Judul: Knowledge and Practice of Rice Farmers in Pesticide Use in Lamongan Regency, East Java
Abstrak: Penggunaan pestisida merupakan cara yang umum dilakukan oleh petani untuk mengendalikan hama dan penyakit pada tanaman. Aplikasi pestisida harus mengikuti anjuran/rekomendasi yang telah ditentukan. Pengabaian anjuran penggunaan yang benar dapat menyebabkan berbagai dampak negatif. Penelitian ini bertujuan mengetahui tingkat pengetahuan dan tindakan petani padi dalam menggunakan pestisida di Lamongan, Jawa Timur. Penelitian dilaksanakan pada bulan Maret hingga Juni 2021. Penelitian dilakukan dengan metode survei langsung di lapangan menggunakan kuesioner terstruktur untuk mendapatkan data primer. Penentuan lokasi pengambilan contoh dilakukan secara terpilih (purposive) yang didasarkan pada populasi penduduk yang bekerja sebagai petani di tiga kecamatan terpilih lebih banyak daripada kecamatan lainnya. Jumlah petani responden sebanyak 60 petani yang tersebar di tiga kecamatan. Data yang diperoleh dianalisis secara deskriptif untuk mendeskripsikan tingkat pengetahuan dan tindakan petani dalam penggunaan pestisida. Analisis data menggunakan program Microsoft Excel yang disajikan dalam bentuk grafik dan tabulasi. Berdasarkan hasil survei, sebagian besar petani menggunakan pestisida sintetik karena dapat mengendalikan hama dan penyakit lebih cepat. Secara umum para petani memiliki pengetahuan yang baik dalam penggunaan pestisida, namun praktik yang dilakukan petani tidak sesuai dengan pengetahuan mereka. Hal ini dapat disebabkan oleh tingkat pendidikan dan pengalaman bertani responden.
Keyword: negative impact, pesticide use, pest and diseases

Judul: Pengetahuan, Sikap, dan Tindakan Petani Sayuran dalam Penggunaan Pestisida di Kabupaten Pandeglang, Banten.
Abstrak: Pesticide is common techniques used by farmers to control plant pests and diseases. Improper and excessive uses of pesticides often occur in pesticide application due to low farmer’s knowledge and skill. The aim of this study was to obtain information and analyze of the knowledge, attitude, and practice of vegetable farmers in pesticide use in Pandeglang Regency, Banten. This study has been conducted by using direct survey using structured questionnaires to obtain a primary data, while secondary data was obtained from local government and literature study. The survey location was determined by purposive sampling. The number of respondents were 150 vegetables farmers. The data was presented descriptively and analyzed using the χ2 (chi-square) test to analyze the relationship between each characteristic tested. Knowledge, attitude, and practices of vegetable farmers in Jiput, Pulosari, and Menes districts showed some differences. Generally, the farmers at Pulosari district have low rational attitude in the use of pesticides compared with two other districts. Many factors influence the knowledge, attitude, and practices of vegetable farmers in three districts in the use of pesticides. Based on the analysis and relationship tests, factors of age and income of farmers showed influence unsignificantly compared with two other variables such as education and participation of farmers in farmer groups.
Keyword: knowledge, pesticides types, plant pests and diseases, vegetable farmer

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology