Judul: Pengaruh sistem olah tanah dan pemupukan terhadap pertumbuhan dan produksi beberapa genotipe kedelai di lahan kering masam
Abstrak: Indonesia has quite extensive dry land for the development of the soybean plants. Low of pH and water availability in the dry season are the main factors that become obstacles on planting soybean in dry land. It can be overcome with tolerant genotypes of dry land and cultivation techniques of tillage. The objective of the research was to determine the response of soybean genotypes under cultivation techniques of tillage on acid dry land. The research was conducted at Krawangsari, Natar, South Lampung District, and Lampung Province, Indonesia from June to November 2011. The experiment was performed using a split plot design with three replications. The main-plot of the experiment was soybean genotype consisted of SP-30-4, PG-57-1, Tanggamus and Anjasmoro. The subplot was combination of tillage systems (furrow and convensional) and input types (fertilizers, lime, compost and organic mulch). The results showed that the dry weight, number of fill pods and seed weight per plot were not significantly different among genotypes. Furrow tillage system combined with fertilizers, lime, compost and organic mulch can increase plant nutrient uptake, dry weight, number of fill pods and seed weight per plot.
Keyword: 

Judul: The effect of Dose and Application Method of Lime and Manure of Soybean (Glycine max L. Merr.) with Saturated Soil Culture System on Tidal Swap Land
Abstrak: Kebutuhan kedelai di Indonesia terus meningkat setiap tahunnya seiring dengan meningkatnya jumlah penduduk Indonesia. Pemenuhan kebutuhan kedelai Indonesia masih terpenuhi lewat impor sebesar 2,58 juta ton per tahun. Produksi kedelai dapat ditingkatkan melalui salah satunya pemanfaatan lahan rawa dengan pemberian kapur dan pupuk kandang yang dipadukan dengan cara penempatannya, baik secara sebar maupun di dalam lubang tanam dengan memanfaatkan teknologi budidaya jenuh air. Penelitian ini bertujuan mempelajari pengaruh dosis dan cara pemberian kapur dan pupuk kandang, serta kombinasi yang tepat terhadap pertumbuhan dan produksi kedelai dengan sistem budidaya jenuh air. Penelitian dilaksanakan di Desa Karyabakti, Kecamatan Rantau Rasau, Kabupaten Tanjung Jabung Timur, Provinsi Jambi. Rancangan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) faktorial dengan dua faktor, yaitu faktor pertama berupa kombinasi dosis kapur dan pupuk kandang (0+0, 500+500, 1000+1000, dan 1500+1500 kg ha-1), dan faktor kedua berupa cara pemberian kapur dan pupuk kandang (sebar dan di dalam lubang tanam) dengan tiga ulangan. Hasil menunjukkan bahwa pemberian kapur 1500 kg ha-1 dan pupuk kandang 1500 kg ha-1 yang dikombinasikan dengan pemberian kapur dan pupuk kandang di dalam lubang tanam secara nyata memberikan hasil terbaik dengan produktivitas kedelai mencapai 3,127 ton ha-1., Indonesia's soybeans needs increases every year along with the increasing population of Indonesia. Indonesia's soybean needs are still met through imports of 2,58 million tons per year. Soybean production can be increased by using swap land by giving lime and manure combined by its application method, both in distribution and inside the planting holes by utilizing water-saturated soil culture technology. This study proposed to study the effect of the dose and application method of lime and manure, as well as the right combination on the growth and production of soybeans with a water-saturated soil culture system. The research was conducted in Karyabakti Village, Rantau Rasau District, East Tanjung Jabung Regency, Jambi Province. The research design was a factorial Randomized Complete Block Design (RCBD), the first factor was the dose of lime and manure (0+0, 500+500, 1000+1000, and 1500+1500 kgs ha-1), and the second factor was the method of placing lime and manure (spread and inside the planting holes) with three replications. The results showed that 1500 kgs ha-1 lime dose and manure fertilization dose of 1500 kgs ha-1 combined with lime and manure in the planting hole actually gave the best results with soybean productivity reaching 3,127 tons ha-1.
Keyword: sebar, lubang tanam, produktivitas, spred, planting hole, productivity

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