Judul: Pengisian Gabah Beberapa Varietas Padi pada Periode Cekaman Kekeringan Berbeda dalam Sistem Sawah
Abstrak: Rice, the main crop in Indonesia, is facing many problems in its development which is an issue of drought. Effect of drought on rice causes puso and decreases productivity. The objective of this research is to study the response of several varieties of rice grain filling at four different periods of drought. This research was conducted at the University Farm IPB, Babakan, Sawah Baru, Dramaga, Bogor, on land under Polyethylene roof from October 2011 until June 2012. The treatment design Randomized Completely Block Design with Split plot design of two factors. The first factor is period of drought treatments as main plots consist of four standards: dried at 3 weeks after tranplanting (MST) (K3); dried at 6 MST (K6); dried at 9 MST (K9) and control (K0) (without drying). Varieties as a subplot consist of eight standards are: IR-64, Ciherang, IPB 3S, Way Apo Buru, Jatiluhur, Menthik Wangi, Silugonggo and Rokan. Periods of drought affected grain weight and grain number of plant. Varieties affected number of husk of plant. 1000 grain weight was affected by periods of drought stress, varieties and interaction of both.
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Judul: Respon Pengisian Gabah pada Padi yang Mengalami Cekaman Suhu Tinggi
Abstrak: Global warming could imply negative impact on reducing productivity of rice. The aim of this research was to study grain filling response of rice using some rice varieties grown under high temperature stress. The research was conducted at the University Farm IPB, Babakan Sawah Baru, Dramaga, Bogor. Research was perfomed using split plot design with two factors: temperature (main plots) and varieties of IR64, Ciherang, Jatiluhur, and Way Apo Buru (subplot). The results showed that the increasing of average maximum temperature of 4.07°C form 35.44°C to 39.51°C gave the same response of grain filling on each variety. Moreover it was significantly different on the maximum height, full grain at primary tip, and the weight of 1 000 grains at secondary base. High temperature has tendency on the weight of full grain at secondary tip total full grain at primary tip.
Keyword: global warming, grain filling dispersion, grain weight

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