Judul: Pengelolaan Organisme Pengganggu Tanaman secara Organis di Pondok Modern Sumber Daya At-Taqwa, Nganjuk, Jawa Timur
Abstrak: Pertanian organik merupakan teknik budidaya pertanian yang menggunakan bahan-bahan alami seperti pupuk organik dan pestisida nabati. Tujuan utama pertanian organik adalah menyediakan produk pertanian, terutama bahan pangan yang aman bagi kesehatan masyarakat, tetap menjaga lingkungan sekitar serta estetika lingkungan. Penelitian ini bertujuan mempelajari sistem budidaya yang diterapkan POMOSDA, mempelajari OPT yang menyerang tanaman budidaya serta cara pengelolaan OPT yang dilakukan. Pengamatan dilakukan pada tanaman hortikultura dan tanaman tahunan. Metode yang dilakukan dalam penelitian ini adalah wawancara civitas pondok pesantren dan pengamatan lapang untuk mengamati keragaman OPT secara visual (langsung). Pengumpulan data dilakukan dengan cara pengamatan langsung dengan mengamati OPT yang terdapat dalam tanaman contoh tersebut. Setelah itu OPT yang ada diidentifikasi. Hasil OPT yang didapat ada 3 jenis yaitu Delphacidae, Tabanidae, dan Scarabaeidae. Pola Tanam Sehat dan Amanah (PTSA) adalah usaha dalam memberdayakan dan mengoptimalkan potensi alam pada pengelolaan terpadu untuk memakmurkan bumi Allah. Keunggulan program ini adalah dapat mempersingkat waktu tanam. Pengendalian yang dilakukan adalah pengendalian preemtif yaitu menghitung kalender tanam, menggunakan pupuk organik cair, penyemprotan pestisida nabati menggunakan barrier dan membuat saluran antar lahan. Pupuk organik cair yang digunakan adalah Manutta Gold. Produk ini dapat digunakan sebagai pupuk organik maupun pestisida nabati. Manutta Gold terbagi menjadi dua jenis, yaitu Manutta Gold Atas dan Manutta Gold Bawah., Organic farming is an agricultural cultivation technique that uses natural ingredients such as organic fertilizers and vegetable pesticides. The main objective of organic agriculture is to provide agricultural products, especially foodstuffs that are safe for public health, while maintaining the surrounding environment and environmental aesthetics. This study aims to study the cultivation system applied by POMOSDA, study the pests that attack cultivated plants and how to manage the pests. Observations were made on horticultural crops and perennial crops. The method used in this study was interviews with the Islamic boarding school community and field observations to observe the diversity of pests visually (directly). Data collection was carried out by direct observation by observing the pests contained in the sample plants. After that the pests are identified. The results there were 3 types of pests is Delphacidae, Tabanidae, and Scarabaeidae. Pola Tanam Sehat dan Amanah (PTSA) are efforts to empower and optimize natural potential in integrated management to prosper God's earth. The advantage of this program is that it can shorten the planting time. The control that is carried out is preemptive control, namely calculating the planting calendar, using liquid organic fertilizers, spraying vegetable pesticides, using barriers and creating channels between fields. The liquid organic fertilizer used is Manutta Gold. This product can be used as an organic fertilizer or as a vegetable pesticide. Manutta Gold is divided into two types, namely Manutta Gold Atas and Manutta Gold Bawah.
Keyword: organic agriculture, pest and disease, pola tanam sehat dan amanah

Judul: Plant Pest Organisms and the Role of POPT in IPM Correctional: A Case Study in Kalijati District, Subang Regency, West Java
Abstrak: Pada tahun 1985 terjadi ledakan serangan hama wereng batang coklat (WBC) yang menyebabkan kerugian besar di daerah sentra padi di Pulau Jawa. Pemerintah menyikapi peristiwa tersebut dengan dikeluarkannya Inpres Nomor 3 Tahun 1986 yang berisi penerapan pengendalian hama terpadu (PHT) yang kemudian mendorong dikeluarkannnya UU Nomor 12 Tahun 1992 yang berisi perlindungan tanaman dilakukan dengan sistem PHT. POPT memiliki peran penting dalam implementasi PHT. Oleh karena itu, pengamatan ini diperlukan untuk mengetahui OPT padi dan peran POPT dalam penerapan PHT. Praktik lapang bertujuan mengamati organisme pengganggu tanaman padi beserta pengendaliannya dan mengamati peran serta program POPT dalam penerapan PHT di Kecamatan Kalijati, Kabupaten Subang, Jawa Barat. Praktik lapang dilakukan di Balai Penyuluhan dan Kantor POPT Kecamatan Kalijati, Kabupaten Subang. Penelitian dilaksanakan pada Juli sampai September 2020. Praktik lapang dilakukan dengan pengamatan keadaan umum lokasi praktik lapang, pengamatan OPT penting, wawancara terstruktur, analisis peran POPT dalam penyuluhan, analisis program khusus POPT, dan analisis data. Hasil pengamatan menunjukkan beberapa OPT penting yang ditemukan di lapangan yaitu: wereng, penggerek batang padi, tikus sawah, penyakit blas, dan penyakit hawar daun bakteri. Pengetahuan responden terhadap jenis OPT dan musuh alami, penggunaan merk dagang pestisida, dan hasil produksi dipengaruhi oleh keikutsertaan petani dalam SLPHT. POPT memiliki peran penting dalam penyuluhan yaitu pada kegiatan Sekolah Lapang PHT. Tahapan yang dilakukan POPT dalam memandu SLPHT yaitu: analisis lapang, penyampaian materi, dan praktik lapang. Persepsi responden terhadap materi, media, dan metode dalam SLPHT dikatakan cukup efektif oleh sebagian besar responden. Program khusus POPT dalam implementasi PHT yaitu perbanyakan agen hayati, pembentukan kelompok tani ramah lingkungan, penyediaan sarana produksi pertanian, dan evaluasi., In 1985, there was an explosion of brown planthopper (WBC) pests which caused huge losses in the rice center areas on the island of Java. The government over come this situation with the issuance of Presidential Instruction Number 3 of 1986, which contained the implementation of integrated pest control (IPM). Furthermore the government then prompted the issuance of Law Number 12 of 1992, as a guidance that plant protection carried out with the IPM system. POPT has an important role in the implementation of IPM. The field practice aims to observe rice pests and their control and to observe the role of the POPT program in implementing IPM in Kalijati District, Subang Regency, West Java. The field practice was carried out at the Extension Center and the POPT Office, Kalijati District, Subang Regency. The research was conducted from July to September 2020. Field practice was carried out by observing the general condition of the field practice location, observing important pests, conducting structured interviews, analyzing the role of POPT in counseling, analyzing POPT special programs, and analyzing data. Observations showed several important pests found in the field, namely: planthopper, rice stem borer, field rat, blast disease, and bacterial leaf blight. Respondents' knowledge of the types of pests and natural enemies, the use of pesticide trademarks, and production yields are influenced by the participation of farmers in SLPHT. POPT has an important role in counseling, namely in IPM Field School activities. The stages carried out by POPT in guiding SLPHT are: field
Keyword: counseling, field school, special program, integrated pest management

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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