Judul: Analisis Skenario Tanam dan Pemetaan Lahan Kedelai Berdasarkan Ketersediaan Air Tanah di Kabupaten Tanjung Jabung Barat
Abstrak: Availability of soil water affect the growth, development, and productivity of soybean plants. The purpose of this study were to analyze the soil water availability in Tanjung Jabung Barat Regency using SWAT, mapping suitable land, and to analyze soybean planting scenario. Soil water availability was calculated by SWAT model, and land mapping was conducted based on crop water requirement of soybean. The result of SWAT simulation showed that the soil water availability in field capacity on 155 subbasin were 5 - 352.3 mm, with the planting period 90 days. Water deficits months were August and September. Water requirement for soybean was 250-317 mm per planting scenarios. Land mapping for soybean produced 12 planting scenarios with the area of sufficient and unsufficient soil water availability. The area with sufficient soil water availability had a small surface and located in West side of Tanjung Jabung Barat Regency. The best planting scenario was scenario 11 (November – January) with the minimum water requirement of 249.7 mm.
Keyword: crop water requirement, planting scenario, soil water, soybean, SWAT

Judul: Analisis Skenario Tanam dan Pemetaan Lahan Kedelai Berdasarkan Ketersediaan Air Tanah di Kabupaten Tanjung Jabung Barat.
Abstrak: Ketersediaan air dalam tanah mempengaruhi pertumbuhan, perkembangan, dan produktivitas tanaman kedelai. Tujuan penelitian ini adalah untuk menganalisis ketersediaan air tanah di Kabupaten Tanjung Jabung Barat menggunakan SWAT, melakukan pemetaan kesesuaian lahan, dan menganalisis skenario jadwal tanam kedelai. Perhitungan ketersediaan air tanah dilakukan dengan simulasi SWAT, dan pemetaan lahan mengacu pada kebutuhan air tanaman kedelai. Berdasarkan hasil simulasi SWAT, ketersediaan air tanah pada kondisi kapasitas lapang di 155 titik subbasin berkisar antara 5 - 352.3 mm dengan periode tanam 90 hari. Terdapat bulan defisit air, yaitu pada bulan Agustus dan September. Dari hasil perhitungan, kebutuhan air kedelai berkisar antara 250-317 mm per skenario tanam. Pemetaan lahan menghasilkan 12 skenario tanam dengan wilayah yang memiliki ketersediaan air cukup dan tidak cukup. Luasan wilayah dengan ketersediaan air yang mencukupi kecil dan terletak pada sebagian kecil sisi Barat Kabupaten Tanjung Jabung Barat. Skenario tanam kedelai terbaik adalah skenario tanam 11 (November - Januari) dengan kebutuhan air tanaman minimum 249.7 mm.
Keyword: air tanah, kebutuhan air tanaman, kedelai, skenario tanam, SWAT

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