Judul: Pengaruh Pupuk Magnesium (Mg) Terhadap Produksi dan Serapan Hara N, P, K, Ca, Mg Tanaman Kacang Hijau di Latosol Darmaga
Abstrak: Magnesium nutrient is a part of chlorophyl substance. The deficiency of Mg in the plant will decrease. The objective of this research was to determine the effect of Magnesium Fertilizer (MgO) on production and uptake of Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca) and Magnesium (Mg) of mung bean plant in Latosol Darmaga. The research design used Randomized Complete Block Design, with consist of 8 treatments were control, NPK Std, NPK Std + Kieserit, NPK Std + MgO 1, NPK Std + MgO 2, NPK Std + MgO 3, NPK Std + MgO 4, NPK Std + MgO 5 with each treatments had 3 replications. The research result showed that the addition treatment of MgO generally increased the plant height and mung bean production (total beans weight /pot and beans weight of 50 grains), especially to the treatment of NPK Std+MgO 3. Analysis of plant and soil showed that the MgO fertilizer tend to reduce content and uptake of Mg in plant leaves, but tend to increase the content and uptake of K and Ca in leaves while treatment of MgO fertilizer significantly increased exchangeable Mg (exch Mg) of soil and whereas exchangeable Ca was not different.
Keyword: 

Judul: Pengaruh pemupukan magnesium terhadap pertumbuhan dan produksi serta serapan beberapa hara tanaman kedelai ( Glycine max L. Merr ) pada latosol Tajur
Abstrak: Penelitian dilaksanakan di Kebun Percobaan IPB, Biotrop, Tajur. Analisis sifat kimia dan fisik tanah dilakukan di Laboratorium Jurusan Tanah dan P3S, IPB. Tujuan penelitian ini adalah untuk memperoleh informasi. dasar mengenai pengaruh unsur Mg terhadap pertumbuhan, hasil dan serapan beberapa hara tanaman kedelai (Glycine max L. Merr). Rancangan penelitian adalah Rancangan Acak Kelompok (RAK). Perlakuan tunggal pupuk Mg dalam bentuk MgSO14 (20.2 persen Mg) diberikan dalam lima takaran, masing-masing sebanyak 0, 0.25, 0.50, 0.75 dan 1.00 me/100g. Pemberian dilakukan dengan cara sebar merata di permukaan tanah. Tanaman uji yang digun: kan adalah kedelai varietas Amerikana. Hasil penelitian menunjukkan bahwa pemupukan Mg ber pengaruh nyata meningkatkan tinggi tanaman umur empat minggu dan sangat nyata umur lima dan enam minggu, sangat nyata meningkatkan berat polong isi, berat biji, berat 1 000 butir biji dan produksi biji per petak serta nyata meningkatkan jumlah polong. Produksi biji tertinggi sebanyak 1506.00 g/petak dicapai pada takaran Mg sebanyak 0.67 me/100g. Serapan Mg dan P meningkat sangat nyata dengan meningkat- nya takaran Mg, sebaliknya terhadap serapan K. Terhadap serapan Ca tidak nyata pengaruhnya. Pemupukan Mg meningkatkan Mgdd hingga takaran 1.00 me/100g dan Kdd hingga takaran 0.25 me/100g, lalu menurunkan pada takaran Mg yang lebih tinggi, sedangkan terhadap Ca dan pH H2O pengaruhnya relatif kecil….
Keyword: 

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