Judul: Evaluasi Teknologi Budidaya Padi Adaptif Terhadap Perubahan Iklim
Abstrak: Perubahan iklim memberikan dampak secara langsung pada sektor pertanian. Tujuan penelitian ini untuk mengevaluasi dampak perubahan iklim terhadap pertanaman padi dan mendapatkan kombinasi teknologi budidaya padi yang adaptif terhadap perubahan iklim. Analisis dilakukan dengan menggunakan model DSSAT (Decision Support System fot Agrotechnology Transfer). Teknologi budidaya yang dievaluasi terdiri dari 10 opsi yang disusun berdasarkan hasil survey teknologi budidaya yang digunakan petani dan yang direkomendasikan oleh lembaga penelitian. Evaluasi dampak perubahan iklim dilakukan dengan mengunakan data proyeksi iklim tiga tahun dari skenario RCP 4.5 dan RCP 8.5 yang masing-masing merepresentasikan kondisi iklim normal, ekstrem kering, dan ekstrem basah. Hasil analisis menunjukkan bahwa Perubahan Iklim berpengaruh nyata terhadap hasil tanaman padi dan waktu tanam optimal. Secara umum, pada wilayah penelitian perubahan iklim diperkirakan akan memberikan dampak positif baik pada padi sawah tadah hujan maupun beririgasi untuk hampir semua opsi teknologi apabila waktu tanamnya tepat.
Keyword: DSSAT, perubahan iklim, produktivitas, RCP 4.5

Judul: PenilaianTeknologi Budidaya Padi Sawah Irigasi Adaptif Terhadap Keragaman Iklim (Studi Kasus: Subang, Jawa Barat)
Abstrak: In recent yearsm riceproductivitytended to decrease. Thisconditionis not only due to limited adoption of new technologies by farmers but also due to the increased in crop failure caused by extreme climate events. This study aimsto identify and assess crop management technologiesofirrigatedrice inSubang and to develop crop management strategies more adaptive to climate variability. Assessment of crop management technologies was done using crop simulation (DSSAT) and cost-benefitanalysis, and adaptivefarmingstrategies was developed based on interviews with farmers taking into consideration the results ofthe crop simulation. Crop management technologies being assessed were 18technologies consists of water management,fertilizer application, and crop spacing. The results showedthat theoptimumtechnology at Subang for the irrigated rice is puddlingwithnitrogen application of 150 kg Urea/ha and plant spacing of 40x40cm. The optimumplantingtime is betweenmid-Octoberand mid-January. The B/C ratio for this technology is the highest. Strategy to manage climate risk include not only with structural intervention such as development of community-based water reservoir, wells pump etc, but also with non-structural intervention such as enhancement of farmers capacity in using climate forecast information application for tailoring crop management and cropping pattern to the forecast information.
Keyword: DSSAT, Technology Choice, Rice Irrigation

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