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All Journal Jurnal Hortikultura Indonesia (JHI) Agromet Jurnal MIPA EUGENIA Buletin Palma Jurnal Agroekoteknologi Terapan AGRI-SOSIOEKONOMI COCOS

Johannes E. X. Rogi

Universitas Sam Ratulangi

Author-ID : 363126

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Economics, Econometrics & Finance Environmental Science Mathematics Physics Social Sciences

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PENDUGAAN DEFISIT DAN SURPLUS AIR UNTUK PENGEMBANGAN TANAMAN JAGUNG (ZEA MAYS L.) DI KABUPATEN GORONTALO DENGAN MENGGUNAKAN MODEL SIMULASI NERACA AIR Yunnita Rahim; Johannes E. X. Rogi; Samuel D. Runtunuwu
AGRI-SOSIOEKONOMI Vol. 11 No. 1 (2015)
Publisher : Sam Ratulangi University

This study aims to apply the water balance simulation model developed by Handoko (1992) for estimating the deficit and surp4lus water for the development of corn plants in the province of Gorontalo. This study was implemented from April to August 2014 in the District of Gorontalo. The study metods included field studies and modeling of water balance using a simulation model by Handoko (1992). The results showed that the period of water deficit was found in August and September where rainfall (Ch) is smaller than potential evapotranspiration (ETP) whereas periods of surplus water in the district of Gorontalo found in January to July and October to December where rainfall (Ch) exceeds potential evepotranspiration (ETP).

PENGARUH PEMANGKASAN DAUN BAGIAN BAWAH TERHADAP PRODUKSI JAGUNG MANIS (Zea mays var. saccharata Sturt) Augus Y. M. Sumajow; Johannes E. X. Rogi; Selvie . Tumbelaka
AGRI-SOSIOEKONOMI Vol. 12 No. 1A (2016)
Publisher : Sam Ratulangi University

The purpose of this study was to determine the effect of trimming the bottom leaves to the increased production of sweet corn crop. This research was arranged in a completely randomized design (CRD) with 4 treatments and repeated 5 times. Pruning is done at the age of 50 days after planting. The results obtained from this study are pruning significant effect on the rising corncob where the highest rates in the third pruning leaves the bottom (P3) weighing 333.04 g. In the variable length cob, cut 3 pieces (P3) gives the most high, 21.25 cm while trimming treatment 1 piece (P1) and a second piece (P2) shows the results are not significantly different from each other but significantly different from that of the untreated (P0) , While on the cob entire circumference of the variable level of treatment (P1, P2, P3) results are not significantly different from each other but all three significantly different from that of the untreated (P0) ddengan highest yield is in P3 which is 17.27 cm. from these results it can be concluded that treatment of the bottom leaf pruning can increase the production of sweet corn.

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

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

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

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.

NERACA AIR LAHAN UNTUK PENGEMBANGAN TANAMAN KELAPA SAWIT (Elaeis guinensis Jacq), DI KECAMATAN SANGKUB, KABUPATEN BOLAANG MONGONDOW UTARA Silvana E. Kaeng; Johannes E.X. Rogi; Jantje ., Pongoh
AGRI-SOSIOEKONOMI Vol. 13 No. 3A (2017)
Publisher : Sam Ratulangi University

This study aims to find out the water balance in Sangkub Sub-district, North Bolaang Mongondow Regency for oil palm cultivation with water balance simulation model developed by Handoko (1994) and Rogi (2002). The study was conducted from May - December 2016. This research uses simulation model method; the data used in this research is secondary data. The data analysis used run model of water balance of land and formula calculation of land water balance. The study found that the amount of water surplus from the run of the water balance model and calculations based on the formula in one year cannot meet the water requirements of oil palm crops, so that oil palm plantations cannot be cultivated in Sangkub Sub-district. This is due to the existence of rice cultivated crops prior to oil palm cultivation, where both plants require relatively large amount of water.

Pengukuran Ketajaman Ground Sampling Distance (GSD) Di Berbagai Ketinggian Lahan Sawah Dengan Menggunakan Drone Tipe Mavic 2 Pro Di Desa Matani Kecamatan Tumpaan Lamia, Franly J.I.; Rogi, Johannes E.X.; Tiwow, Diane
AGRI-SOSIOEKONOMI Vol. 19 No. 1 (2023): Agri-Sosioekonomi
Publisher : Sam Ratulangi University

Drones are a solution for getting data efficiently and effectively. The drone is also equipped with a flight control system through waves, ground positioning system (GPS) precision navigation, and flight control electronics so that it can fly according to the autopilot flight plan. The purpose of this study was to measure the sharpness of the Ground Sampling Distance (GSD) at various heights of paddy fields using the MAVIC 2 PRO TYPE Drone in Matani Village, Tumpaan District. The results of the research on measuring the acuity of the Ground Sampling Distance (GSD) in paddy fields using the MAVIC 2 PRO TYPE Drone in Matani Village, Tumpaan District show that flying altitude affects GSD results where the higher the drone altitude, the greater the GSD value and the lower the altitude. fly, the clearer the photos obtained. It is better to measure the sharpness of the Ground Sampling Distance (GSD) in the afternoon above 9 am because the sun's lighting affects the quality of the photo at a height of 200 meters so that the photo is clear.

Analisis Anomali Iklim Dalam Hubungan Dengan Produksi Padi Sawah (Oryza sativa L .) Di Kabupaten Minahasa Utara Rogi, Dianita; Rogi, Johannes E.X.; Runtunuwu, Semuel
AGRI-SOSIOEKONOMI Vol. 19 No. 1 (2023): Agri-Sosioekonomi
Publisher : Sam Ratulangi University

This study aims to look at the relationship between rainfall and lowland rice production in North Minahasa Regency from 2010 to 2020, and this research was carried out from August to October 2021. Data collection was taken using secondary data, and presented in the form of tables and graphs. The study used polynomial regression analysis using order 6 and Microsoft Excel 2016 software. The results showed that the rainfall in 2010-2020 in North Minahasa Regency fluctuated every year. The highest rainfall occurred in 2016, namely 5,322 mm and low rainfall occurred in 2015, namely 2,730 mm, the highest lowland rice production occurred in 2020, namely 8.32 tons/ha and the lowest rice production in 2010, namely 4.89 tons/ha. Based on the results of the analysis, it was found that R2 = 0.7218, which means that the correlation value is good and rainfall has a very good effect on the growth of paddy rice plants.

Pengaruh Jenis Dan Konsentrasi Auksin Terhadap Pertumbuhan Dan Perkembangan Tanaman Anggrek Dendrobium mirbelianum Secara In Vitro Galensong, Justio P.D.; Tilaar, Wenny; Rogi, Johannes E.X.; Lengkong, Edy F.; Walingkas, Stanley A.F.; Inkiriwang, Annatje E.B.
AGRI-SOSIOEKONOMI Vol. 20 No. 2 (2024): Agri-Sosioekonomi
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/agrsosek.v20i2.57367

This study aims to determine the effect of auxin type and concentration on the growth and development of orchid plants. The research was conducted at the Tissue Culture Biotechnology Laboratory, Faculty of Agriculture, Sam Ratulangi University Manado, and was carried out over 2 months from July to August 2023. This study used a factorial experiment in a Completely Randomized Design (CRD) with 5 replications consisting of two factors. The first factor is the type of auxin: IAA (A1), NAA (A2), and IBA (A3), and the second factor is the concentration of each auxin: 1 ml/l (K1), 2 ml/l (K2), and 3 ml/l (K3). The data were analyzed using analysis of variance, and if the results were significant, a 5% Least Significant Difference (LSD) test was conducted. The results showed that there was an interaction between the type and concentration of auxin on variables such as the number of roots, root length, root emergence time, number of leaves, number of shoots, and shoot height. Similarly, there was an effect of auxin concentration on each type of auxin, but there was a significant effect of individual auxin types (IAA, NAA, and IBA) on the root formation of Dendrobium mirbelianum orchids, affecting variables such as the number of roots, root length, root emergence time, number of leaves, number of shoots, and shoot height.

Co-Authors A. LUMINGKEWAS Aan A. Daradjat Antoneta Kartini Kotangon Augus Y. M. Sumajow Augus Y. M. Sumajow, Augus Y. M. Benjamin H. Mailangkay Bertje R. A. Sumayku Bonaventura R. Lienargo Budi Utomo Mondolu Charissa Maria Simbawa Chintya Gita Sartika Modeong Daniel Murdiyarso Daniel P. M. Ludong David P. Rumambi David S. Runtunuwu Diane Tiwow Dianita Rogi Edy F. Lengkong Farida Fattah, Farida Frangki Sambeka Frangky J. Paat Franly J.I. Lamia Gabai, Maria Galensong, Justio P.D. Greydi F. H. Punusingon Handoko Handoko Hanny S. G. Kembuan Indry E, Karundeng Inkiriwang, Annatje E.B. J. H. Palendeng J. H. Panelewen J. I. KALANGI J. Tatuh Jantje ., Pongoh Jeanne . Paulus Jeanne M. Paulus Jeanne Martje Paulus Jelie Viekson Porong JOHAN A. ROMBANG Josephus I. Kalangi Kaeng, Silvana E. Kotangon, Antoneta Kartini Lamia, Franly J.I. Langimanapa S. Demmassabu Malsupri Taher Mariam M. Toding, Mariam M. Marjam Toding Marjam Toding, Marjam Master R.L. Sirait Meity R. Rantung Olivia Komansilan Pemmy Tumewu Peter Rene Hosang Pongoh, Jantje ., Rifaine M.N. Erungan Rifaine M.N. Erungan, Rifaine M.N. Robert . Robert Robert Rogi, Dianita Runtunuwu D. S. Runtunuwu, Semuel S. D. Runtunuwu S. David Runtunuwu S. TUMBELAKA Sakti Karokaro Sakti Karokaro, Sakti Samuel D. Runtunuwu Selvie . Tumbelaka Selvie . Tumbelaka, Selvie . Selvie G. Tumbelaka Semuel D. Runtunuwu Semuel D. Runtunuwu Semuel Runtunuwu Silvana E. Kaeng Siska J. Frans Sitti Wakiah Sofia Wantasen Stanley A.F. Walingkas Sumayku, Bertje R.A. Tiwow, Diane Tulungen, Antje Grace W. Rotinsulu Wakiah, Sitti Wenny Tilaar Yefta Pamandungan Yefta Pamandungan Yitenus Tabuni Yorri Y. J. Sanger YULIA PASKALINA Yunnita Rahim

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