition of 0 ppm boric acid, P1, P2, and P3, respectively, addition of 300 ppm, 400 ppm, and 500 ppm boric acid. The variables observed included plant height, number of branches, number of twigs, stem diameter, number of leaves, fresh weight and dry weight of the plant. Data were analyzed using ANOVA and significantly different treatments were further tested using the Duncan test using SPSS version 25. The results showed that the addition of boric acid at a level of 300-500 ppm was effective in increasing the growth of the number of branches, number of twigs, number of leaves, fresh weight and dry weight of I. zollingeriana compared to the control (0 ppm) on a field scale. However, adding boric acid at a level of 300-500 ppm was not effective in increasing stem diameter growth. The addition of boric acid at a level of 300 ppm is the optimal level in producing growth and production of I. zollingeriana. Keywords: boron, growth, I. zollingeriana, production
Keyword: boron, growth, I. zollingeriana, production

Judul: Increasing Rice Yield with Application of Micro Fertilizer B and Zn
Abstrak: Produktivitas padi nasional mengalami penurunan dalam 5 tahun terakhir. Kurangnya pengelolaan hara mikro menyebabkan stagnansi produktivitas tanaman. Zinc (Zn) berperan dalam metabolisme auksin, sintesis klorofil, dan aktivasi enzim. Boron (B) berperan dalam perkembangan polen serta sintesis dan transport karbohidrat. Penelitian ini bertujuan mengetahui pengaruh pemupukan hara mikro B dan Zn terhadap pertumbuhan dan peningkatan hasil padi sawah. Penelitian ini dilaksanakan di Kebun Pendidikan Sawah Baru, Departemen Agronomi dan Hortikultura, IPB pada bulan November 2020 hingga April 2021. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap teracak (RKLT) dua faktor dengan tiga ulangan. Faktor pertama adalah pupuk zinc dengan 4 taraf dosis: 0 kg ha-1, 3 kg ha-1, 4,5 kg ha-1, dan 6 kg ha-1 yang diaplikasikan melalui daun pada 3, 5, dan 7 minggu setelah tanam. Faktor kedua adalah pupuk boron dengan 4 taraf dosis: 0 l ha-1, 0,3 l ha-1, 0,6 l ha-1, dan 0,9 l ha-1 yang diaplikasikan melalui daun pada 8 MST saat fase bunting dan 10 MST saat berbunga 10%. Hasil penelitian menunjukkan aplikasi pupuk B dan Zn tidak berpengaruh terhadap peubah vegetatif maupun komponen hasil dan hasil. Kebutuhan hara B dan Zn cenderung terpenuhi oleh kandungan B dan Zn pada tanah yang sudah tergolong tinggi. Pemupukan Zn cenderung dapat meningkatkan kandungan Zn pada jerami., National rice productivity has decreased in the last 5 years. Lack of micronutrient management causes stagnation of plant productivity. Zinc (Zn) plays a role in auxin metabolism, chlorophyll synthesis, and enzyme activation. Boron (B) plays a role in cell activity and pollen development also synthesis and transport of carbohydrates. The aims of this research to knows the effect of B and Zn micronutrient fertilization on the growth and increase in lowland rice yields. This research was conducted at Sawah Baru Teaching Farm, Department of Agronomy and Horticulture, IPB from November 2020 to April 2021. The experimental design used was a two-factor randomized complete block design (RKLT) with three replications. The first factor was zinc fertilizer with 4 dose levels: 0 kg ha-1, 3 kg ha-1, 4,5 kg ha-1, and 6 kg ha-1 applied through the leaves at 3, 5, and 7 weeks after transplanting. The second factor was boron fertilizer with 4 dose levels: 0 l ha-1, 0.3 l ha-1, 0.6 l ha-1, and 0.9 l ha-1 applied through the leaves 8 weeks after transplanting at booting stage and 10 weeks after transplanting at 10% flowering. The results showed that the application of B and Zn fertilizers had no effect on vegetative variables and yield and yield components. The nutrient needs of B and Zn tend to be met by the high content of B and Zn in the soil. Zn fertilization tends to increase the Zn content of straw.
Keyword: boron, foliar spray, zinc, zn content

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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