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All Journal Jurnal Hortikultura Indonesia (JHI) Agromet JURNAL PESISIR DAN LAUT TROPIS Jurnal MIPA EUGENIA Buletin Palma Jurnal Agroekoteknologi Terapan AGRI-SOSIOEKONOMI COCOS
Johannes E. X. Rogi
Universitas Sam Ratulangi
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Economics, Econometrics & Finance Environmental Science Mathematics Physics Social Sciences

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.99 KB) | DOI: 10.35791/agrsosek.v19i1.46751

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (124.321 KB) | DOI: 10.35791/agrsosek.v19i1.46854

Abstract

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

Abstract

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.
Variability of Oceanographic Parameters During and After Tropical Cyclone Kammuri in Talaud Islands Waters Khoirul Insan; Wilhelmina Patty; Indri S. Manembu; Rignolda Djamaluddin; Diane J. Kusen; James J. H. Paulus; Deiske A. Sumilat; Johannes E. X. Rogi
JURNAL PESISIR DAN LAUT TROPIS Vol. 13 No. 2 (2025): JURNAL PESISIR DAN LAUT TROPIS
Publisher : Sam Ratulangi University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35800/jplt.13.2.2025.62642

Abstract

Tropical cyclones are meteorological phenomena in tropical regions that can bring extreme weather, including heavy rain, thunderstorms, and strong winds along their path. These conditions can pose a threat to human safety, particularly fishermen and other maritime activities. The waters of the Talaud Islands, located near the western Pacific Ocean, are frequently traversed by tropical cyclones. This study aims to analyze the variability of oceanographic parameters spatially dan temporally during and after Tropical Cyclone Kammuri in the Talaud Islands waters. The oceanographic parameter data, including wind direction and speed, current direction and speed, sea surface temperature, and chlorophyll-a, are obtained from remote sensing data and numerical modeling, which can be accessed through the CMEMS website. Result of this study shows that During the cyclone, maximum wind speed reached 9.1 m/s, triggering an increase in surface currents up to 0.55 m/s. Sea surface temperature decreased by 0.6 °C due to vertical mixing, while chlorophyll-a concentrations dropped to 0.06 mg/m³ before rising again to 0.11 mg/m³. After the cyclone passed, wind and current speeds declined, while sea surface temperature and chlorophyll-a concentrations increased over the following three weeks. Keywords: Cyclone; Wind; SST; Chlorophyll-a; Talaud Abstrak Siklon tropis merupakan fenomena meteorologi di kawasan tropis yang dapat membawa cuaca ekstrem, termasuk hujan deras, badai petir, dan angin kencang di sepanjang jalurnya. Kondisi ini berpotensi membahayakan keselamatan manusia, terutama nelayan dan aktivitas pelayaran lainnya. Perairan Kepulauan Talaud terletak di dekat Samudera Pasifik Bagian Barat dimana pada wilayah tersebut sering menjadi jalur lintasan siklon tropis. Walaupun tidak termasuk lintasan siklon tropis, kondisi oseanografi di Perairan Kepulauan Talaud dapat menerima dampak tidak langsung dari fenomena tersebut. Penelitian ini bertujuan untuk menganalisis variabilitas parameter oseanografi secara spasial dan temporal pada saat dan setelah terjadinya Siklon Tropis Kammuri di perairan Kepulauan Talaud. Data parameter oseanografi berupa arah dan kecepatan angin, arah dan kecepatan arus, suhu permukaan laut, serta klorofil-a diambil dari data penginderaan jarak jauh dan pemodelan numerik yang dapat diakses melalui website CMEMS. Hasil penelitian menunjukaan bahwa pada saat siklon tropis kecepatan angin meningkat yaitu mencapai 9,1 m/s, memicu peningkatan kecepatan arus permukaan hingga 0,55 m/s. Suhu permukaan laut menurun 0,6 °C akibat pencampuran vertikal, sedangkan klorofil-a sempat turun menjadi 0,06 mg/m³ sebelum kembali naik ke 0,11 mg/m³. Setelah siklon berlalu, kecepatan angin dan arus menurun, sementara suhu laut dan klorofil-a meningkat dalam tiga minggu berikutnya. Kata kunci: Siklon; Angin; SPL; Klorofil-a; Talaud
PENDUGAAN POTENSI PRODUKSI GANDUM (Triticum aestivum L.) DI SULAWESI UTARA DENGAN MENGGUNAKAN PERANGKAT LUNAK SHIERARY WHEAT VERSI 2.0 Johannes E. X. Rogi; Siska J. Frans
EUGENIA Vol. 17 No. 1 (2011)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.17.1.2011.101

Abstract

The demand of wheat increases yearly in Indonesia. Therefore, Indonesia has imported wheat fromoverseas. Agronomically, wheat could be cultivated in Indonesia. Simulation model using ShieraryWheat ver 2.2 software developed by Handoko (1992) will be used in this studi. This software has beenvalidated by Rogi (1996) in several areas in Indonesia. This model has daily resolution which explainsinteraction between growth and development of wheat. Model inputs include weather elements such asradiation, temperature, humidity, wind and rainfall. Soil physical field capacity (water condition in thesoil), characteristic such as field capacity, wilt permanent point, and evaporation together with pH, totalnitrogen were incorporated in the model. Agronomical inputs such as irrigation, nitrogenous fertilizer,ground water and total nitrogen were used as hypothetical data. The research was aiming to assessthe best location and time for cultivated wheat ini North Sulawesi. The result showed that planted timein August had potential high yield followed by January, March, April, May, and Septemnber respectively.The suitable lacations for cultivated wheat in North Sulawesi were Tondano, Langowan, Tompaso,Tompaso Baru, and Kotamobagu. The best potential high yield was found in areas which had optimal ofair temperature and rainfall.Keywords : Wheat, Agronomically, Simulation model, Shierary Wheat Ver 2.0 ABSTRAKKebutuhan gandum yang terus meningkat setiap tahun di Indonesia dipenuhi dengan cara mengimpor,padahal secara agronomis gandum saat ini dapat dibudidayakan di daerah tropis dengan produksi yanglebih tinggi dan waktu panen yang lebih pendek. Penentuan daerah-daerah pengembangan Gandum diIndonesia seperti di Provinsi Sulawesi Utara penting untuk dilakukan dengan menggunakan modelsimulasi. Perangkat lunak Shierary Wheat Ver 2.0 yang dikembangkan Handoko tahun 1992 diMelbourne Australia dan divalidasi oleh Rogi (1996) dan telah dikalibrasi pada berbagai tempat diIndonesia. Model ini mempunyai resolusi harian yang menjelaskan proses interaksi antaraperkembangan dan pertumbuhan tanaman gandum. Input model terdiri dari unsur-unsur cuaca beruparadiasi matahari, suhu udara, kelembaban udara, kecepatan angin, dan curah hujan, sedangkan sifatfisik tanah (kapasitas lapang, titik layu permanen dan parameter evaporasi), serta sifat kimia tanah (pH,nitrogen total). Input agronomis berupa irigasi, pupuk nitrogen, kondisi awal berupa kadar air tanah dannitrogen total menggunakan data asumsi. Sehingga penelitian ini bertujuan untuk mendapatkan waktudan lokasi tanam yang terbaik untuk Tanam Gandum di Sulawesi Utara. Hasil penelitian mendapatkanbahwa Waktu tanam 1 Agustus mempunyai potensi hasil paling baik kemudian berturut-turut Januari,Maret, April, Mei dan September dengan lokasi yang sesuai adalah Tondano, Langowan, Tompaso,Tompaso Baru, dan Kotamobagu.
EFEKTIFITAS WAKTU PEMBERIAN DAN KONSENTRASI PACLOBUTRAZOL TERHADAP PERTUMBUHAN DAN HASIL KENTANG (Solanum tuberosum L.) VARIETAS SUPEJOHN Frangki Sambeka; Semuel D. Runtunuwu; Johannes E.X. Rogi
EUGENIA Vol. 18 No. 2 (2012)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.18.2.2012.3566

Abstract

ABSTRACT   The study aimed to examine the influence of time of application and concentration of paclobutrazol on growth and yield of potato crop Supejohn held in District Modoinding South Minahasa regency, from March to June 2012, using a randomized block design with two factors. The first factor is the concentration of Paclobutrazol with four standards are: 0 ppm, 75 ppm, 100 ppm, 125 ppm and the second factor is the provision of a three-level applications MST 4, 5 and 6 MST MST (Week After Planting). Based on research, the results of analysis of variance showed an interaction between application timing and concentration of paclobutrazol. Combination treatment with 125 ppm paclobutrazol 6 WAP application time can give significant effect on plant height, number of chlorophyll content, percentage weight class tuber yield components in the form of increased crop production amounted to 45.04 kg / plot (24 plants) / range 52. ton / ha by pressing the vegetative growth of plants. Key words : Supejohn, time application, concentration, paclobutrazol
PERTUMBUHAN DAN PRODUKSI DUA VARIETAS KENTANG (Solanum tuberosum L.) PADA DUA KETINGGIAN TEMPAT Benjamin H. Mailangkay; Jeanne M. Paulus; Johannes E.X. Rogi
EUGENIA Vol. 18 No. 2 (2012)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.18.2.2012.3954

Abstract

ABSTRACT   This study aimed to examine the growth and production of potato crop varieties and varieties Granola Supejhon on two altitude, which is 750 m above sea level and 1200 m above sea level, studies using randomized block design with two factors. The first factor is the Granola variety and Supejhon. The second factor is the altitude, which is 750 m above sea level and 1200 m asl. The results of this study indicate that the rate Crop Growth Rate (LTT) and the Tuber Growth Rate (LTU) of Supejhon Granola varieties have a much higher altitude 1200 m asl (Modoinding) compared with altitude 750 m asl (Langowan). The altitude effect on the number of tubers / plant and production / plot, otherwise varieties had no effect on the number of tubers / plant, weight of tubers / plot and production / plot, and there is no interaction between variety and altitude. At altitude 750 m asl, both varieties yield an average production of tubers / plot of 1343.20 g (1.34 kg), whereas the altitude of 1200 m asl generate 7462.18 g (7.46 kg). Based on the average, the weight of tubers / plant and production / plots at very low reached by the two varieties of Granola and Supejhon well, so that the two varieties are not recommended to be cultivated at altitude 750 m above sea level. Further research is needed to examine other potato varieties that can be cultivated in areas with altitude of 750 m asl. Keywords: Potato, growth, production, level altitudes ABSTRAK Penelitian ini bertujuan untuk mengkaji pertumbuhan dan produksi tanaman kentang varietas Granola dan varietas Supejhon pada dua ketinggian tempat, yaitu 750 m dpl dan 1200 m dpl, penelitian  menggunakan Rancangan Acak Kelompok dengan dua faktor.  Faktor pertama adalah varietas  Granola dan Supejhon.  Faktor kedua adalah ketinggian tempat, yaitu 750 m dpl dan 1200 m dpl. Hasil penelitian ini menunjukkan bahwa Laju Tumbuh Tanaman (LTT) rata-rata dan Laju Tumbuh Umbi (LTU) rata-rata varietas Granola dan Supejhon memiliki nilai yang jauh lebih tinggi pada ketinggian tempat 1200 m dpl (Modoinding) dibandingkan dengan ketinggian tempat 750 m dpl (Langowan).  Ketinggian tempat berpengaruh terhadap jumlah umbi/tanaman dan produksi/petak, sebaliknya varietas tidak berpengaruh terhadap jumlah umbi/tanaman, bobot umbi/petak dan produksi/petak, serta tidak terdapat interaksi antara varietas dan ketinggian tempat. Pada ketinggian tempat 750 m dpl, kedua varietas menghasilkan rata-rata produksi umbi/petak sebesar 1343,20 g (1,34 kg), sedangkan pada ketinggian tempat 1200 m dpl menghasilkan 7462,18 g (7,46 kg).  Berdasarkan nilai rata-rata, bobot umbi/tanaman dan produksi/petak yang sangat rendah dicapai oleh kedua varietas baik Granola maupun Supejhon, sehingga kedua varietas tersebut tidak dianjurkan untuk dibudidayakan pada ketinggian 750 m dpl.  Perlu dilakukan penelitian lanjutan untuk menguji varietas kentang lainya yang dapat dibudidayakan pada daerah dengan ketinggian tempat 750 m dpl. Kata kunci: Kentang, pertumbuhan, produksi, ketinggian tempat
ANALISIS DAMPAK PERUBAHAN IKLIM TERHADAP PRODUKSI BERAS PROVINSI SULAWESI UTARA TAHUN 2013 – 2030 Peter Rene Hosang; J. Tatuh; Johannes E.X. Rogi
EUGENIA Vol. 18 No. 3 (2012)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.18.3.2012.4101

Abstract

ABSTRACT   Climate change has caused in the decreasing of rice production worldwide which affects food security condition in North Sulawesi. Therefore, efforts need to be done to anticipate this issue. A combination of numerical and spatial models was chosen in this study. Paddy rice numerical simulation model described relationships between crops’ physical environmental conditions and physiological condition in the forms of mathematical equations. Model inputs included climatic components, such as: light, temperature, humidity, wind speed and rainfall; soil physical components including: soil capacity, permanent wilt point, soil evaporation parameter; soil chemical variables including: pH and total nitrogen; agronomical input including: crop varieties, seed growth rate, irigation and nitrogen fertilizer; initial conditions including: ground water concentration, mineral nitrogen (NH4 and NO3) from various soil layers. Model output can be determined based on the purpose of the study. This research concluded that (a) rainfall pattern change and temperature’s increase affected paddy rice production, (b) 141,677 ton of rice shortage will be occurred in 2030. Strategics to anticipate this condition should be formulated. It is recommended to conduct a further research on compiling climate change data in North Sulawesi. Also, it is crucial to produce best paddy rice varietas resistant of climate change through biotechnology. Keywords : climate change, produce   ABSTRAK   Perubahan iklim mengakibatkan terjadi gangguan dalam produksi tanaman padi yang mempengaruhi kondisi ketahanan pangan di Sulawesi Utara sehingga perlu adanya langkah-langkah mengantisipasinya. Metode penelitian dilakukan dengan menggunakan pendekatan yang mengintegrasikan model numerik dan spasial. Model numerik simulasi tanaman padi menjelaskan hubungan antara kondisi fisik lingkungan dengan kondisi fisiologis tanaman dalam bentuk persamaan-persamaan matematis.  Input model terdiri dari unsur-unsur cuaca berupa radiasi surya, suhu dan kelembaban udara, kecepatan angin dan curah hujan; sifat fisik tanah (kapasitas lapang, titik layu permanen dan parameter evaporasi tanah); sifat kimia tanah (pH, nitrogen total); input agronomis (varietas, laju penggunaan benih, irigasi, pemupukan nitrogen); serta kondisi awal berupa kadar air tanah dan nitrogen mineral (NH4 dan NO3) dari berbagai lapisan tanah.  Sedangkan untuk output dapat disesuai dengan tujuannya. Penelitian ini dapat disimpulkan bahwa (a) perubahan pola curah hujan dan kenaikan suhu udara mempengaruhi produksi tanaman padi, (b) prognosa ketersediaan beras pada tahun 2030 mengalami defisit sebesar 141,677 ton, sehingga diperlukan langkah strategi untuk mengantisipasi. Eugenia Volume 18 No. 3  Desember 2012 Kata kunci : perubahan iklim, produksi
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 Deiske A. Sumilat Diane J. Kusen Diane Tiwow Dianita Rogi Edy F. Lengkong Frangki Sambeka Franly J.I. Lamia Galensong, Justio P.D. Greydi F. H. Punusingon Handoko Handoko Hanny S. G. Kembuan Indri S. Manembu Indry E, Karundeng Inkiriwang, Annatje E.B. J. I. KALANGI J. Tatuh Jantje ., Pongoh Jeanne . Paulus Jeanne M. Paulus Jeanne Martje Paulus Jelie Viekson Porong JOHAN A. ROMBANG Kaeng, Silvana E. Khoirul Insan Kotangon, Antoneta Kartini Lamia, Franly J.I. Langimanapa S. Demmassabu Marjam Toding Marjam Toding, Marjam Master R.L. Sirait Meity R. Rantung Olivia Komansilan Paulus, James Pemmy Tumewu Peter Rene Hosang Pongoh, Jantje ., Rifaine M.N. Erungan Rifaine M.N. Erungan, Rifaine M.N. Rignolda Djamaluddin Rogi, Dianita Runtunuwu, Semuel 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 Tiwow, Diane Wakiah, Sitti Wenny Tilaar Wilhelmina Patty Yefta Pamandungan Yefta Pamandungan Yitenus Tabuni Yorri Y. J. Sanger YULIA PASKALINA Yunnita Rahim