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Semuel P. Ratag
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Agriculture, Biological Sciences & Forestry

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RESPON PERKECAMBAHAN BENIH SENGON LAUT (Paraserianthes falcataria (L.) Nielsen) TERHADAP ALELOPATI DAUN DAN RHIZOME ALANG-ALANG (Imperata cylindrica L.) Pangemanan, Euis F.S.; Ratag, Semuel P.
EUGENIA Vol 23, No 1 (2017)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.23.1.2017.15414

Abstract

ABSTRACT   A plant species can release a toxic compound which can inhibit the growthof other plant species.  The success of planting certain tree species, both inside and outside the forest area with agroforestry system can be affected by allelopathy of other plant species. The objective of this research was to study the response of sengon laut (Paraserianthes falcataria (L.) Nielsen) seed germination on cogongrass (Imperata cylindrica L.) leaves and rhizomes allelopathy. The experimental design was a randomized complete design with four replicates.  The treatments were leaves and rhizomes extracts of cogongrass, and water as control.  The results showed that the extract concentration of 20 % (weight/volume), then the sengon laut seed germination was not affected by the extracts. Keywords:  sengon laut, cogongrass, allelopathy, seed germination
KANDUNGAN KLOROFIL DALUGHA (CYRTOSPERMA MERKUSII (HASSK.) SCOTT) PADA HUTAN RAWA PASANG SURUT DI DESA LAINE, PULAU SANGIHE Ratag, Semuel P.; Pangemanan, Euis F.S.; Tasirin, Johny S.
EUGENIA Vol 23, No 1 (2017)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.23.1.2017.15410

Abstract

ABSTRACT This article is to present the adaptation capacity of Dalugha (giant taro, Cyrtosperma merkusii) indicated by chlorophyll contents at a number of places in Laine Village, Sangihe Island.  The study is related to the development of Dalugha as an alternative food plant and its adaptation to the inundated brackish water as a result of raising sea water surface on climate change.  The aim of the study is to analyze the differences in chlorophyll contents of inundated and non inundated brackish water conditions in a tree shaded and non shaded conditions.  The method is observational where plant responses are observed at the variation created by natural caused.  The result showed cthat Dalugha chlorophyll content was influenced by tree shading but it is not influenced by inundation of brackish water. Keywords: dalugha, chlorophyll, tidal swamp forest
ANALISIS VEGETASI HUTAN LINDUNG GUNUNG TUMPA Kainde, Reynold P.; Ratag, Semuel P.; Tasirin, Johny S.; Faryanti, D.
EUGENIA Vol 17, No 3 (2011)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.17.3.2011.3547

Abstract

ABSTRACT   This research was carried out in the Mount of Tumpa Protection Forest from February to March 2003, aiming to asses Important Value (IV) Index.  Simple random sampling with plot was used to collect species data. The observation for collecting specie data was  number individual of each species, trees, poles diameter and species presence.  The data were analysed for density, relatif density, frequency, relatif frequency, dominancy, relatif dominancy and Important Values (IV) The results showed that at seedling level, Important Value of Tepu was the highest  (41,83%) and lowest was Calophyllum soulattri (10,03 %).  The highest Important Value at  the sapling level was Calamus sp (38,73%) and the lowest was Knema latericia (10,11%). The highest  Important Value at the pole level was Spathodea campanulata (74,01%) and the lowest was Dracontomelum mangiverum (10,05%).  The highest Important Value at tree level was Spathodea campanulata (88,86%) and the lowest was Calophyllum soulattri (10,22%). Keywords : Important Value Index, Vegetation Analysis
Co-Authors D. Faryanti Dolame, Yanto Eka Maryuni Toding Euis F. S. Pangemanan Euis F.S. Pangemanan Hengki D. Walangitan Hengki D. Walangitan Ibrahim . Josephus I. Kalangi Kader, Rahmiyanti Kendy H. Kolinug Maria Y.M.A. Sumakud Marthen T. Lasut Martina A. Langi Martina A. Langi Mega Masyita Gusti Mildsty Tarore Rahmiyanti Kader Randi Purba Reynold P. Kainde Reynold P. Kainde Risal Umalekhoa Ruth Polii Sitti S. Umagap Umagap, Sitti S. Wawan Nurmawan Yanto Dolame Yaromi Yoman Yuliyana Christina Laratmase Yusak M. Dori Yusuf L. Tamarol Yusuf L. Tamarol, Yusuf L.