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Published by Universitas Sumatera Utara
ISSN : 26557576     EISSN : 23564725     DOI : https://doi.org/10.32734/jpt.
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Tropical Agriculture Journal (JPT) is a peer-reviewed online journal of Agriculture Postgraduate Study Program Universitas Sumatera Utara (USU). Journal is a result of research, or scientific reviews of researchers, students and agricultural institutions, and others related to agricultural studies in the tropical region. Published in Indonesian and English language with 3 volumes/year (April, August, December). These articles are indexed by Google Scholar, PKP Indexing, RootIndexing, Portal Garuda, Indonesian Publication Index (Garuda Portal), One Search Perpustakaan Nasional, BASE (Bielefeld Academic Search Engine), and Directory of Research Journal Indexing (DRJI), JPT is member of AJPI (Association of Indonesian Agriculture Journal, and strives to be a means of periodic, accredited, national scientific publications or reputable international publications through.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 378 Documents
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Intensification of Kalimantan White Pepper (Piper nigrum) Oil Extraction Based on Microwaves and Ultrasonics Gotama, Bangkit; Addina, Khalisa; Ananda, Nur Afrie Rizqie
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (281.448 KB) | DOI: 10.32734/jopt.v9i2.8895

Abstract

White pepper is one of the staple spices of East Kalimantan. In order to boost the competitiveness of white pepper commodities, it is necessary to raise the added value of the commodity by transforming it into high-value goods, such as white pepper oil. This research intends to evaluate the production of local (LPL) white pepper oil (MLP) with commercial white pepper oil (LPK) using different extraction techniques (microwave-assisted hydro distillation, MAHD; and ultrasonic following hydro distillation, US-HD). This experiment also evaluated the effect of extraction factors on oil yield, including microwave power on MAHD, ultrasonic wave power on US-HD, sonication duration on US-HD, and solvent volume. A comparison of the energy usage of both approaches was also conducted in order to identify the most effective approach. The MAHD and US-HD techniques were used to extract 80 grams of dry white pepper powder mixed with aquadest for 90 and 180 minutes, respectively. Specifically for US-HD, the combination of raw materials was sonicated for 3-5 minutes prior to extraction utilizing the HD method. In both MAHD and US-HD, LPK includes more MLP than LPL, according to experimental findings. MLP yield may be increased by the addition of solvent, wave power (micro and ultrasonic), and sonication time. Based on its efficiency and energy consumption, the US-HD approach is superior to the MAHD.
Inventory of Pest and Disease in Mango Plants (Mangifera indica) Tanzil, Ahmad Ilham; Sucipto, Irwanto; Muhlison, Wildan
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.122 KB) | DOI: 10.32734/jopt.v9i2.8972

Abstract

Mango is a local fruit that is widely grown in Indonesia. Mango has several benefits for human life, including as a source of vitamins and industrial raw materials. This study aims to obtain pathogenic fungi that have the ability to cause disease in mango plants. This research was conducted in mango orchards in the provinces of South Sumatera, West Kalimantan, East Java, and Bali. Pathogenic fungi were observed from stems, leaves, and fruit. All symptoms of physiological and morphological deviations were observed to identify the cause. Then the identification procedure uses a supporting literature library. Pathogenic fungi were found, namely Xanthomonas citri pv. mangiferaeindicae, Ganoderma lucidum, Elsinoe mangiferae, Colletotrichum gloeosporioides, Ganoderma applantum, Paratetranychus yothersi, and Bemisia tabaci.
THE QUALITY OF COFFEE (Coffeasp) IN SOME DIFFERENT GEOGRAPHIC INDICATIONS : THE QUALITY OF COFFEE (Coffeasp) IN SOME DIFFERENT GEOGRAPHIC INDICATIONS Harahap, Amir Mahmud; Siregar, Elda Sari; Lubis, Rafiqa Amanda; Srikumala, Indah
Jurnal Online Pertanian Tropik Vol. 9 No. 1 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (299.043 KB) | DOI: 10.32734/jopt.v9i1.9009

Abstract

This study aims to determine the quality of coffee in several different geographical indications. This research was conducted at the Laboratory of the Faculty of Agriculture, University of Muhammadiyah South Tapanuli with a sampling method, namely sampling technique from 3 geographically indicated locations of coffee, namely Lintong Arabica Coffee, Mandailing Arabica Coffee and Sipirok Arabica Coffee. Observation parameters were altitude, water content, seed size and acidity (pH). Data analysis was carried out by analyzing the process hierarchy, correlation and concluded by descriptive method. Coffee quality is influenced by geographical indications, namely altitude. The highest water content is Mandailing Arabica Coffee and the lowest is Sipirok Arabica Coffee. The best bean size is Mandailing Arabica Coffee which has the highest size and the highest coffee acidity is Sipirok Arabica Coffee and the lowest is Lintong Arabica Coffee.
RESPONSE OF ORGANIC FERTILIZER OF BAMBOO BAMBOO AND VEGETABLE COMPOST ON VEGETATIVE GROWTH OF ROBUSTA COFFEE (CoffeaCanephora) Siregar, Elda Sari; Ritonga, Eka Nurwani; Mahmud, Amir; Harahap, Maya Desriyani
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (210.214 KB) | DOI: 10.32734/jopt.v9i2.9010

Abstract

This research program aims to determine the responsegiving organic fertilizer to the vegetative growth of robusta coffee plants (CoffeaCanephora). Using a 2 factorial Group Design (RAK), each treatment was given 3 replications. Factor 1 was liquid organic fertilizer for bamboo shoots (P0: control, P1: 200 ml + 1000 ml water, P2: 500 ml + 1000 ml water, and P3: 800 ml + 1000 ml water). Factor 2 is using vegetable compost (K0: control, K1: 10 grams/polybag, K2: 20 grams/polybag), K3: 30 grams/polybag). Parameters observed were plant height, number of leaves, stem diameter, and leaf width. Based on the data on the response variance of the application of liquid organic fertilizer (POC) for bamboo shoots, it was shown that there was no significant effect on the parameters of plant height, number of leaves, stem diameter, and leaf width at the ages of 2, 4, 6, 8, 10, 12 mst. The results of the response variance data for the application of vegetable compost showed no significant effect on the parameters of plant height, number of leaves, stem diameter, and leaf width at the ages of 2, 4, 6, 8, 10, 12 mst. And the results of the interaction of the two treatments showed no significant effect on the parameters of plant height, number of leaves, stem diameter, leaf width.
Effectiveness of Pest Control of Cocoa Fruit (Conopomorpha cramerella as) Using Pruning and Vegetable Insecticide Treatment on Cocoa (Theobroma cacao L) : Effectiveness of Pest Control of Cocoa Fruit (Conopomorpha cramerella as) Using Pruning and Vegetable Insecticide Treatment on Cocoa (Theobroma cacao L) Harahap, Samsinar; Siregar, Elda Sari; Mahmud, Amir
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (186.443 KB) | DOI: 10.32734/jopt.v9i2.9053

Abstract

The sustainability of cocoa production in Indonesia is faced with the problem of the cocoa pod borer (Theobroma cacao L.). In an effort to control the main pests on cocoa plants, various techniques can be used, namely control with the use of natural insecticides and control by technical culture in the form of pruning. Natural insecticide is an insecticide whose basic ingredients come from plants that are easilybiodegradablein nature, so they do not pollute the environment and are relatively safe for humans and livestock, because the residue is easily lost. Pruning is the act of removing part of the plant organs in the form of branches, twigs and leaves with the aim of obtaining good cocoa plant branches, regulating the distribution of production branches and leaves so that they are evenly distributed, removing unwanted plant parts, stimulating the plants to grow. form new organs, reduce the risk of pest and disease attacks, and increase the ability of plants to form fruit. The purpose of this study was to determine the response of the application of botanical insecticides and pruning to the control of the cocoa pod borer (Theobroma cacao L.). The experimental design used a non-factorial randomized block design consisting of 7 treatments. The treatment of vegetable insecticides consisted of 4 levels, namely I0 (Without insecticide = Control), I1 (vegetable insecticide made from srikaya seeds at a dose of 250 ml/liter of water), I2 (vegetable insecticide made from tuba root with a dose of 250 ml/liter water), I3 (vegetable insecticide made from tobacco leaves at a dose of 250 ml/liter of water). The pruning treatment consisted of 3 levels, namely I4 (Without Pruning (Control), I5 (Pruning Interval 7 days after the study) and I6 (Pruning Interval 14 days after the study). Observations consisted of attack intensity, level of damage caused by PBK attack, attack index and production Control of the cocoa pod borer by pruning and botanical insecticides on cocoa plants showed a significant effect on the parameters of attack intensity and level of damage at the age of 6 weeks, and the attack index at the age of 12 weeks. 2 msp, 4 msp, 8 msp, 10 msp, 12 msp, and the parameters of the level of damage at the age of 2 msp, 4 msp, 8 msp, 10 msp, 12 msp and the plant production parameters at the age of 12 msp showed no significant effect.
THE GERMINATION OF SALAK (Salacca zalacca) SEEDS WITH CHEMICAL SCARIFICATION TREATMENT : GERMINATION OF SALAK (Salacca zalacca) SEEDS WITH CHEMICAL SCARIFICATION TREATMENT Siregar, Elda Sari; Mahmud, Amir; Lubis, Rafiqah Amanda; Permadi, Muhammad Agung; Daulay, Ramadhan Syaputra
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.589 KB) | DOI: 10.32734/jopt.v8i1.9175

Abstract

This study aims to determine the effect of KNO3, H2SO4, and GA3 in breaking dormancy and germination of salak (Salacca zalacca) plants. In this study using a non-factorial randomized block design with one factor, namely P0 (control), P1 (KNO3 60%), P2 (KNO3 70%), P3 (KNO3 80%), P4 (H2SO4 60%), P5 (H2SO4 70%), P6 (H2SO4 80%), P7 (GA3 25 ppm), P8 (GA3 50 ppm), P9 (GA3 75 ppm), P10 (KNO3 60% and GA3 25 ppm), P11 (KNO3 70% and GA3 50 ppm), P12 (KNO3 80% and GA3 75 ppm), P13 (H2SO4 60% and GA3 25 ppm), P14 (H2SO4 70% and GA3 50 ppm), P15 (KNO3 60% and GA3 75). Parameters observed were germination, maximum growth potential, plant height, number of leaves, leaf length, and leaf width. Based on the results of the DMRT test at 5% level, it showed that each treatment had an effect on the chemical scarification treatment showing a significant effect on germination, maximum growth potential, plant height, number of leaves, leaf length, and leaf width. However, it did not have a significant effect on the number of leaves at 12 WAP, leaf width at 11 and 12 WAP. Keywords: Plant Height, Leaves, Leaf Width
Study of Palm Plant Productivity (Arenga pinnata merr.) Based on Differences in Companion Plants: Kajian Produktivitas Tanaman Aren ( Arenga pinnata merr. ) Berdasarkan Perbedaan Tanaman Pendamping Amir Mahmud; Darmadi Erwin Harahap; Elda Sari Siregar; Resti Lubis
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (183.838 KB) | DOI: 10.32734/jopt.v8i3.9176

Abstract

This research was conducted in Aek Nabara Village, Marancar District, South Tapanuli Regency. This study aims to determine the production of sap and palm sugar production based on differences in companion plants. Plant samples were taken from rubber companion plants, salak companion plants, cinnamon companion plants, durian companion plants, and cocoa companion plants. The highest sap production was found in sugar palm plants with durian companion plants, while the lowest sap production was found in sugar palm plants with rubber companion plants. The highest sugar production was found in palm plants with rubber companion plants, while the lowest sugar production was found in sugar palm plants with cinnamon companion plants.
CO2 MEASUREMENT IN PALM OIL PLANT IN PEATLAND Sebayang, Lukas; Marpaung, Imelda S
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (220.698 KB) | DOI: 10.32734/jopt.v9i2.9225

Abstract

Peatlands are one of the contributors to greenhouse gas emissions because it is estimated that the carbon stock stored in them is around 528 Giga tons (Gt) or equivalent to 75% of the total carbon (C) in the atmosphere, so that if peat is oxidized it will cause carbon to be released into the air. The conversion of forest land to agricultural land can be one of the causes, including the activity of making drainage channels. The construction of drainage channels causes a decrease in the water table so that the volume of peat under aerobic conditions increases while increasing the activity of microorganisms in decomposing peat. Peat decomposition and root respiration contribute to carbon emissions. This study aims to determine the CO2 concentration in several conditions of oil palm roots. CO2 measurement by survey method on oil palm plantations, using the IRGA (Infra Red Gas Analyzer). Measurements are carried out once per month from January to May 2020 for 3 minutes. The point of observation was determined by 2 factors with 3 treatments and 3 replications. Factor 1 is the observation point in the area of accumulation of midrib pieces and other litter (B1) and factor 2 is the observation point in the road area around the tree (B2). While the treatments were (A1) natural roots, (A2) roots were cut when the measurements were going to be taken and (A3) roots were cut and permanently restricted. The results of the measurement of the highest average concentration of CO2 changes from 0 minutes to 3 minutes in January were in treatment B1A3 (140.4 ppm), February in treatment B2A3 (103.9 ppm), March B1A3 (124.6 ppm) ppm), April B1A3 (143.8 ppm) and May B1A3 (110.7 ppm). Meanwhile, the lowest concentration of CO2 changes from 0 minutes to 3 minutes in January was in treatment B1A1 (71.5 ppm), February in treatment B1A1 (25.7 ppm), March B2A3 (40.2 ppm), and March B2A3 (40.2 ppm). April B2A1 (30.6 ppm) and May B1A1 (43.2 ppm). From the measurement results, it can be concluded that the highest concentration of CO2 and its changes was in treatment B1A3, namely in the treatment of cutting roots with permanent blocks, while the concentration of CO2 and its reduced changes was in the treatment of natural roots (A1) both in Blocks B1 and B2.
Use of Suweg (Amorphopallus campanulatus )Tuber Flour Substitute bread flour on the quality of sweet bread Ketaren, Bunga Raya; Rangkuti, Bella Triana; Ardilla, Desi; Novita, Aisar
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.196 KB) | DOI: 10.32734/jopt.v9i2.9423

Abstract

Healthy food is food that is rich in fiber, therefore this study was conducted to see the difference in the making of sweet bread by substituting wheat flour to Suweg tuber flour which is believed to be higher in fiber and better, besides that the treatment is to add CMC concentration in the manufacture of sweet bread. The Objective of this study was to obtain the best substitution effect of wheat flour and Suweg tuber flour in terms of nutritional value and quality of sweet bread and to determine the effect of CMC concentration in the manufacture of sweet bread. This study used a completely randomized design (CRD) method with two factorials. Factor I is the ratio of wheat flour and flour (T) consisting of 5 levels, namely T0 = 200: 0, T1 = 180: 20, T2 = 160: 30, T3 = 140: 60, T4 = 120: 80. Factor II is CMC concentration (C) consists of 3 levels, C1 = 0.37, C2 = 0.75, C3 = 1.12. Observational parameter tests carried out were color organoleptic tests, texture organoleptic tests, flavour organoleptic tests, taste organoleptic tests, expansion volume, water content, ash content, fat content, fiber content, and protein content. The results showed that the ratio of wheat flour and Suweg tuber flour had a very significant difference (p<0.01) on color organoleptic, flavour organoleptic, texture organoleptic, taste organoleptic, dough volume expansion, moisture content, content fat content, protein content and crude fiber content, while the concentration of CMC was very significant (p<0.01) on color organoleptic, texture organoleptic, dough volume expansion organoleptic, water content, protein content, fat content, and crude fiber content.
Waste Mixture Utilization as Oyster Mushroom (Pleurotus ostreatus) Growing Media Tjatur Prijo Rahardjo
Jurnal Online Pertanian Tropik Vol. 9 No. 3 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jopt.v9i3.9282

Abstract

Growth media composition needs to be considered because it can affect the growth and development of white oyster mushroom (Pleurotus ostreatus). Wood factory waste in the form of sawdust is commonly used as oyster mushroom’s growth media. However, problem arises when the source of growing media is difficult to access from the cultivation location. There’s a need for an alternative mushroom growing media that is cheap and accessible. Some of them are rice bran, soybean husk, and bagasse which are agricultural wastes. Therefore, this study aimed to obtain the best media composition for oyster mushroom’s growth and production. This study was compiled using one factor completely randomized design (CRD) namely, (M1) 1 kg of sengon sawdust and 1 ounce rice bran; (M2) 1 kg of sengon sawdust and 1 ounce soybean husk; (M3) 1 kg of sengon sawdust and 1 ounce bagasse; (M4) 1 kg of sengon sawdust, ounce rice bran and ounce soybean husk; (M5) 1 kg of sengon sawdust, ounce rice bran and ounce bagasse; and (M6) 1 kg of sengon sawdust, ounce rice bran, ounce soybean husk and ounce bagasse. Result showed that M2 and M4 media composition with soybean husk as one of the constituents was able to increase mushroom’s stem diameter, number of mushroom caps, and the fresh weight of the mushroom. More than ounces of rice bran and soybean husk was more optimal for supporting oyster mushroom growth than < ounces dosage.

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