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PERTANIAN TROPIK

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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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Test of Some Varieties and Application Pesticides of Cloves Leaves to Eliminate Worm in Corn (Zea mays L). Nasution , Erti Kumala Indah; Harahap, Samsinar; Bisri, Ahmad; Nasution, Koirul Fadli
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The purpose of this research is to find out to determine the test of several varieties and the application of vegetable pesticides for clove leaves for Eradicating Leaf worms on Corn Plants (Zea mays L). From the results of statistical data analysis, the treatment of several varieties showed no significant effect on the parameters of plant height 3, 5, and 9 weeks after planting, Â diameter 3 and 5 weeks after planting, ear weight per sample, and ear weight per plot, but had no significant effect on the parameters. Plant height at 7 weeks after planting, stem dimensions 7 and 9 weeks after planting, and intensity of leaf caterpillar pests at 3, 5, 7, and 9 weeks after planting. From the results of statistical data analysis, clove leaf vegetable pesticide treatment showed a significant effect on the parameters of plant height at 5 weeks after planting, stem diameter 3, 5, 7, and 9 weeks after planting, but had no significant effect on plant height parameters aged 3, 7 and 9 weeks after planting, ear weight per sample, ear weight per plot and intensity of attack of leaf worm pests aged 3, 5, 7 and 9 weeks after planting. From the results of statistical data analysis, the interaction between the two treatments above shows an insignificant effect on all observed parameters.

Analysis of Sungai Ular Water Quality Viewed from The Impact of Palm Oil Industry Activities And PDAM Kurniawan, Zahir; Agustina, Nur Ariyani; Pratomo, Bayu
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

This research aims to determined the effect of industry wastes of Palm Oil and PDAM to the river water quality use parameters of the water caracteristic, parameters that using to determine the water Pollution level as ; Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Mangan (Mn), Aluminium (Al), Besi (Fe), Timbal (Pb), turbidity, and water quality standards of Sungai Ular. This research was carried out in Sungai Ular to Serdang Bedagai Regency and Deli Serdang Regency and next in The Laboratorium Socfindo Seed Production & Laboratories (SSPL) in September - October 2020. The research method is used a Purposive sampling. At all the stations of Sungai Ular stations that have determined in this research are result of parameters from BOD are into to the class II all of stations, and concentration of COD all of stations into to the class, and another parameters are still below the threshold to all of stations so can said from averaged of parameters all of stations, the Water quality of Sungai Ular are still classified below the threshold in accordance with government regulation number 82 of 2001. Keywords: Quality, River, Pollution, Industry.

Biologi Fall Armyworm (Spodoptera frugiperda J. E. Smith) (Lepidoptera: Noctuidae) di laboratorium Hutagalung, Rade Putra Satrio; Sitepu, Suzanna Fitriany; Marheni
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Spodoptera frugiperda J. E. Smith (Lepidoptera: Noctuidae) merupakan hama invasif baru yang menyebabkan kerusakan parah pada pertanaman jagung di beberapa daerah di Indonesia. S. frugiperda juga telah menyerang pertanaman jagung di Sumatera Utara berdasarkan data yang diperoleh dari Balai Perlindungan Tanaman Pangan dan Hortikultura (BPTPH) Sumatera Utara dan pengamatan di lapangan. Penelitian ini bertujuan untuk mempelajari beberapa aspek biologi Fall Armyworm (S. frugiperda) pada tanaman jagung. Penelitian ini dilaksanakan mulai bulan Januari 2020 sampai Maret 2020 di Laboratorium Hama Tanaman, Fakultas Pertanian, Universitas Sumatera Utara. Hasil penelitian menunjukkan bahwa siklus hidup S. frugiperda berkisar antara 38-45 (41,4Â±1,73) hari: telur menetas setelah 2 hari, larva instar pertama 2-3 (2,75Â±0,44) hari, larva instar kedua 3-4 (3,80Â±0,41) hari, larva instar ketiga 3-4 (3,80Â±0,41) hari, larva instar keempat 3-4 (3,70Â±0,47) hari, larva instar kelima 2-3 (2,70Â±0,47) hari, larva instar keenam 2-3 (2,30Â±0,47) hari dan pupa 8-10 (8,90Â±0,64) hari. Umur Imago betina 9-11 (10,20Â±0,92) hari sedangkan umur imago jantan 9-10 (9,20Â±0,42) hari. Imago betina selama hidupnya dapat menghasilkan telur 1063-1902 (1468,2Â±255,70) butir. Perbandingan nisbah kelamin S. frugiperda jantan : betina adalah 1 : 1,25. Kata kunci : biologi, jagung, Spodoptera frugiperda

In-vitro Evaluation of Fungicide Sensitivity of Tomato Leaf Blight Pathogens Ogolla, Fredrick; Nyakinywa, Ruth; Chabari , Samson; Onyango, Benson
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Tomato early and late blight diseases caused by Alternaria solani and Phytophthora infestans respectively, are constraints to tomato production globally. Conventional use of commercial synthetic fungicides in management of tomato blight disease has become a key input for tomato production among farmers in Tharaka Nithi County, Kenya. Indiscriminate use and application of sub-lethal doses of fungicides negate disease management efforts, and may lead to gradual fungicide resistance. Â Yet, local tomato farmers have continued to use the fungicides without periodic evaluation of their effectiveness. This study was carried out in-vitro to evaluate the efficacy of six synthetic commercial fungicides used by farmers around River Ruguti, against two tomato leaf blight pathogens; Alternaria solani and Phytophthora infestans. The poison food method was used to evaluate fungicides known by trade names and application levels; Â Mancozeb (640 g kg-1) + Metalaxyl (40 g kg-1), Mancozeb 640 g/kg + Metalaxyl 80 g/kg, Mancozeb, Propineb700 g/kg + Cymoxanil 60 g/kg, Carbendazim and Triticonazole at different concentration (25%, 50% and 75%). The in-vitro plate experiment was laid out in a Complete Randomized Design with 3 replicates, and data on mycelia growth inhibition analyzed through General Linear Model (Î±=.05) and significant means separated using Least significant difference (LSD) using Scientific Analysis System version 9.4. All the tested fungicides significantly (pâ‰¤ 0.05) inhibited mycelial growth of tested pathogen. Â Percentage inhibition for early blight pathogen (Alternaria solani) was 80.42% compared to late blight pathogen Phytophthora infestans at 69.51%. MancozebÂ Â (640 g kg-1) + Metalaxyl (40 g kg-1) and Propineb700 g/kg + Cymoxanil 60 g/kg recorded higher per cent inhibition of mycelia growth of 92.4% and 89.71% respectively. Carbendazim recorded lower per cent inhibition of 39.15%.Â Mycelia growth inhibition increased with an increase in fungicide concentration. Lower inhibition of 71.78% was observed at 25% concentration as compared to 50% and 75% with 76.77% and 76.36% respectively. Fungicides screened varied in mycelia inhibition against P. infestansÂ and A. solani isolates with MancozebÂ Â (640 g kg-1) + Metalaxyl (40 g kg-1) and Propineb700g/kg +Cymoxanil 60g/kg giving significantly (pâ‰¤ 0.05) better inhibition while Carbendazim had the lowest inhibition effect. Increased fungicide concentration effectively inhibited mycelia growth. Thus higher concentration of fungicide application is recommended in cases where there is low efficacy of fungicides.

In vitro The Role of Paclobutrazol in Potato Seed Production (Solanum tuberosum L) cultivar Granola Kembang Early Generation (G0) In Vitro: Potato Purba, Hans Samuel; Hot Setiado; Siregar, Luthfi A. M.
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The aim of the research was to determine the best paclobutrazol treatment to obtain superior quality seed potato cultivars. The research was conducted at the Tissue Culture Laboratory of Horticulture Technical Centre Service Unit, Gedung Johor, Medan, North Sumatra, Indonesia from January 2020 to March 2020. The complete randomized design with a single factor, 4 treatments, and 6 replications was used in this research. The results showed that the concentration of paclobutrazol affected the number of leaves, the shoots length, the number of shots, the number of nodes, the number of internodes, the stem diameter, and the percentage of roots formed but not significantly affected the number of roots. The M2 treatment, MS + 9 ppm paclobutrazol, showed the best treatment with an average plantlet performance value of 7.33 and the plantlets showed the compact morphology with larger stem diameter and smaller thick dark green leaves.

Recommendations for Increasing Sour Dry Sub-Optimal Land Potential for Several Food Crops Silvia Nora
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Sub-optimal land is land that has low productivity due to parent material, physical, chemical, biological properties of the soil, rainfall, and extreme temperatures. To meet the availability of national food sources, it is necessary to utilize sub-optimal land that is widespread in mainland Indonesia. The purpose of the study was to determine recommendations for increasing sub-optimal land potential based on land suitability classes for several food crops, namely lowland rice, upland rice, cassava, sweet potato, corn, soybean, and peanut. The research was conducted in Stabat District, Langkat Regency from June to November 2020, and the Asian Agri Laboratory of North Sumatera Province. The research method used is the survey method, while to determine the suitability of the land, namely the matching method. Land potential in Stabat District can be increased by managing it in the form of recommendations for adding N fertilizer was 7,000 kg N/ha or the equivalent of 1,555 kg urea/ ha, the addition of P fertilizer was 158.8 Kg P2O5 or equivalent to 441 Kg SP36/ha, K fertilizer was 26.32 Kg K2O/ha or the equivalent of 43.86 Kg KCl. The adding organic matter or compost is 43.8 kg C-organic/ha or equivalent to 63.9 kg compost/ha.

Introduction of indigenous Trichoderma spp. as an induced systemic resistance for Dieback disease control on the Nutmeg seedlings Susanna, Susanna; Hasnah Hasnah; Karina Shofiya Putri
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Dieback disease caused by L. theobromae has destroyed nutmeg plantations in Aceh Selatan. Until now, effective control has not been found, while farmer continue to use pesticides that have a negative impact on the environment. Therefore, biological control is an alternative to environmentally friendly control that is being promoted. The purpose of this researth was to control dieback by inducing resistance using three spesies of Trichoderma (local isolates) from the Nutmeg. The three isolates were isolates of plant origin and the nutmeg seeds used are one year old. This researth used a randomized blok design with three species of Trichoderma (T. virens, T. asperellum, and T. harzianum), three doses (5, 10, 15 g), and three replicates.The variables observed were the incubation period, disease incidence, length of stem discoloration, height of the plant, and plant wet weight. Thr result showed that all species of Trichoderma tested were able to induce systemic resistance and promoted plant growth, by inhibiting the incubation period, disease incidence, length of discoloration, increasing height and weight of plant. The treatment of T. virens 10 g was the best treatment result compared to the others.

Effect of Length and Up Ward Tapping on Physiology and Latex Yield on Rubber Plants RRIM 921 Purwaningrum, Yayuk; Asbur, Yenni; Kusbiantoro, Dedi; Khairunisyah
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

RRIM 921 is a slow starter clone where the metabolic rate is low to moderate which has specific characteristics such as responsiveness to stimulants, relatively more resistance to exploitation pressure and generally thick recovered skin so that it is potential to be exploited. The aim of the study was to determine the effect of the length and direction of the top tapping on the physiology and production of rubber plant clones RRIM 921. This research was conducted at PT. Perkebunan Nusantara III (Persero) Kebun Sei Putih, Afd I is located in Galang District, Deli Serdang Regency, North Sumatra Province with an altitude of 25 meters above sea level with Ultisol soil type. Using a non-factorial Randomized Block Design (RAK) with three replications, as the treatment of groove length and upward tapping direction (S) consisted of 3 levels, namely S/2U d3 ETG/27d; S/4U d3 ETG/27d and S/8U d3 ETG/27d. The results showed that the S/8 U d3 ETG/27d treatment had the highest sucrose content of 3.97 mM, the highest latex Pi level was found in the S/4U d3 ETG/27d treatment of 26.01 mM and the highest Thiol content was found in the S/8U d3 ETG/ treatment. 27d by 1.03 mM. The highest latex production was in January on the S/4U d3 ETG/27d treatment of 13.98 g/p/s and the lowest in April on the S/8U d3 ETG/27d treatment of 0.85 g/p/s.

The Effect of Cow Manure and Cow Dung Biochar Application on P Available and Growth of Corn Plants in Ultisol Lumbantobing, Romauli; Hidayat, Benny; Lubis, Alida
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Cow manure and cow dung biochar have great potential in increasing P available in Ultisol soil. The application of cow manure and cow dung biochar on P available and the growth of corn plants in Ultisol soil was done to compare the effect between the two treatments. This research used a non-factorial randomized block design with 7 treatments, namely: control, 3 levels of cow manure with a dose of 5, 10, and 15 tons/ha, and 3 levels of cow dung biochar with a dose of 5, 10, 15 tons/ha and 4 blocks. The parameters measured were H2O pH, P available, P total, Al-dd, C organic, plant height, canopy dry weight, and plant P uptake. The research results showed that the application of cow manure and cow dung biochar was able to increase H2O pH, P available, P total, C organic, plant height, canopy dry weight, plant P uptake, and was able to reduce the Al-dd in Ultisol soil. Cow dung biochar was better in increasing H2O pH, P available and P total of Ultisol compared to cow manure.

The Effect of Gibberelin in Salin Soil on Growth of Vetiver (Vetiveria zizanioides L.) Novita, Aisar; Rahmawati, Nini; Cemda, Abdul Rahman; Nora, Silvia; Harahap, Fitra Syawal
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Salinity is one of the problems in agricultural land in the world, including in Indonesia. Vetiver is quite tolerant of planting in saline soils at a certain level of salinity, but vetiver growth is inhibited at high salinity levels. The purpose of this study was to evaluate the effect of gibberellin in saline soils on the growth and production of vetiver (Vetiveria Zizanioides L.). This research was conducted in the greenhouse of the Faculty of Agriculture, Universitas Sumatra Utara, Medan. This study used a non-factorial completely randomized design, It was salinity stress (S) which consisted of 3 factors: Gibberellin concentrations of 0 (without treatment), 50 ppm, and 100 ppm. The results of this study indicate that giving Gibberellins in salinity stress conditions has a significant effect on the observed variables of plant height, specific leaf area, and cuticle thickness.

Page 28 of 38 | Total Record : 378

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Home Page

OAI Link

Editorial Team

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Contact Name Benny Hidayat

Contact Email bendayat@gmail.com

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Journal Mail Official jpt@gmail.com

Editorial Address 03, Prof. A. Sofyan Street Campus USU, Medan 20155- Indonesia

Location Kota medan, Sumatera utara INDONESIA

Abstract

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Contact Name
Benny Hidayat

Contact Email
bendayat@gmail.com

Phone
+6281396675484

Journal Mail Official
jpt@gmail.com

Editorial Address
03, Prof. A. Sofyan Street Campus USU, Medan 20155- Indonesia

Location
Kota medan,

Sumatera utara

INDONESIA