Judul: Yield Trial of 38 New Plant Type Rice in Low Dose Fertilization
Abstrak: Padi merupakan tanaman pangan yang digunakan sebagai pemenuhan kebutuhan karbohidrat utama masyarakat Indonesia. Peningkatan produktivitas padi diperlukan melalui pemuliaan tanaman padi tipe baru untuk memenuhi kebutuhan padi nasional. Penelitian ini bertujuan menguji galur-galur padi sawah tipe baru pada kondisi pemupukan dosis rendah. Penelitian dilaksanakan di Kebun Percobaan IPB Sawah Baru Desa Babakan, Kecamatan Dramaga, Kabupaten Bogor, Jawa Barat sejak Bulan April sampai Juli 2021. Penelitian menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal yaitu terdiri atas 38 galur dan satu varietas pembanding dengan dua ulangan. Hasil analisis ragam pada galur-galur uji memiliki daya hasil yang tidak berbeda nyata dengan varietas pembanding. Namun, terdapat 3 nomor galur yang memiliki daya hasil lebih tinggi serta memiliki karakter agronomi yang lebih baik daripada varietas Ciherang. Galur-galur tersebut adalah IPB187-F-37-1-2 (6,26 ton ha-1), IPB193-F30-2 (6,22 ton ha-1) dan IPB189-F-132-1-1 (6,20 ton ha-1), sedangkan varietas Ciherang sebagai pembanding memiliki daya hasil sebesar 5,87 ton ha-1., Rice is a food crop that is used to fulfill the main carbohydrate needs of the Indonesian people. Increasing rice productivity is needed through breeding of new types of rice plants to meet the national rice needs. This study aimed to evaluate promising lines of rice under low-dose fertilization conditions. The experiment was conducted at the Sawah Baru Experimental Station IPB, Babakan Village, Dramaga, Bogor, West Java, started from April to July 2021. The study used of randomized complete block design (RCBD) single factor consisting of 38 lines and one check variety with two replications. The results showed that yield of the lines evaluated were no significantly different from the check varieties. However, there were 3 lines that had the higher yield and had better agronomic characters than the Ciherang variety. These lines are IPB187-F-37-1-2 (6.26 ton ha-1), IPB193-F-30-2 (6.22 ton ha-1) and IPB189-F-132-1-1 (6.20 ton ha-1), while the Ciherang variety check has a yield of 5.87 tons ha-1.
Keyword: agronomic character, new plant type, yield power

Judul: Yield Trial of New Plant Types Rice Line from Five Populations at Low Dose Fertilization Conditions
Abstrak: Pengujian galur padi merupakan tahap untuk mendapatkan genotipe unggul untuk menghasilkan suatu varietas baru. Penelitian bertujuan menguji daya hasil dan keragaan 37 galur padi sawah bermalai lebat pada kondisi pemupukan dosis rendah. Percobaan dilakukan di Kebun Percobaan IPB Sawah Baru, Bogor menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan dua ulangan. Galur yang diujikan terdiri atas 37 galur padi tipe baru dari lima populasi beserta 2 varietas pembanding yaitu Inpari 32 dan Ciherang. Hasil analisis menunjukkan bahwa galur-galur yang diuji memiliki produktivitas yang setara atau tidak berbeda nyata dengan varietas pembanding. Galur yang memiliki potensi produktivitas lebih tinggi daripada pembanding yaitu IPB193-F-31-1-1 (6,58 ton ha-1), IPB189-F-17-3-2 (6,26 ton ha-1), IPB187-F-117-2-1 (6,74 ton ha-1), dan IPB193-F-4-1-3 (6,28 ton ha-1), sedangkan produktivitas dari varietas pembanding Inpari 32 dan Ciherang sebesar 5,34 ton ha-1 dan 4,40 ton ha-1., Yield trial is one of stage to obtain superior genotypes to produce a new varieties. The research aimed to evaluate the yield and performance of 37 heavy panicle paddy rice lines under low-dose fertilization conditions. The experiment was conducted at the Experimental Station of IPB University, Bogor, using a single factor randomized complete block design (RKLT) with two replications. The lines evaluated consisted of 37 new rice lines from five populations along with 2 check varieties, namely Inpari 32 and Ciherang. The results of the analysis showed that the tested lines had the same productivity or had no significant effect on the check varieties. Lines that have higher productivity potential than the check varieties are IPB193-F-31-1-1 (6.58 tons ha-1), IPB189-F-17-3-2 (6.26 tons ha-1), IPB187-F-117-2-1 (6.74 tons ha-1), IPB193-F-4-1-3 (6.28 tons ha-1), while the productivity of the check varieties Inpari 32 and Ciherang were 5.34 and 4.40 tons ha-1, respectively.
Keyword: new plant type rice, potential genotype, yield trial

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