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JOHAN A. ROMBANG
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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.07 KB) | DOI: 10.29244/jhi.7.2.83-90

Abstract

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

Abstract

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 Issue 2, October 2022
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.789 KB) | DOI: 10.35799/jis.v22i2.43814

Abstract

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

Abstract

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 Bantik’s watershed. The result of this study is to indicate that the erosion in the rehabilitation area of the Bantik’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.
SKENARIO PEMANFAATAN LAHAN DI KECAMATAN MAPANGET BERDASARKAN ZONE AGROEKOLOGI DENGAN MENGGUNAKAN SISTEM INFORMASI GEOGRAFIS (SIG) Antoneta Kartini Kotangon; Johannes E. X. Rogi; Johan A. Rombang
AGRI-SOSIOEKONOMI Vol. 12 No. 2A (2016)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (864.358 KB) | DOI: 10.35791/agrsosek.12.2A.2016.13849

Abstract

This study aimed to develop land use scenarios in District Mapanget using Agroecology Zone-based Geographic Information System (GIS). The data used in this study are primary data and secondary data. Primary data were collected through surveys and direct observations in the field. The activities carried out field surveys to obtain state information field through taking pictures with a digital camera. Analysis of social data and data on potential farming is also done through the compilation of data to map the District Mapanget. Furthermore biophysical data agro-ecological, social and agricultural potential of the data compiled in a database system was using Quantum GIS program version 1.8. This study found that the use of agricultural land to non-agricultural land in the district Mapanget very difficult to avoid due to the low value of land from the agricultural sector compared to other sectors. So based on the evaluation conducted by comparing the map with a map of the existing condition of the District RTRW 2014-2034 Mapanget then it changes the function of which is no longer appropriate region where the agricultural area have been converted into non-agricultural. In order for this condition continues to be bad for the environment and agriculture will require efforts in the management and development in the District Mapanget, among others, the development of urban agriculture, every development in Sub Mapanget should always refer to the scenario Land use and Spatial plan of the District Mapanget that there are both carried out by the government, private or public. Urban agriculture has an important role for urban communities that suggested the need for land use scenarios in District Mapanget. Based on agroecological zone map and a map of the District RTRW 2014-2034 Mapanget then be collated Mapanget the District land use scenarios are divided by 3 (three) scenarios that city Scenario, Scenario frame the city, urban-rural scenario. The existence of land / space urban agriculture plays an important role in agricultural production systems and maintain the quality of the environment, because it is a major determinant spacious RTH (green open space) and the results of urban agriculture. In addition, urban farming provides employment and a source of additional revenue as well as environmentally sustainable society.
EVALUASI LAHAN UNTUK PENGEMBANGAN LAHAN PERKEBUNAN DI PULAU BACAN KABUPATEN HALMAHERA SELATAN Sitti Wakiah; Johan A. Rombang; Johannes E.X. Rogi
AGRI-SOSIOEKONOMI Vol. 12 No. 2A (2016)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (412.328 KB) | DOI: 10.35791/agrsosek.12.2A.2016.13850

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The research objective was to determine the suitability of land for a certain class of agricultural crops, namely, vanilla, oil palm, coconut, cocoa, nutmeg and cloves and to determine the direction of the crop land use. The study used survey method and analysis is to compare with criteria data suitability of land for plantation crops. Based on the results obtained twenty eight overlay land units and land units nineteen taken as a sample. The results show the suitability of land in Bacan Island of South Halmahera District for commodity crop plantations vanilla, oil palm, coconut, nutmeg and cloves in a class of land suitability is quite suitable (S2), cocoa belongs to a class of land suitability is marginally suitable (S3) with limiting factor the relative humidity. Economic analysis for all commodities is very suitable for development and Bacan Island of South Halmahera Regency.
PENGARUH TIPE TUTUPAN LAHAN TERHADAP IKLIM MIKRO DI KOTA BITUNG Yorri Y. J. Sanger; Rino ., Rogi; Johan A. Rombang
AGRI-SOSIOEKONOMI Vol. 12 No. 3A (2016)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (547.217 KB) | DOI: 10.35791/agrsosek.12.3A.2016.14355

Abstract

This study aimed to analyze the effect of land cover types to micro-climate of and analyze the effect microclimate to the trees and open land towards amenities environment for human. The City of Bitung has selected as a research site because it planned for mega projects. They are Special Economic Zones (KEK), International Relations Ports and Manado-Bitung Highways. The research used primary and secondary data. The parameters measured for each land cover includes the elements of microclimate namely: Air Temperature, Humidity and Solar Radiation. Data analysis using techniques T test, F test and Analysis of amenities based on the data of air temperature and humidity, it can be calculated by Temperature Humadity Index (THI). The measurement results microclimate taken at four different land cover that is at the city park, Central Business District (CBD), housing and industry. The results of this study prove the hypothesis that there are differences in the average value of the temperature and humidity in the trees, open land. Tree vegetation structures more effectively reduce the air temperature. The structure of the vegetation canopy of trees that have rounded and more densely branched patterns, height being between 6-10 m and serves to overshadow proved more effective in improving amenities in the surrounding area. Based on the value of THI, all land cover both parks, CBD, residential and industrial categorized uncomfortable because the average is at a value> 27. Housing area has very little green space. One of the efforts to improve the quality of the microclimate in order to enhance the user experience is to provide a good environment garden by planting vegetation predominant tree combined with shrubs and grasses to balance and harmonize between buildings and the environment also have aesthetic value. In the industrial area, the high levels of air pollution resulting from the production process so that recommended a good landscape arrangement, by expanding area of town forest and planting vegetation of trees that can absorb large numbers of pollutants result in healthy and fresh air for the region.
PEMANFAATAN LAHAN DI KECAMATAN RATAHAN, KECAMATAN RATAHAN TIMUR DAN KECAMATAN PASAN KABUPATEN MINAHASA TENGGARA BERDASARKAN ZONA AGROEKOLOGI DENGAN MENGGUNAKAN SISTEM INFORMASI GEOGRAFIS Astri Vandalia Elisabeth Naray; Johan Alexander Rombang; Jaelani ., Husain
AGRI-SOSIOEKONOMI Vol. 15 No. 2 (2019)
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.133 KB) | DOI: 10.35791/agrsosek.v15i2.24188

Abstract

This study aims to determine the direction of land use in Ratahan Subdistrict, Ratahan Timur and Pasan, Southeast Minahasa Regency, based on the Agroecology Zone using the application of Geographic Information Systems (GIS). The type of research used in this study is quantitative research with a method of data and spatial interpretation. The types of data used in the study are primary data and secondary data. The data generated is arranged in the form of information and spatial. The study was conducted in 3 (three) subdistricts namely Ratahan Subdistrict, Ratahan Timur Subdistrict and Pasan Subdistrict, Southeast Minahasa Regency, North Sulawesi Province, which were included in 1 (one) sub-district, Ratahan Sub-district. While the implementation time in April to June 2018. Analysis of the data used in this study where the resulting data is arranged in the form of data and spatial information, then compiling and analyzing data using the Quantum ArcGIS version 10.2 program application. Besides that, biophysical data analysis and agricultural potential data will be carried out. The results of the study based on the concept of land use in Ratahan Subdistrict, East Ratahan and Pasan results of agroecological zone maps using GIS obtained 32 zones from the results of analysis of soil type and slope data and climate type. The results of the analysis of the allocation in accordance with the conditions of land use (land cover) as well as the output of the map of Southeast Minahasa Regency RTRW space map in 2013, the agroecological zone can be divided into two main uses, namely protected zone and cultivation zone. In protected areas recommended in protected forests, water catchment areas, river borders and lake bordersaround the springs. Whereas in the cultivation area it is recommended to use land for agroforesty, rice fields, settlements, mixed farming, conservation settlements, plantations and production forest.*eprm*
PERANAN PENGGUNAAN LAHANDI AREA TANGKAPAN SUNGAI SUNGEAN TERHADAP EUTROFIKASI DANAU TONDANO Santi . Lumingkewas; Johan A. Rombang; Josephus I. Kalangi; Fabiola B. Saroinsong
COCOS Vol. 2 No. 1 (2013)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v2i1.731

Abstract

ABSTRACTEutrofication is one of the water pollution that caused by the increase ofthe consentrate of nutrient. This research studied conducted in catchment area ofSungean river sub DAS Noongan, Kab. Minahasa. The objective of this studywere to quantify the eutrofication’s rapid, in this case the value of Nitrogen andFosfor that caused by any land uses in catchment area of Sungean river sub DASNoongan.This research studied was done by taking the sample of water andquantifying water discharge in some point which had been chosen alongcatchment area of Sungean river that represent various land use. Then theconcentrate of N and P in water sample was analyzed in BARISTAND laboratory.Then the data of N and P That transported from each land uses, was analyzed instatistic with using Randomized Block Design (RBD) and spatial analisis(arcview).The result of research study showed that, each land uses gave effect tothe increase of lake eutrofication. Were in Tondano Lake from Sungean river forN was about 467,1076 mg/day and P was about 5,961849 mg/day. The biggestcontribution of N and P was from residential area, it was 464,2352 mg day-1 ha-1dan 5,961849 mg day-1 ha-1.Keywords : Eutrofikasi, Nutrient, River Of Sungean, Landuse
PEMBERIAN PUPUK DAUN TERHADAP PERTUMBUHAN BIBIT Gyrinops caudata (Gilg) Domke ( Granting Of Leaf Growth Fertilizer Seed Gyrinops caudata (Gilg) Domke ) Sumanto Basahona; Marthen T. Lasut; J. A. Rombang; Alfonsius Thomas
COCOS Vol. 2 No. 3 (2013)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/cocos.v2i3.1222

Abstract

ABSTRACTGyrinops caudata is one of gaharu plant family Thymeleaceae no less quality than the other speciesin Indonesia. Foliar fertilizers are inorganic fertilizers Gandasil D macro and micro, and a specialpowder for vegetative growth of plants. The purpose of this study was to determine the effect offoliar fertilizers on the growth of seedlings Gandasil D Gyrinops caudata by using completelyrandomized design (CRD) with 4 treatments and 5 replications. Treatment A concentration of 0 g / lof water, the treatment of B concentration of 2 g / l of water, (0.012 g dose), treatment Cconcentration of 4 g / l of water, (0.024 g dose) and treatment D concentration of 6 g / l of water,(dose 0.036 g). The variables measured were plant height increment, diameter increment in thenumber of stems and leaves. The results showed that the application of fertilizer to the seed leavesGandasil D Gyrinops caudata give significantly different results at high accretion, increased stemdiameter and in the number of leaves. Treatment D with a concentration of 6 g / l of water, (0.036 gdose) showed good results in plant growth compared with the other treatments.Key words : Gyrinops caudata, Agarwood, leaf manure Gandasil D
Co-Authors A. LUMINGKEWAS Abdul M. Muhammad Abdul M. Muhammad, Abdul M. Adenancy A. Montjai Adenancy A. Montjai, Adenancy A. Alfonsius Thomas Alfonsius Thomas Alfonsius Thomas Anggraini F. M. Pandeirot Anggreine H. Mentang Anggreine H. Mentang, Anggreine H. Antoneta Kartini Kotangon Astri Vandalia Elisabeth Naray Ayu Natia H. Djufri Belly Ireeuw Budi Utomo Mondolu Christomus Bode Christomus Bode, Christomus Claudio Bonifasius Etivera Safuf Etivera Safuf, Etivera Fabiola B. Saroinsong Fajar Gemilang Sahman Habdi Selpia Habdi Selpia, Habdi Hanny S. G. Kembuan Ikasapta Ramehiang J. I. KALANGI Jaelani ., Husain Johannes E. X. Rogi Josephus I. Kalangi Joshephus I. Kalangi KALANGI, J. I. Kalangi, Josephus Kotangon, Antoneta Kartini LUMINGKEWAS, A. Makarawung, Jerry Maria Y.M.A. Sumakud Marthen T. Lasut Marthen T. Lasut Marthen T. Lasut Marthen Th. Lasut Martina A. Langi Meity Rantung Mirna Umagapi Mirna Umagapi, Mirna muriany, vinolya Prisilia Nonong Krisnawati Loha Pangemanan, Euis F. S. PASKALINA, YULIA Prayitno Prayitno Ragentu, Deris Wijayanti Ramli Sapsuha Reynold P. Kainde Reynold P. Kainde Rinna Mamonto ROGI, JOHANNES E.X. Rogi, Rino ., S. TUMBELAKA Sanger, Yorri Y. J. Santi . Lumingkewas Sapan, Hagi Sitti Wakiah Sumanto Basahona Sumanto Basahona Timur Kogoya Timur Kogoya, Timur TUMBELAKA, S. Wakiah, Sitti Yorri Y. J. Sanger YULIA PASKALINA Yusran Ilyas, Yusran Zulfitri Lawe