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: Pengetahuan, Sikap, dan Tindakan Petani dalam Pengendalian Hama Terpadu Tanaman Padi di Kecamatan Malingping, Kabupaten Lebak, dan Kecamatan Petir, Kabupaten Serang.
Abstrak: As the main food crop, rice plays a pivotal role on supporting physiological needs of Indonesian society as well as has high economic value. In order to increase rice yield, farmers have several obstacles to confront such as decreasing land productivity, climate change and outbreak of pest and disease. The problem of pest and diseases inflict a financial loss of farmers, therefore it needs appropriate strategyto control it in order to minimizing the damage. Integrated pest management (IPM) is a comprehensive approach to control pest and disease that had been stated in government policy and environmental friendly. Unfortunately, although the government had socialized to the farmers, the implantation of IPM is still rare. The objective of this research is to study the level of knowledge, attitude, problems and action of farmers on cultivation management of rice including the strategy in controlling pest and disease. The research was conducted in Subdistrict of Malingping (Lebak Regency) and Petir (Serang Regency), Banten Province from May to June 2012. The data was collected by direct interview to the farmers using questionnaire. The result showed that the knowledge of farmers on rice cultivation management was based on heredity knowledge from their ancestor as well as developed from their own experience. Generally, the farmers in Malingping and Petir do not familiar with IPM, this is based on information from the farmers that they did not receive education about IPM from Indonesian government. In fact, the farmer is aware about the important of using healthy seeds, monitoring pest and disease, utilizing natural enemies and using pesticide wisely, that those are important aspect on IPM. In the management of cultivation, the farmers still depend on synthetic pesticide to control pest and disease due to practically simple to apply. Related to climate problem, the farmers tend to defenseless and do nothing without preventive or adaptive approach such as plant rotation that recommended by government.
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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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