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PERTUMBUHAN BIBIT SENGON (Paraserianthes falcataria) PADA BERBAGAI MEDIA TUMBUH Sukarman, Sukarman; Kainde, R.; Rombang, J.; Thomas, A.
EUGENIA Vol 18, No 3 (2012)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.18.3.2012.4104

ABSTRACT Â This research was carried out in Silviculture Laboratory, Agriculture Faculty, Sam Ratulangi University, from April to June 2012. The aim of this was to examine the influence of growth media combination on height, diameter and number of leaf sengon seedling, using a Randomized Complete Design with one factor. The factor isÂ top soil, top soil and sekam bakar, and top soil and coco peat. Based on the research, the results of Anaslysis of Variance showed that top soil and combination of top soil and sekam bakar give most number of seedling leaf.Â However, growth of height and diameter at all of combination was no significant, but there was trend that top soil give best growth of height and best growth of diameter given by the top soil and combination of top soil and sekam bakar. Keywords : growth media, sengon ABSTRAK Penelitian ini dilaksanakan di Laboratorium Silvikultur, Fakultas Pertanian, Universitas Sam Ratulangi, pada bulan April - Juni 2012. Tujuan dari penelitian ini untuk mengetahui pengaruh kombinasi media tumbuh terhadap pertumbahan tinggi, diameter dan jumlah daun bibit sengon, dengan menggunakan Rancangan Acak Lengkap (RAL) satu faktor. Faktor tersebut adalah tanah lapisan atas, campuran tanah lapisan atas dengan pasir, campuran tanah lapisan atas dengan sekam bakarÂ dan campuran tanah lapisan atas dengan coco peat. Berdasarkan hasil penelitian, bahwa hasil sidik ragam menunjukkan media tumbuh tanah lapisan atas dan media tumbuh campuran tanah lapisan atas dengan sekam bakar menunjukkan pertumbuhan jumlah daun bibit sengon ang terbanyak. Sedangkan pertumbuhan tinggi dan diameter pada berbagai media yang diuji tidak berbeda nyata, tapi kecendrungan pertumbuhan tinggi tanaman terbaik ditunjukan pada media tumbuh tanah lapisan atas dan pertumbuhan diameter terbaik di tunjukkan pada media tumbuh tanah lapisan atasÂ dan campuran tanah lapisan atas dengan sekam bakar. Kata kunci : media tumbuh, sengon

KESESUAIAN LAHAN TANAMAN JAGUNG DI KABUPATEN MINAHASA SELATAN Rogi, J. E.X.; Rombang, Johan A.; Kalangi, Josephus I.; Taher, Malsupri
EUGENIA Vol 13, No 3 (2007)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.13.3.2007.7387

ABSTRACT Â Rogi, J.E.X. et. al. 2007. The Suistability Land for Corn in the South Minahasa District. Eugenia 13 (3) : 320-326. Based on agri-climate and market prospective, corn is a potential comodity in the South-Minahasa District. From 215.000 ha of South-Minahasa District area, it has 18.437 ha harvest-area and in 2006 produced 52.747 tonnes corn. The above data showed that this district has a possibility to extend the corn planting area in suitable area. To find this suistability area for corn, a spatial data was composed based on soil and climate data using Geographic Information Systemm (GIS). Soil data consisted of texture, pH, C-organic, and cation exchange capacity (CEC), whereas climate data consisted of rainfall and air temperature. Spatial data in the form of land suitability map for corn in the South-Minahasa District was analysed using ArcViewer 3.2. software. Â Keywords: Harvest area, soil and climate, spatial data, GIS, ArcViewer 3.2

MODELING TUTUPAN LAHAN di DAS TIKALA BERDASARKAN KAPASITAS SALURAN SUNGAI TIKALA Telah, Heinsy A.J.; Rombang, J. A.; Walangitan, H. D.
EUGENIA Vol 24, No 2 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.24.2.2018.22805

ABSTRACTÂ Tikala river is the main channel of Tikala watershed. Tikala watershed covers an area of 9215,89 kmÂ² and the length of the main river is 23,73 km. The decline in Tikala watershed quality is marked by high fluctuations of river debit, the increase of erosion and sedimentation rates, and destructive flood. Comparing to floods caused by other rivers in Manado city, flood caused by Tikala river on the 15th January 2014 was the worst case. For this reason, research was conducted to analyze the capacity of river channels in three sampling spots, chosen through purposive sampling methods, and to model types of landuse suitable to the capacity of river channels. Results of river channel capacity analysis at 3 sampling spots using Manning's equation were 45,29 m3/s, 131,58 m3/s, and 36,39 m3/s. Five models of landuse were carried out for Tikala Watershed and the most suitable landuse model is the 4th type in which open area, dry agriculture, and 4.099 ha of dry agriculture mixed with shrubs were converted into an agroforestry system.Keywords: watershed, river capacity, modeling

PERTUMBUHAN BIBIT SENGON (Paraserianthes falcataria) PADA BERBAGAI MEDIA TUMBUH Sukarman, Sukarman; Kainde, R.; Rombang, J.; Thomas, A.
EUGENIA Vol 18, No 3 (2012)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.18.3.2012.4103

ABSTRACT Â This research was carried out in Silviculture Laboratory, Agriculture Faculty, Sam Ratulangi University, from April to June 2012. The aim of this was to examine the influence of growth media combination on height, diameter and number of leaf sengon seedling, using a Randomized Complete Design with one factor. The factor isÂ top soil, top soil and sekam bakar, and top soil and coco peat. Based on the research, the results of Anaslysis of Variance showed that top soil and combination of top soil and sekam bakar give most number of seedling leaf.Â However, growth of height and diameter at all of combination was no significant, but there was trend that top soil give best growth of height and best growth of diameter given by the top soil and combination of top soil and sekam bakar. Keywords : growth media, sengon ABSTRAK Penelitian ini dilaksanakan di Laboratorium Silvikultur, Fakultas Pertanian, Universitas Sam Ratulangi, pada bulan April - Juni 2012. Tujuan dari penelitian ini untuk mengetahui pengaruh kombinasi media tumbuh terhadap pertumbahan tinggi, diameter dan jumlah daun bibit sengon, dengan menggunakan Rancangan Acak Lengkap (RAL) satu faktor. Faktor tersebut adalah tanah lapisan atas, campuran tanah lapisan atas dengan pasir, campuran tanah lapisan atas dengan sekam bakarÂ dan campuran tanah lapisan atas dengan coco peat. Berdasarkan hasil penelitian, bahwa hasil sidik ragam menunjukkan media tumbuh tanah lapisan atas dan media tumbuh campuran tanah lapisan atas dengan sekam bakar menunjukkan pertumbuhan jumlah daun bibit sengon ang terbanyak. Sedangkan pertumbuhan tinggi dan diameter pada berbagai media yang diuji tidak berbeda nyata, tapi kecendrungan pertumbuhan tinggi tanaman terbaik ditunjukan pada media tumbuh tanah lapisan atas dan pertumbuhan diameter terbaik di tunjukkan pada media tumbuh tanah lapisan atasÂ dan campuran tanah lapisan atas dengan sekam bakar. Kata kunci : media tumbuh, sengon

ANALISIS KEMAMPUAN VEGETASI DALAM MEREDAM KEBISINGAN Putra, Imam Syah; Rombang, J. A.; Nurmawan, W.
EUGENIA Vol 24, No 3 (2018)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.24.3.2018.22660

ABSTRACTÂ Noise is one of the environmental problems that is often overlooked. To solve an environmental problems like this, vegetation is considered as the most effective and efficient noise damper. This research was conducted in Warembungan Village, Pineleng District, Minahasa Regency from May to July 2018, using the 3 factor factorial field experiment method in a Randomized Block Design, 3 main factors are vegetation canopy cover level, rotation per minute (RPM) rate of sound source, and distance level. The vegetation canopy cover level was determined purposively.The aim of this research to determine the capacity of various level of vegetation canopy coverage to reduce noise at various levels of noise. The role of vegetation in reducing noise depends on the coverage of vegetation canopy. At low level coverage of vegetation canopy, noise decreases about 1.25 dBA or 1.69% lower than the noise recorded without vegetation coverage. at the middle level coverage and high level coverage of vegetation canopy, the noises decrease aboutÂ 2.46 dBA (or 3.32% lower) and 5.72 dBA (or 7.82% lower) respectively. Keywords: sound, noise, vegetation, canopy cover

KANDUNGAN UNSUR HARA PADA SERASAH DAUN SEGAR POHON (MAHONI, NANTU DAN MATOA) Wowor, Andre E.; Thomas, A.; Rombang, J. A.
EUGENIA Vol 25, No 1 (2019)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.25.1.2019.31395

Plant life cycle requires adequate nutrient content in the planting media environment. Nutrients are naturally influenced by cyclical nutrition itself. Plants in the form of trees play a role in the synthesis of nutrients themselves. Trees play a role in absorbing nutrients in the soil and releasing nutrients through dead or harvested tissue, plant tissues that are most often canceled or killed because the weather is leaves. The nutritional needs of trees are different so the absorption, use and management of nutrients in trees is also different. The purpose of this study is to see the differences in species of Mahogany, Nantu and Matoa trees, which has the potential to contribute to the availability of nutrients. The method used in the study was a completely randomized design (CRD) with three replications. Analysis of nutrient N, P and K was carried out in the laboratory using extraction of perhydrol by wet ingestion of H2SO4+H2O2. The results of the research obtained, that the fresh leaf litter of the nantu tree is the most potential as a nutrient-contributing tree to the surface soil.

Laju Tumbuh Umbi Tanaman Kentang Varietas Granola dan Supejohn di Dataran Medium dengan Pemulsaan Johannes E. X. Rogi; Hanny S. G. Kembuan; Johan A. Rombang
Jurnal Hortikultura Indonesia Vol. 7 No. 2 (2016): Jurnal Hortikultura Indonesia
Publisher : Indonesian Society for Horticulture / Department of Agronomy and Horticulture

ABSTRACTResearch on growth rate of two cultivars of potato c.v. Granola and Supejohn at medium altitude using mulching methods was conducted at Paslaten village, Subdistrict of West Langowan, District of Minahasa, North Sulawesi. Research location was at medium altitude of 750 m above sea level. The objectives of this research were to determine growth rate of potato tuber grown at medium altitude and the most suitable mulch. The research was arranged in a randomized complete block design with two treatments and three replications. The first factor was potato cultivars (Granola and Supejohn) and second factor was mulching methods (no mulch, straw mulch and black silver plastic). Research result showed that straw mulch treatment increased growth rate of Granola and Supejohn cultivars 0.87 g plant-1 day-1 and 0.73 g plant-1 day-1, respectively while black silver plastic treatment only increased the growth rate of Granola and Supejohn cultivars 0.70 g plant-1 day-1and 0.59 g plant-1 day-1, respectively. The highest tuber dry weight was achieved by straw mulch. The best treatment was Granola grown in straw mulch. The lowest growth rate occurred at the mulch treatment which were 0.49 g plant-1 day-1 for Granola cultivar and 0.47 g plant-1 day-1 for Supejohn cultivar.Keywords: black silver plastic mulch, dry weight, growth rate, potato, straw mulch ABSTRAKPenelitian tentang laju tumbuh tanaman kentang dengan 2 (dua) varietas yaitu Granola dan Supejohn di dataran medium dengan menggunakan mulsa dilakukan di Desa Paslaten, Kecamatan Langowan Barat, Kabupaten Minahasa Provinsi Sulawesi Utara. Lokasi penelitian berada di dataran medium dengan elevasi 750 m di atas permukaan laut. Penelitian bertujuan untuk mendapatkan besarnya laju tumbuh umbi tanaman kentang yang dikembangkan di dataran medium dan jenis mulsa yang paling sesuai. Penelitian menggunakan rancangan acak kelompok dengan 2 (dua) faktor dan 3 (tiga) ulangan yaitu faktor I tanaman kentang (varietas Granola dan Supejohn) dan faktor II yaitu perlakuan mulsa (tanpa mulsa, mulsa jerami dan mulsa plastik hitam perak). Hasil penelitian menunjukkan bahwa perlakuan mulsa jerami meningkatkan laju tumbuh umbi pada varietas Granola sebesar 0.87 g tanaman-1 hari-1 dan varietas Supejohn sebesar 0.73 g tanaman-1 hari-1. Perlakuan mulsa plastik hitam perak meningkatkan laju tumbuh umbi pada varietas Granola sebesar 0.70 g tanaman-1 hari-1 dan varietas Supejohn 0.59 g tanaman-1 hari-1. Bobot kering umbi tertinggi dicapai oleh mulsa jerami. Perlakuan terbaik ialah varietas Granola yang diberi mulsa jerami. Laju pertumbuhan terendah terdapat pada perlakuan tanpa mulsa sebesar 0.49 g-1 hari-1 untuk kultivar Granola dan 0.47 g-1 hari-1 untuk Supejohn.Kata kunci: bobot kering, kentang, laju tumbuh, mulsa jerami, mulsa plastik hitam perak

Produktivitas Jagung (Zea mays L.) pada Berbagai Tingkat Naungan Tanaman Kelapa (Cocos nucifera L.) JOHANNES E.X. ROGI; J. I. KALANGI; JOHAN A. ROMBANG; A. LUMINGKEWAS; S. TUMBELAKA; YULIA PASKALINA
Buletin Palma No 38 (2010): Juni, 2010
Publisher : Pusat Penelitian dan Pengembangan Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/bp.v11n38.2010.49-59

Productivity of Corn (Zea mays L.) at Various Levels of Shading inCoconut Field (Cocos nucifera L.)Coconut cultivation in monoculture had problems in field production, processing and marketing that can cause low coconut farmers income. Therefore we need coconut farm diversification by increasing the potential of land among the coconut trees. Area of land that used coconut palm is only about 20% so that the remaining land that can be used for other commodities is 80%. One of the plants can be cultivated among the coconut is corn. Land use among the coconut palm is expected to increase corn production because corn is one of the leading food commodities and the potential in Indonesia. The objective of this study to determine the productivity of corn plants at different levels of shade by coconut palm. The research was conducted at the experimental Garden Kima Atas, Indonesia Coconut and Other Palm Research Institute (ICOPRI), North Sulawesi. This research was conducted from June to November 2007. The results showed that an increase in production of plant dry weight in treatment D (corn planted in open areas) is higher than treatment A (corn grown in between coconut palm old), B (corn grown inbetween coconut palm 20 years old) and C (corn grown in between coconut palm 50 years old).

The Use of SWAT Model to predict Erosion and Sediment in the catchment area of Lake Tondano Johan Rombang; Josephus Kalangi; Meity Rantung
Jurnal Ilmiah Sains Volume 22 Nomor 2, Oktober 2022
Publisher : Sam Ratulangi University

The Use of SWAT Model to Predict Erosion and Sediment in the Catchment Area of Lake Tondano. The objective of this research is to assess the accuracy of SWAT model to predict erosion and sediment in the catchment area of lake Tondano. A comprehensive hydrological model of SWAT is one of several models available to predict erosion dan sediment load. The validation of this model would be tested and it would be acceptable if Nash-Sutcliffe model Efficiency (NSE) coefficient was equal or greater than 0.4. The results in this experiment showed that values of NSE coefficient between sediment load observed and predicted by SWAT were between 0.4 and 0.9. Therefore, the use of SWAT model to predict erosion dan sediment in Tondano lake catchment area is satisfying and very good. Keywords: Catchment area; erosion; sedimentation; SWAT; NSE Penggunaan Model SWAT untuk Prediksi Erosi dan Sedimen di Area Tangkapan Air Danau Tondano Abstrak Penggunaan Model SWAT untuk Prediksi Erosi dan Sedimen di Area Tangkapan Air Danau Tondano. Penelitian ini bertujuan menguji keakuratan model SWAT dalam menduga erosi dan sedimen di area tangkapan air danau Tondano. SWAT (Soil Water Assesment Tool) merupakan model hidrologi yang komprehensif karena mempertimbangkan kondisi biofisik, iklim dan manajemen area tangkapan air dalam prediksi erosi dan sedimen. Penggunaan model SWAT untuk pendugaan erosi dan sedimen di area tangkapan air danau Tondano dapat diterima apabila hasil validasi sedimen terukur dan sedimen pendugaan menunjukkan koefisien NSE (Nash-Sutcliffe model Efficiency) lebih besar atau sama dengan 0,4. Penelitian ini menunjukkan bahwa model SWAT bisa digunakan untuk prediksi erosi dan sedimentasi di area tangkapan air danau Tondano karena koefisien NSE yang diperoleh pada 4 sungai yang bermuara di danau Tondano berkisar antara 0,4 sampai 0,9. Dengan demikian, pendugaan erosi dan sedimen di area tangkapan air danau Tondano dengan model SWAT dapat memberikan hasil yang memuaskan sampai sangat baik. Kata kunci: Area tangkapan air; erosi; sedimentasi; SWAT; NSE

PREDIKSI EROSI TANAH DI AREAL REHABILITASI DAERAH ALIRAN SUNGAI DESA BANTIK KABUPATEN BOLAANG MONGONDOW Fajar Gemilang Sahman; Joshephus I. Kalangi; Johan A. Rombang
EUGENIA Vol. 27 No. 1 (2021)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.27.1.2021.43259

Watersheds have some important roles for life in the vicinity, such as storing rainwater and flowing it as a water source. Disturbances in watersheds can causes soil erosion, which also causes the loss of fertile soil layers and carries solids and chemicals that can harm agricultural and human activities. Erosion prediction can be done by using the RUSLE method. The purpose of this study is to determine the rate of erosion in the rehabilitation area of the Bantikâ€™s watershed. The result of this study is to indicate that the erosion in the rehabilitation area of the Bantikâ€™s watershed is dominate by very light erosion with the lowest value around 1.04 tons/ha/yr and the highest value around 81.02 tons/ha/yr. It is necessary to take conservation measures on the soil and slopes so that erosion does not exceed its natural limits.

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