Article Per Year (5 Year)
p-Index From 2021 - 2026
1.884
P-Index
This Author published in this journals
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

Published : 28 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 28 Documents
Search

 1   2   3 
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
PENGUJIAN DAN PENERAPAN MODEL SIMULASI PERTUMBUHAN DAN PERKEMBANGAN TANAMAN GANDUM (Triticum aestivum L.) BERDASARKAN INTERAKSI AIR DAN NITROGENVALIDATION AND APPLICATION OF THE GROWTH AND DEVELOPMENT SIMULATION MODEL OF WHEAT ... Johannes E. X. Rogi; I. Handoko; D. Murdiyarso; Aan A. Daradjat
Agromet Vol. 13 No. 1 (1998): JUNE 1998
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11956.217 KB) | DOI: 10.29244/j.agromet.13.1.25-40

Abstract

Abstract is available in the full text (pdf format)
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).
Pemberian Plant Growth Promoting Rhizobacteria (PGPR) Untuk Meningkatkan Produksi Padi Gogo Dan Jagung Dalam Sistem Tumpang Sari Olivia Komansilan; Jeanne Martje Paulus; Johannes E.X Rogi
Jurnal MIPA Vol. 12 No. 1 (2023)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jm.v12i1.43186

Abstract

Pemanfaatan PGPR pada sistem tanam tumpang sari padi gogo dan jagung diharapkan mampu membantu tanaman menyerap usnsur hara dengan lebih efisien sehingga upaya peningkatan produksi  tanaman  yang lebih  ramah lingkungan  dapat tercapai. Penelitian bertujuan mengkaji pengaruh pemberian PGPR bagi peningkatan produksi padi gogo dan jagung pada system tumpangsari serta mengetahui nilai kesetaraan lahan pada sistem tumpangsari padi gogo dan jagung setelah diberikan aplikasi PGPR dengan konsentrasi yang berbeda yaitu K1= 5 ml/liter, K2 = 10 ml/liter dan K3 = 15 ml/liter. Penelitian ini menggunakan Rancangan Acak Kelompok dengan 9 kombinasi perlakuan dan diulang sebanyak 3 kali sehingga didapatkan 27 petak percobaan. Bahan yang digunakan pada penelitian ini adalah benih padi gogo, jagung hibrida, dan PGPR. Alat yang digunakan mencakup cultivator, cangkul, sabit, meteran, jangka sorong, hand sprayer, tali dan alat pendukung lainnya. Hasil penelitian ini mendapatkan bahwa perlakuan PGPR dengan konsentrasi 5 ml/liter, 10 ml/liter, 15 ml/liter pada tanaman padi gogo hanya berpengaruh nyata pada jumlah anakan produktif pada sistem tumpangsari namun tidak berbeda nyata pada variable yang lain pada tanaman padi gogo maupun jagung. Hasil terbaik terlihat pada pemberian konsentrasi PGPR 15 ml/liter. Nilai kesetaraan lahan didapati bahwa pada perlakuan PGPR konsentrasi 5 ml/liter NKL : 1,26, konsentrasi 10 ml/liter NKL: 1,16, sedangkan konsentrasi 15 ml/liter NKL : 1,21.
RESPON EVAPOTRANSPIRASI TANAMAN PADI (Oryza Sativa L.) VARIETAS PERMATA DAN SERAYU TERHADAP VARIASI KETEBALAN TANAH MENGGUNAKAN METODE SYSTEM OF RICE INTENSIFICATION (SRI) DI DESA RASI, KABUPATEN MINAHASA TENGGARA Greydi F. H. Punusingon; Daniel P. M. Ludong; Johannes E. X. Rogi
EUGENIA Vol. 27 No. 1 (2021)
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35791/eug.27.1.2021.43258

Abstract

The purpose of this study was to calculate the amount of water required during the growth phases of the rice var. Permata and Serayu with soil layer thickness of 25 cm and 35 cm.This research was conducted in September - December 2019 in Rasi Village, Ratahan District, Southeast Minahasa Regency. The research was carried out experimentally and the observed data in the field were analyzed descriptively. This study consisted of two treatment factors, i.e. variety (Serayu and Permata) and the thickness of the cultivated soil (25 and 35 cm). The rice plants were planted in and in theiron boxes (60 X 60 cm) in the paddy fields. The total Evapotranspiration or water requirement for rice planted the iron boxeswere188 and 254 L, respectively, for soil depth of 25 and 35 cm in Serayu. For the Permata variety with a soil depth of 25 and 35 cm, the water requirement were175 and 231L, respectively.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (301.402 KB) | DOI: 10.35791/agrsosek.11.1.2015.7166

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (226.128 KB) | DOI: 10.35791/agrsosek.12.1A.2016.11537

Abstract

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

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

Abstract

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.
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