Judul: Pengujian Efektifitas Pupuk Hayati Majemuk pada Tanaman Kedelai (Glycine max)
Abstrak: Biofertilizer is made from materials with containing functional bacterias to facilitate nutrient providing for plants. This study aims to evaluate the effective of using biofertilizer on soybean plants (Glycine max). Plant’s biomass and rate of growth were tested and evaluated on field scale. Microbe population was calculated using plate count method. Nitrogen nutrient were analysed using Kjeldahl, and P method using spectrophotometer device. Data were analysed using full random program. The significance rate was evaluated using DMRT 5%. The fertilizer’s dosis are urea 50 kg/ha, SP-36 100 kg/ha, KCl 100 kg/ha and compound biofertilizer 50 kg/ha. Compost’dose and dolomite’s dose are 7.5 ton/ha (dry weight) and 5.79 ton/ha (1.5xAldd) respectively. The results show a real increase of high PH treatment plants during harvest, the plant’s dry weight, nitrogen uptake, the levels of nitrogen, phosphorus uptake, and effective nodule as well as effective than the control and standard fertilizers. Statistically, provision of biofertilizer doesn’t affect the dry weight of wet weight of seed, seed, seed number per plant as well as the weight of 100 seeds compared with standard fertilizers as well as controls. Biological fertilizers tend to increase the population of fungi, bacteria, Rhizobium, and larger than MoPF standard fertilizers. The soil microbe population decreases from 45 DAP into 90 DAP.
Keyword: PSM, Rhizobium, phosphorous, nitrogen, biofertilizer

Judul: The Effect of Chemical Fertilizer Dosage and Type of Biofertilizer on the Growth and Production of Soybean (Glycine max L.)
Abstrak: Kedelai (Glycine max L.) adalah komoditas pangan yang banyak dikonsumsi oleh masyarakat Indonesia. Tingginya kebutuhan kedelai dalam negeri membuat usaha untuk meningkatkan produksi sangat dibutuhkan. Salah satu caranya dengan meningkatkan kesuburan tanah melalui pemupukan. Penelitian ini bertujuan mengetahui pengaruh dosis pupuk kimia dan penambahan pupuk hayati terhadap pertumbuhan dan produksi tanaman kedelai. Penelitian dilakukan di Kebun Percobaan IPB Sawah Baru dari bulan November 2023 hingga Maret 2024. Percobaan menggunakan rancangan Split-Plot RKLT dengan dua faktor yaitu faktor pupuk kimia sebagai petak utama dengan dua taraf, yaitu 50% (K1) dan 100% (K2) dosis dan faktor pupuk hayati sebagai anak petak dengan 5 taraf, yaitu tidak diberi pupuk hayati (H0), pupuk hayati jenis 1 (H1), pupuk hayati jenis 2 (H2), pupuk hayati jenis 3 (H3) dan pupuk hayati jenis 4 (H4). Perlakuan 100% dosis pupuk kimia dapat meningkatkan jumlah daun 8 MST, jumlah cabang 8-10 MST, nilai kehijauan daun, nilai indeks luas daun, bobot brangkasan, jumlah polong dan biji per tanaman, bobot biji per tanaman dan bobot 100 butir. Sementara pupuk hayati jenis 4 dapat meningkatkan jumlah cabang 6-8 MST, jumlah polong dan biji per tanaman, serta indeks luas daun tetapi tidak berbeda nyata dengan pupuk hayati jenis 1,2,3, dan kontrol., Soybeans (Glycine max L.) are a commodity that is widely consumed by Indonesian people. The high level of demand for soybeans in Indonesia make efforts to increase production is necessary. One of the ways to increase soil fertility through fertilizing with biological fertilizer. This research aims to determine the effect of chemical fertilizer doses and the addition of biological fertilizer on the growth and production of soybean plants. The research was conducted at the IPB Sawah Baru Experimental station from November 2023 to March 2024. The experiment used a Split-Plot RCBD design with two factors, namely the chemical fertilizer factor as the main plot with two levels, namely 50% (K1) and 100% (K2) of the dose. optimum and biofertilizer factors as sub-plots with 5 levels, namely no biofertilizer (H0), type 1 biofertilizer (H1), type 2 biofertilizer (H2), type 3 biofertilizer (H3) and type 4 biofertilizer (H4). Treatment 100% dose with chemical fertilizer can increase the number of leaves 8 WAP, number of branches 8-10 WAP, leaf greenness value, leaf area index, dry weight of stover, number of pods per plant, number of seeds per plant, weight of seeds per plant, number of 100 grains. Type 4 biological fertilizer can increase the number of branches 6-10 WAP, number of pods per plant, leaf area index, and number of seeds per soybean plant but is not significantly different from the type 1,2,3 biofertilizer and control.
Keyword: Pupuk hayati, Produksi, detap 1

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