Judul: Response of Glutinous Rice Varieties (Oryza sativa L.  glutinosa) of N Fertilizer and Plant Spacing Treatments
Abstrak: Penelitian ini dilakukan untuk mempelajari pengaruh jarak tanam dan dosis nitrogen (N) terhadap pertumbuhan dan hasil padi ketan Grendel (Oryza sativa L. glutinosa). Penelitian dilaksanakan di Desa Jatisari, Karawang, Jawa Barat yang berada pada ketinggian 25,6 m dpl pada Januari – Juni 2022. Penelitian menggunakan Rancangan Split Plot dengan dua iiaying perlakuan yaitu jarak tanam sebagai petak utama dan dosis N sebagai anak petak. Faktor perlakuan jarak tanam menggunakan 4 taraf, yaitu jarak tanam 20 cm x 20 cm, 25 cm x 25cm, 30 cm x 30 cm, dan 40 cm x 40 cm. Faktor dosis pupuk 45 kg, 90 kg, 135 kg, 180 kg N ha-1 . Kombinasi perlakuan diulang sebanyak 3 kali. Hasil penelitian menunjukan bahwa jarak tanam 40 cm x 40 cm dan dosis N 180 kg N ha-1 meningkatkan tinggi tanaman, jumlah anakan, warna daun, jumlah anakan produktif, bobot kering sampel, bobot gabah hampa, jumlah bulir per malai, dan hasil ubinan (GKG), This research was conducted to study the effect of plant spacing and nitrogen (N) dose on the growth and yield of Grendel glutinous rice (Oryza sativa L. glutinosa) which was carried out in Jatisari Village, Karawang, West Java (5 – 25.6 m asl). The research was conducted in Januari-Juni 2022. The study used a split plot design with two factors, namely the spacing of the plots as the main plot and the dose of N as the sub-plots. The plant spacing factor used 4 levels, namely the spacing of 20 cm x 20 cm, 25 cm x 25 cm, 30 cm x 30 cm, and 40 cm x 40 cm. The fertilizer dose factor was 45 kg, 90 kg, 135 kg, 180 kg ha-1 . All treatment factors were repeated 3 times. The results showed that a spacing of 40 cm x 40 cm and a dose of N 180 kg ha-1 resulted in higher plant height, number of tillers, darker leaf color, number of productive tillers, dry weight, weight of sterile grain, number of grains per panicle, and yield.
Keyword: Fertilizer dose, glutinous rice, fertilizer application

Judul: Effect of Planting Distance on Growth and Production of Rice (Oryza sativa L.) Bioemas Agritan Variety
Abstrak: Padi (Oryza sativa L.) merupakan sumber karbohidrat penting khususnya bagi masyarakat Indonesia. Kebutuhan beras sebagai bahan pangan masyarakat mengalami peningkatan dari tahun ke tahun karena itu produksi beras perlu ditingkatkan. Penelitian ini bertujuan mempelajari jarak tanam yang tepat pada padi varietas baru yaitu Bioemas Agritan sehingga diperoleh pertumbuhan dan hasil padi yang maksimal. Penelitian dilaksanakan pada November 2022 hingga Mei 2023 di Kebun Percobaan Sawah Baru, dilanjutkan hingga Juli 2023 di laboratorium Pasca panen Departemen AGH, IPB Dramaga, Bogor, Jawa Barat. Penelitian ini menggunakan rancangan kelompok lengkap teracak dengan satu faktor perlakuan yaitu jarak tanam enam taraf. Jarak tanam yang digunakan yaitu jarak 20 cm x 20 cm, 25 cm x 25 cm, 20 cm x 25 cm, 25 cm x 50 cm x 12,5 cm (2:1), 25 cm x 50 cm x 12,5 cm (4:1), 30 cm x 60 cm x 15 cm (4:1). Padi yang digunakan dalam penelitian adalah padi varietas baru yaitu varietas Bioemas Agritan. Hasil penelitian menunjukkan perlakuan jarak tanam pada padi varietas Bioemas Agritan memberikan hasil yang berbeda pada tiap variabel yang diamati. Perlakuan jarak tanam yang diujikan sebagian besar memberikan hasil yang tidak berbeda nyata pada peubah pengamatan kecuali pada peubah tinggi tanaman pada saat 4 MST, jumlah anakan pada saat 5 MST, luas daun dan bobot tajuk dengan hasil yang sangat nyata dan pada peubah jumlah anakan saat 6 MST, panjang malai dan bobot seribu butir memberikan hasil yang nyata. Perlakuan jarak tanam 20 cm x 25 cm menghasilkan produktivitas tertinggi yaitu 6,59 ton ha-1 , namun menurut analisis statistika tidak berbeda nyata dengan perlakuan lainnya., Rice (Oryza sativa L.) is an important source of carbohydrates, especially for the people of Indonesia. The need for rice as food for the community has increased from year to year, therefore rice production needs to be increased. This research aims to study the right planting distance in the new rice variety Bioemas Agritan so as to obtain maximum growth and yield of rice. The research was conducted from November 2022 to May 2023 at the Sawah Baru Experimental Farm, followed by July 2023 at the Post-harvest laboratory of the AGH Department, IPB Dramaga, Bogor, West Java. This study used a randomized complete group design with one treatment factor, namely six levels of planting distance. The spacing used was a distance of 20 cm x 20 cm, 25 cm x 25 cm, 20 cm x 25 cm, 25 cm x 50 cm x 12.5 cm (2:1), 25 cm x 50 cm x 12.5 cm (4:1), 30 cm x 60 cm x 15 cm (4:1). The rice used in the study was a new variety of rice, namely the Bioemas Agritan variety. The results showed that the treatment of plant spacing in Bioemas Agritan rice varieties gave different results on each variable observed. Most of the plant spacing treatments tested gave results that were not significantly different in the observation variables except for the variables of plant height at 4 weeks of planting, number of tillers at 5 weeks of planting, leaf area and crown weight with very real results
Keyword: bioemas agritan, jarak tanam, produksi, produktivitas padi, bioemas agritan, spacing, production, rice productivity

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