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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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Testing of Packaging and Use of Attractants to Control Fruit Flies(Bactrocera dorsalis Hendel) Guava (Psidium guajava L.) Siregar, Ameilia Zuliyanti; Zulina, Cynthia; Bakti, Darma
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The aims of this study to determine: The effect of kinds attractants and time of wrapping on to control of percentage of fruit fly attacks which determined the guava quality. This research was conducted in Durin Jangak Village, Pancur Batu District, Deli Serdang Regency from May to July 2019. This research was conducted using a randomized block design method with three factors: time, wrapping, attractant. The result of this research showed that the treatment by using the white plastic wrapping and attractant traps obtained the highest fruit diameter is 10.23 cm and the lowest treatment with no packaging and without attractant traps is 7.40 cm. In the treatment by using the white plastic wrapping and attractant traps obtained the highest fruit weight is 586 grams and the lowest treatment using without wrapping and attractant traps is 165 grams. At the observation of the highest trapped fruit flies in the treatment without wrapping and attractant traps that were 961 fruit flies and the lowest trapped fruit flies were white plastic wrapping treatments and attractant traps that were 790 fruit flies. In the treatment without wrapping and attractant traps,wrapping gauze and attractant traps obtained the highest percentage of fruit attack, namely 100% and treatment of white plastic wrapping and attractant traps obtained the lowest fruit attack, consist of 33%.

Productivity of Arenga Pinnata Merr Male Flower Stalks in South Tapanuli Regency Referring to Sustainable Agricultural Systems Parmanoan , Harahap; Mahyuni Khairiyah, Harahap; Sutan , Pulungan; Fitra Syawal, Harahap
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

This study aims to determine and complete the database related to the productivity level of male palm flower stalks in producing sap in wild populations of natural habitats in the South Tapanuli Regency. The research was conducted in 2 villages in 4 districts with a total sample of 40 palm plants. The stages in this research were carried out in three stages. The first stage is a survey sampling carried out by purposive sampling, namely the sampling technique to be used as a sample based on existing criteria, namely: 1. The shape of the stalk, 2. Color of a stalk, 3. Color of series, 4. Color of sap, 5. Length of stalk, 6 7. Stalk Diameter, and 7. Nira Production Data. The second stage is the data collection on the productivity of male palm flower stalks at all levels of the stem in producing sap. The third stage is a productivity data analysis. The results showed that the productivity of male flower stalks at each stalk level was in accordance with the amount of production and weight of sugar produced. Male flower stalk I have the highest amount of sap production and sugar weight followed by stalk levels II, III, IV, and V. Male flower stalk I have the best productivity of all levels of the male flower stalk, after that there is a decrease in the production of sap and sugar for productivity. Male flower stalks II, III, IV, and V. Productivity of the best male flower stalks produced an average sap production of 968.55 liters/stalk and an average sugar weight of 526.79 kg.

The Effect of Magnesium, Boron, and NPK Fertilizer on the Growth of Pre-Nursery Oil Palm (Elaeis guineensis Jacq) Sinaga, Daniel Perwiratama; Dwi Purbajanti, Endang; Adi Kristanto, Budi
Jurnal Online Pertanian Tropik Vol. 7 No. 2 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Oil palm is one of Indonesia's main commodity plantation crops that can produce vegetable oil and this plant is consumptive of nutrients. This research aims to examine the effect of magnesium, boron, and NPK compound fertilizers and the interaction between magnesium, boron, and NPK compound fertilizers on the growth of oil palm seedlings. The research was conducted in February - May 2020 in a greenhouse with an altitude of 250 meters above sea level and the Laboratory of Ecology and Plant Production, Faculty of Animal and Agricultural Science, Diponegoro University. The research was conducted using a completely randomized design with a 4 Ã— 4 factorial with 3 replications. The first factor is the provision of no fertilizer, magnesium fertilizer, boron fertilizer, and magnesium + boron fertilizers. The second factor is the NPK compound at a dose of 1.8, 2.8, 3.8, and 4.8 g/seedling. The results showed that magnesium + boron had a significant effect on the stem diameter and root length and the NPK compound at a dose of 3.8 g/seedling could increase the stem diameter, fresh and dry weight of the root. The interaction between magnesium + boron fertilizer and NPK compound fertilizer had no significant effect on the height of the seedlings, the number of leaves, stem diameter, length of the root, and fresh and dry weight of the root. Keywords: Oil palm seedling, growth, nutrients, fertilizer dose

Respons of Early Growth Vetiver (Vetiveria Zizanioides L.) Seedling on Salt Stress Condition Novita, Aisar
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Vetiver (Vetiveria zizanioides) is one of the essential oil-producing plants which is commonly called vetiver oil. Agricultural land in Indonesia has a salinity problem estimated at 0.44 million ha, the increase in salinity of agricultural land threatens the stability of agricultural production. This study aims to determine the respons of early growth vetiver (Vetiveria zizanioides L.) seedlings on salt stress condition. This research was conducted in a greenhouse, Faculty of Agriculture, University of North Sumatra, Medan. This study used a non-factorial randomized block design (RBD), namely the salinity (S) which consisted of 3 factors: the EC salinity levels were 0 (distilled water), 4 and 8 ds / m. The salinity stress treatment showed a significant effect of reducing the growth parameters of leaf dry weight, number of stomata and cuticle thickness but did not significantly affect the specific leaf area parameters at 8 WAP. The salinity stress treatment gave significantly better effect in conditions without salinity stress and partly showed better results in the salinity stress condition at the level of 8 dsm-1.

PRIMARY METABOLITE QUALITATIVE TEST OF BINTARO PLANT (CarberaodollamGaertn) AS A PEST BIOPESTICIDE Rattus argentiventer Susanti, Rini; Risnawati; Fadhillah, Wiznie
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Abstract Bintaro is a plant that contains poison in all parts of the plant. Cardiac glycoside compounds contained in Bintaro plants can be used as biopesticides to repel rats. Rat pests are one of the important pests in rice plants that are difficult to control, so rice production always decreases. Therefore it is necessary to look for an effective, efficient and environmentally friendly control technology, namely by using Bintaro plant extracts which are able to become biopesticides to repel rat pests. The purpose of this study was to determine the primary compound of the Bintaro plant (CarberaodollamGaertn) which acts as a repellent for thepest Ratusargiventer. The method used in this research is qualitative testing using phenol method to test the content of primary metabolites in the leaves and stems of Bintaro plants. From the results of the research conducted, it was found that the qualitative levels of primary metabolites from Bintaro leaves and stems contained protein content. Fat and carbohydrate content.

The Effect Of MSG (Monosodium Glutamate) And Origin Of Stem Cutting On Growth Moringa Olifera (Moringa) Plant Seeds Yususf, Mukhtar; Susanti, Rini
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Moringa olifera is known worldwide as a nutritious plant and WHO has introduced Moringa as an alternative food to overcome nutritional problems (malnutrition). Moringa plants are sought after because they can be processed into a variety of herbal medicines to raw materials for skincare products. "Moringa seeds and leaves are in a trend to be used for processed skincare products because of the nutrients they contain. This research was conducted from March 2020 until June 2020 in the village of Sei Karang, Stabat Subdistrict, Langkat Regency using a factorial randomized block design with 2 levels of treatment ie without MSG (P0), 2 g / 5 liters of water (P1), 5 g / 5 liters of water (P2), 7 g / 5 liters of water (P3), and stem cuttings (W1), middle cuttings (W2) and tip cuttings (W3). The results showed that the treatment of cuttings in the middle (W1) showed the highest with a value of 9.67 on the observation of the number of shoots, while the interaction of MSG and the origin of cuttings showed a significant effect on the emergence of the highest treatment shoots at P1W1 (2.5 g / 5 liters of water and stem section) with a value of 12.67 days and observation of root length in the P2W2 treatment (5 g / 5 liters of water and the middle section) with a value of 10.67

Evaluation Of Land Resource For Development Of Sorgum Plants In The Pantai Gemi Village District Stabat Risnawati; Mukhtar Yusuf; Rini Susanti
Jurnal Online Pertanian Tropik Vol. 7 No. 3 (2020): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The purpose of this study is to find the location of the land that is suitable or appropriate for sorghum plants seen at the level of the land suitability class are grouped in 5 classes of suitability, namely S1 (highly suitable), S2 (quite appropriate), S3 (marginal suitable), N1 (not appropriate at this time), and N2 (not as permanent). The results of the external scientific minimum in accredited national journals which have an ISSN, the results of the research done to get that to plant sorghum can be developed in fields of agricultural village beach gemi district stabat Kabupaten langkat with attention to some aspects of (1) the availability of excessive water can be done making drainage and (2) retention of nutrients; pH that is slightly sour can be improved by the administration of lime sedangkann low C organic can be corrected with the provision of organic matter can improve the nutrient content increased in the soil.

Robusta Coffee (Coffea robusta L.) seed germination response in various plant natural growth regulators with soaking duration Yeni Noviana; Meiriani; T. Irmansyah
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

One of causes coffee germination process takes a long period of time, because of the caffeine contained in coffee beans can inhibit the activity of amylase enzyme plays a role in the coffee germination process. Therefore, a study was conducted on the provision of Natural Growth Regulatory Substances (Natural PGR). This research was conducted at the Green House, Faculty of Agriculture, Univeritas Sumatera Utara, Medan from October 2019 to January 2020 using a Randomized Block Design (RBD) with two treatment factors : Factor 1 Natural PGR: A0 (water), A1 (bamboo shoot extract), A2 (shallot extract), and A3 (bamboo shoot extract + shallot extract). Factor 2 soaking duration : L1 (6 hours), L2 (12 hours), and L3 (18 hours). The results showed that the application of natural growth regulators (bamboo shoot extract or shallot extract) significantly increase the germination rate and seed vigor index. Soaking durationof 18 hours significantly increase presentation of germination but not different significantly from soaking for 12 hours, but there was no interaction between the two treatment factors. Keywords: Germination, Robusta coffee, natural PGR, soaking duration

The Effect of Rice Husk Ash and Goat Manure on the Growth of Spinach (Amaranthus gangetius) FS, Harahap; Hidayat, Benny
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

In the period of the last ten years increased market demand for spinach makes the outlook very promising so it is less optimal for the growth of spinach caused by the soil fertility is low so that the provision of organic material can improve soil fertility through the improvement of soil chemical to support the growth of red spinach. This study aims to determine the dosage of rice husk ash and dose of manure as well as the interaction of dosage that is optimal for the growth and yield of spinach. this research, land villa, Pasir mas which failed to compass with a height of 26 meters above sea level labuhanbatu district in August until December 2020.Research design using group factorial consisting of two factors. The first factor of rice husk ash (A) consists of 4 levels, namely : A0 = 0 ton/ha (control), A1 = 1 ton/ha equivalent to 50 g/m2 (the recommended dose), A2 = 1.5 tons/ha, equivalent to 75 g/m2. The second factor, namely the granting of goat manure (K) with three levels, namely : K0 = 0 ton/ha (control) K1 = 2 ton/ha, equivalent to 200 g/m2 (the recommended dose), K2 = 4 ton/ha, equivalent to 400 g/m2, K3 = 6 ton/ha, equivalent to 600 g/m2. The Parameters measured were plant height (cm), number of leaves (strands), Weight per Plant Sample (g). The results showed that the administration of goat manure 4 ton/ha, equivalent to 400 g/m2 can increase plant height, leaf number, and weight per plant of spinach while the provision of 1.5 ton/ha, equivalent to 75 g/m2 can increase plant height, number of leaves plant spinach

Application for Breaking Dormance and Giving Bokashi Salak Steel on the Growth of Salak (Salacca Sumatrana) Seeds Eka, Eka nurwani ritonga
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The purpose of this study was to determine the effect of breaking dormancy and giving bokashi bark leaves on the growth of salak ( Salacca Sumatrana ) seedlings. This study used a factorial randomized block design (RBD) with 3 blocks (replications). For the factor is the act of breaking dormancy and giving bokashi bark midrib. The statistical results showed that the treatment of dormancy breaking action had a significant effect, on the treatment of leaf area and plant height, the statistical results on the application of salak plant bokashi fertilizer did not show a significant effect on plant height and leaf area. Â

Page 27 of 38 | Total Record : 378

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Home Page

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Contact Name Benny Hidayat

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

Location Kota medan, Sumatera utara INDONESIA

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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