Judul: Application of liquid bio-fertilizer reduced The need of chemical fertilizer in black Galingale (kaempferia parviflora) production
Abstrak: Kaempferia parviflora Wall ex. Baker (black galingale) is a medicinal plant which has high potential to be developed in Indonesia as medicinal products. Thus, in order to develop appropriate standard operasional procedure in K parviflora cultivation, this research was conducted to study the effect of biofertilizer applicationon late-vegetative growth and yield of rhizome. The experiment was arranged in Randomize Completely Block Design (RCBD), where the treatment were Control (0 L ha-1 of bio-fertilizer and 100% of chemical fertilizer), D1 (15 L ha-1 of bio-fertilizer and 50% of chemical fertilizer), D2 (22.5 L ha-1 of bio-fertilizer and 50% of chemical fertilizer), and D3 (30 L ha-1 of biofertilizer and 50% of chemical fertilizer). The 100% chemical fertilizer application were consisted 300 kg ha-1 urea, 250 kg ha-1 SP-36, and 250 kg ha-1 KCl. The block of the experimental design was based on the shading position of raised bed and difference of sun-lighting time. The result showed that application of 15 L ha-1 of bio-fertilizer and 50% of chemical fertilizer resulted in the best late-vegetative growth (i.e. plant height, leaf number, leaf length, and leaf area) of K. parviflora up to 29 week after planting (WAP). Moreover, application of 50% of chemical fertilizer with various rate of bio-fertilizer resulted in similar rhizome yield compared to those planted with 100% of chemical fertilizer. Thus, application of bio-fertilizer can be recommended to be applied in K. parviflora cultivation since it could reduce the usage of chemical fertilizer (urea, SP 36, and KCl) up to 50%. The potencial productivity from each treatment range from 4.38 to 8.19 ton ha-1. The result also imply that the usage of bio-fertilizer could suppress disease severity of root-knot caused by nematode in the field.
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Judul: Inisiasi Rimpang Mikro Kaempferia parviflora Secara In Vitro dengan Penambahan BAP dan Sukrosa
Abstrak: Kaempferia parviflora is a medicinal plant that contains secondary metabolites and efficacious for treating various diseases. Rapid multiplication of K. parviflora through its rhizome is hamprered by the long period needed to produce the rhizome. The objectives of this research were to obtain the best sucrose concentration and to determine the best BAP concentration in the in vitro micro rhizome initiation of K. parviflora. The experiment was arranged in a randomized complete block design with two factors and three replications. The first factor was BAP concentration, consisted of three levels i.e. 0, 2, and 4 mg L¯1. The second factor was sucrose concentration, consisted of four levels i.e. 0, 30, 60, and 90 g L¯1. Data obtained were analyzed by F-test, followed by DMRT (Duncan Multiple Range Test) at 5 % significant level. Sucrose concentration significantly affected the number of shoots and plantlets fresh weight. The results showed that K. parviflora could form micro rhizome in vitro, as indicated by the similar anatomical structure compared to the rhizome produced in vivo. K. parviflora cultured in MS medium cointaining 90 g L¯1 sucrose without BAP had the highest number of micro rhizome at 8 WAC.
Keyword: Bogor Agricultural University (IPB), traditional medicine, black galingale, health

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