Judul: Penggunaan Beberapa Jenis Ekstrak Tumbuhan untuk Menekan Perkecambahan Asystasia intntsa (Forssk.) Blume
Abstrak: Asystasia intrusa (Forssk.) Blume is one of the important weeds in the planting of rubber and palm oil. Asystasia intrusa is regularly controlled by manual or chemical treatment. The spread of A. intrusa seed is very rapid, this is because A. intrusa can produce many seeds. The purpose of this study was to obtain plant extracts that can reduce seed germination of A. intrusa. Plant extracts used were reed (I. cylindrica) rhizomes extract , bandotan (A. conyzoides) leaves extract, kirinyuh (C. odorata) leaves extract, bittervine (M. micrantha) leaves extract and tembelekan (L. camara) leaves extract. Kirinyuh leaves extracts give significant effect on the suppression of germination variables, speed of growth and seedling root length of A. intrusa. But giving some kinds of plant extracts have not been able to provide significant effect on emphasis hypocotyl length. Kirinyuh have the potential to suppress A. intrusa germination.
Keyword: 

Judul: Keefektifan Allelopati Teki ( Cyperus rotundus L.) Terhadap Penekanan Perkecambahan Biji Asystasia gangetica (L.) T. Nama NIM Enderson pada Berbagai Jenis Tanah
Abstrak: Some previous research indicated that allelophatic in nutsedge (Cyperus rotundus) has potential to be used as bioherbicide to suppress broadleaf weed seed germination. The aim of this research was to know the effect of various formulations nutsedge biomass in suppresing Asystasia gangetica germination, which is a serious problem in many plantation. Another purpose of this research was to know effect of different concentration of extract nutsedge to suppressing seed germination of A. gangetica on some types of soil. This research was conducted in Juni-October 2014 in Ecofisiology Plant Laboratory, Agronomy and Horticulture Department. The first experiment using a randomized complete design with 5 treatments formulation nutsedge biomass, these are fresh nutsedge, dried nutsedge, granule, powder and control. The second treatment using factorial randomized complete design with treatment of the extract concentration nutsedge 0 kg l-1, 1 kg l-1, 2 kg l-1, dan 3 kg l-1 and type soils treatment with different clay composition (kuarsa, regosol, andosol, latosol and podsolik). All treatment were conducted in 3 replicates. Result of this research show that all formulation of nutsedge effectively suppress A. gangetica seed germination compared with control. The type of soil gives significant effect on the suppresion of germination A. gangetica seed. In all types of soil application of nutsedge extract showed a tendency that higher concentration of nutsedge extract, higher pressing A. gangetica seed germination.
Keyword: Bogor Agricultural University (IPB), formulation, concentration, bioherbicide, allelophatic

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
Keyword: