Judul: Quality Losses Of Rice Due To Delay In Harvesting And The Use Of Differensial Drying Method (Case Study In Wajo District South Sulawesi)
Abstrak: Delay the harvest are often done by farmers in Wajo, South Sulawesi. It is caused by the lack of manpower and climate change. Delay the harvest can cause quality and quantity loss of grain. The longer of delay harvest resulting a decreased percentage of head grains, increased of broken grains, groats and damage grains. Sun drying after threshing is a hereditary habit of the farmers in Wajo. The objective of this study were to : (1) analyze the effect of delay in harvesting followed by threshing on rice quality losses, (2) analyze the effect of drying with lamporan and tarpaulin on rice quality losses, (3) measure the quality of rice Ciliwung varieties produced, and (4) calculate the economic value added of rice Ciliwung varieties. This study was carried out in Wajo district South Sulawesi, varieties of Ciliwung was selected as sample of rice. The results showed the percentage of damaged and yellow grains without delay (P0) were 2.25 and 0.27%, delayed 3 days (P1) were 5.8 and 0.77%, delayed 6 days (P2) were 6.95 and 1.03%, and delayed 10 days (P3) were 13.25 and 1.48%. The results of quality loss analysis of head grains with 3 days delayed (P1) was 1.29%, 6 days delayed (P2) was 2.82%, and 10 days delayed (P3) was 5.56%. These results showed that the lowest quality loss of head grains 1.76% was drying on lamporan and 3 days delayed (A1P1), while the highest 6.33% on was drying lamporan and 10 days delayed (A1P3). The rice quality measurement of Ciliwung varieties from Wajo district of South Sulawesi was categorized in III, IV and V of rice quality standard based on SNI No. 01-6128-2008. The ratio of value added in postharvest handling of this research was categorized in intermediate economic value added (16 to 40%) and low<15%. The ratio of each treatment were 16.85, 15.13, 10.51, and 7.84%.
Keyword: delay harvesting, grain drying, rice quality, value added

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: 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