Judul: armer Practices in Integrated Pest Control of Brown Planthopper in Cibadak District, Lebak Regency
Abstrak: Kabupaten Lebak menjadi salah satu wilayah sentra penghasil padi di Provinsi Banten. Produktivitas padi pada tahun 2021 mengalami penurunan yang cukup signifikan yaitu sebesar 5,78%. Salah satu OPT yang memiliki intensitas serangan terbesar di Kabupaten Lebak yaitu hama wereng batang cokelat (WBC). Penelitian ini bertujuan memperoleh informasi dan menganalisis hubungan antara pengetahuan, sikap, dan tindakan petani dalam penerapan PHT wereng batang cokelat. Penelitian dilakukan dengan mewawancarai 60 responden di tiga hamparan dengan status serangan wereng batang cokelat berat, sedang dan ringan. Pengolahan data menggunakan SPSS dan Microsoft Excel 2013. Hasil penelitian menunjukkan bahwa petani tergolong memiliki pengetahuan PHT yang cukup baik, sikap yang agak sesuai dengan prinsip-prinsip PHT dan tindakan yang sesuai dengan prinsip-prinsip PHT. Petani pada hamparan dengan tingkat serangan ringan cenderung memiliki pengetahuan, sikap dan tindakan yang lebih baik dibandingkan dengan daerah lain. Pengetahuan, sikap dan tindakan PHT tidak berkaitan dengan umur, pendidikan dan pengalaman bertani, namun berkaitan dengan keaktifan petani dalam Gapoktan dan pekerjaan sampingan petani. Petani yang aktif dalam kegiatan gapoktan memiliki tingkat pengetahuan, sikap dan tindakan lebih tinggi dibandingkan dengan petani yang tidak aktif dalam kegiatan gapoktan. Petani yang memiliki pekerjaan sampingan memiliki tingkat pengetahuan, sikap dan tindakan lebih rendah, dibandingkan dengan petani yang tidak memiliki pekerjaan sampingan., Lebak Regency is one of the central rice-producing areas in Banten Province. Rice productivity in 2021 experienced a significant decline of 5.78%. One of the pests that have the greatest outbreak intensity in Lebak Regency is the brown planthopper. This study aims to obtain information and analyze the relationship between knowledge, attitudes, and actions of farmers in the application of brown planthopper IPM. The study was conducted by interviewing 60 respondents in three stretches with brown planthopper damage status severe, moderate and mild. Data processing using SPSS and Microsoft Excel 2013. The research results show that most farmers having quite good IPM knowledge, attitudes that are somewhat in accordance with IPM principles and actions that are in accordance with IPM principles. Knowledge, attitudes and actions of IPM are not related to age, education and farming experience, but are related to the activeness of farmers in Gapoktan activities and farmers' side jobs. Farmers who are active in farmer's association activities have a higher level of knowledge, attitudes and actions compared to farmers who are not active in farmer's association activities. Farmers who have side jobs have lower levels of knowledge, attitudes and actions, compared to farmers who do not have side jobs.
Keyword: Banten, chi-square, farmer's association, survey

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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