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: Pests and Diseases of Glutinous Rice Cv. of  Grendel at Various Plant Spacing, Nitrogen and Potassium Fertilizing Doses.
Abstrak: Pemupukan dan pengaturan jarak tanam merupakan aspek penting untuk produksi padi. Penelitian bertujuan mengkaji pengaruh jarak tanam, pemupukan Nitrogen dan Kalium terhadap populasi atau tingkat serangan hama dan penyakit padi. Penelitian dilakukan di Desa Kiarasari, Kecamatan Compreng, Kabupaten Subang pada bulan November 2022 sampai dengan Januari 2023 menggunakan rancangan acak kelompok dengan empat taraf pemupukan dan dua taraf jarak tanam. Hasil penelitian menunjukkan ada pengaruh nyata pemupukan dan jarak tanam terhadap tingkat serangan penggerek batang padi kuning, blas daun, dan hawar daun bakteri, tidak berpengaruh nyata terhadap populasi wereng batang cokelat dan jumlah kelompok telur penggerek batang. Perlakuan yang berpengaruh nyata menurunkan serangan penggerek batang padi kuning adalah F3T2 (90 kg/ha N + 35 kg/ha K dan 50 cm x 25 cm). Perlakuan yang berpengaruh nyata menurunkan keparahan penyakit blas daun adalah F4T2 (135 kg/ha N + 52,5 kg/ha K dan 50 cm x 25 cm). Perlakuan yang berpengaruh nyata menurunkan keparahan keparahan penyakit hawar daun bakteri adalah F2T1 (45 kg/ha N + 17,5 kg/ha K dan 40 cm x 40 cm) dan F3T1 (90 kg/ha N + 35 kg/ha K dan 40 cm x 40 cm)., Fertilizing and plant spacing are important aspects for rice production. The research aims to examine effect of plant spacing, Nitrogen and Potassium fertilizing on the population or damage level by rice pests and diseases. The research was conducted in Kiarasari Village, Compreng District, Subang Regency from November 2022 to January 2023 using a randomized block design with four levels of fertilizing and two levels of plant spacing. The results showed that there was a significant effect of fertilization and plant spacing on the level of damage by stem borers, leaf blast, and bacterial leaf blight, but had no significant effect on the population of brown planthoppers and the number of stem borer egg clusters. The treatment that has a significant effect on reducing yellow rice stem borer attacks was F3T2 (90 kg/ha N + 35 kg/ha K and 50 cm x 25 cm), on reducing leaf blast severity was F4T2 (135 kg/ha N + 52.5 kg/ha K and 50 cm x 25 cm), and on reducing bacterial leaf blight severity were F2T1 (45 kg/ha N + 17.5 kg/ha K and 40 cm x 40 cm) and F3T1 (90 kg/ha N + 35 kg/ha K and 40 cm x 40 cm).
Keyword: blas daun, hawar daun bakteri, penggerek batang padi, bacterial leaf blight, leaf blast, rice stem borer

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