Judul: Uji Daya Hasil Galur-galur Padi Sawah (Oryza sativa) Asal IRRI
Abstrak: To support the increase of rice productivity in Indonesia can be done by using improved rice genotypes obtained from IRRI. The genotypes should have high yield, short growth duration, and resistant to pests and diseases. These lines need to be evaluated in the field. The experiment was conducted to evaluate the yield of some lowland rice lines introduced from IRRI at Balai Besar Penelitian Tanaman Padi Experimental Field, Bogor in November 2013 - April 2014. Experiment used Randomized Complete Blocked Design with single factor and three replications. The factor was lines consisting of lowland rice lines introduced from IRRI, i.e. IR83821-16-2-3-2, IR83821-99-2-2-2, IR84046-10-1-3-2, IR81493-B-B-B-6-B-2-1-2, IR82806-98-3-2-2-2-1, IR83840-90-3-2-1, IR85640-114-2-1-3, IR84778-53-1-2-2-1, IR85627-46-1-2-3, IR80376-12-1-2-3-3, IR78119-24-1-2-2-2, IR10L-130, IR10L-133, IR10L-152, IR10L-135, IR10L-155, and IR10L-139 as well as three national varieties (Inpari 13, Inpari 18 and Ciherang) as checks. The result showed that lines which had the highest productivity was IR83821-99-2-2-2 (3.13 tonnes ha-1), while the line which had the lowest productivity is IR10L-135 (0.84 tonnes ha-1). IR83821-99-2-2-2 line showed higher productivity than the check varieties Inpari 13 and Inpari 18 and was similar to Ciherang.
Keyword: yield trial, productivity, lowland rice, IRRI Introduction

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