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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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Growth Response of Soybean (Glycine max L Merrill) to NPK Fertilizer Dosage and Distance Planting in the Field Lisdayani; Putri Mustika Sari; Syahman margolang
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

In The effort to increase soybean production, various treatments can be applied, one of which is cultivation in which spacing between the plants is adjusted to obtain ideal production. Spacing is determined depending on seed growth, soil fertility, season, and the variety of plants. Apart from spacing, the use of compound fertilizer is also very important in the growth and production of soybean plants. One way to reduce production costs and improve the soil and crop yield quality is applying a compound fertilizer such as NPK Mutiara (16:16:16). NPK (16:16:16) fertilizer has a balanced composition of nutrients and dissolves slowly until the end of the growth process. The purpose of this study is to discover the effect of plant spacing and dosage of NPK Mutiara (16:16:16) fertilizer, and the best interaction between spacing and NPK Mutiara (16:16:16) fertilizer dosage, on the growth and yield of soybean plants (Glycine max (L) Merrill). The research was conducted in a farmerâ€™s experimental garden, in Jalan Eka Suka 11, Pangkalan Mansur Village, Medan Johor District, at a height of Â± 15 meters above sea level. The method used is a factorial randomized block design (RBD) with the first factor being plant spacing, and the second -factor being NPK fertilizer dosage. The results of the research show that NPK fertilizer dosage and plant spacing both have a significant effect on plant height and the number of branches. The highest plant height, 75.50 cm, was obtained using the treatment J3 (40 cm x 40 cm spacing), compared with the other two treatments. The lowest plant height, 61.08 cm, was obtained using the treatment J1 (30 cm x 30 cm spacing). The highest number of branches was seen in the treatment K3, with 7.00 stalks, while the lowest number of branches was found in the treatment K0, with 6.03 stalks.

Evaluation Of Land Suitability For Durian (Durio Zibethinus) Plants In Pangkatan District, Labuhanbatu Regency Novilda Elizabeth , Mustamu; Fitra Syawal, Harahap
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Durian (Durio zibethinus) is known as a plant that has a fairly high economic value which is widely planted on community land in Pangkatan District, Lauhanbatu Regency, North Sumatra Province. This study aims to evaluate the land suitability class for durian as an agroforestry plant in Pangkatan, Labuhanbatu Regency. Research activities include several stages of activities, namely: preparation, survey, soil analysis in the laboratory, data processing, and mapping. The survey method was carried out to collect soil samples in the field. Durian land suitability class was analyzed using the matching method. The method refers to the references and criteria adopted from the Soil Suitability of Agricultural Crops by the Center for Soil and Agroclimate Research, Bogor, Indonesia. The results showed that the actual land suitability class for durian plants in Sitellu Tali Urang Julu sub-district was marginally suitable (S3) on Land Units 1 and 6 and not suitable (N) on Land Units 2, 3, 4, and 5 with limiting factors. are temperature and soil texture. The results of the GIS analysis show that 52.5% of the total sub-district area is marginally suitable (S3) and 47.8% of the total sub-district area is not suitable (N).

Effect of Soaking Time with Gibberellins on Germination of Sugar Palm Plant Seeds Rosmaria , Girsang; Ariani Syahfitri , Harahap
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Sugar palm or palm tree (Sugar palm ga pinnata) is a tree that produces industrial materials, almost all parts or products of this plant can be utilized and have economic value. Gibberellin has the advantage of stimulating plant growth, accelerating and stimulating flowering, increasing seedbed yields, accelerating flower ripening, increasing production, accelerating seedling growth, breaking seed dormancy and producing seedless fruit. This study aims to determine the effect of soaking time with gibberellin on the germination of sugar palm plants. The research was conducted on Jl Wonogiri, West Medan District, Medan, starting from January to May 2018. The plant material used is palm plant seeds taken from a natural palm garden in Sipirok This experiment used a factorial randomized block design (RBD) with two treatments, namely immersion time (L0, L1, L2, and L3) and gibberellin (G0, G1, G2, and G3). Data were analyzed using analysis of variance (ANOVA). If the treatment (immersion time, gibberellin concentration and interaction) is significant, then proceed with DMRT (Duncan Multiple Range Test) at Î± = 5%. The observed parameters included: maximum growth potential, germination capacity and apocol length. The results showed that the long immersion treatment with gibberellin had no significant effect on all the parameters of the observation.

Growth of Morphology Seedling Papaya (Carica papaya L.) To Lengthy Variation Soaking Temperature and Receptacle Pre- Germination Assauwab, Muhammad Husaini
Jurnal Online Pertanian Tropik Vol. 8 No. 1 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Papaya is one of the leading tropical fruit that is very potential to be developed in Indonesia. Various treatments to solve dormancy of papaya seeds have been done, from sarcotesta disposal and administration, temperature treatment has shown varying results, so there is still no definite information about the way or treatment which is most appropriate for breaking the dormancy of papaya seeds. Therefore, the researchers wanted to do research on the Development of Morphology of Papaya Seedlings (Carica papaya L.) With Various Old Immersion Temperature and Pre-Germinary receptacle. Parameters seen are among others height of the plant and the length of the root. From this treatment, it is clear that the effect of the interaction of various immersion temperatures with pre-sprouted receptacle to Root Length Carica papaya L is significantly different.

Application of the flower of Beauveria bassiana Through immersion Seeds and It's effect on Colonization and content of Chlorophil leaves of red chilli (Capsicum annuum L.) Magdalena , Saragih; Trizelia; Nurbailis; Yusniwati
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Endophytic fungi in lately was getting a lot of attention in agriculture. Besides being able to increase plant resistance against plant pest organism, it has also the ability to stimulate germination and pant growth. One of endophytic fungi tested in its research was Beauveria bassiana from isolate Wheat, Coffeae, Cacao and entomopatogen fungus from Leptocorisa acuta insect. The aim of this research was to know the ability of Beauveria bassiana from some tested isolates and its effect on chlorophyll content of leaf chili followed Mack Kinner methode by doing seed treatment aplication. Colonization and chlorophyl content of chili leaf was done on 7 MPI. The research design used Random Block Design non factorial, data was analysis by 8 STAT. The result showed all of Beauveria bassiana isolates were able to colonize and established as endophytic in chili plant.Beauveria bassiana of wheat isolate was the best isolate giving spurring germination and seedling plant growth and not significant with B.bassiana isolate from Leptocorisa acuta insect. Aplication of B.bassiana isolates was able to increase the chlorophyll contentof chilileaf compared control. All of the tested B.bassiana fungus could increased chlorophyl-b content and chlorophyl totally of chili leaf, whereas chlorophyl-a content all of tested isolates was not significant. From its research showed there were corelation between colonization and leaf chlorophyll content, the higher percentage of endophytic fungus on leaf chili, it made higher the chlorophyl-b content and chlorophyl totally content of leaf chili.

Effect of several types of endophytic fungi isolates Beauveria bassiana in suppressing seed-borne pathogens Colletotrichumspp Dini Puspita , Yanty; Trizelia; Darnetty; Jumsu , Trisno
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Anthracnose is one of the most important seed-borne diseases in chili plants because this disease can reduce the quantity and quality of chilies and cause substantial economic losses. The aim of this study was to obtain the best isolates from various types of endophytic fungi Beauveria bassiana in suppressing the growth of pathogens. chili seed borne disease caused by the fungus Colletotrichum spp. The design used in this study was a completely randomized design (CRD) consisting of 6 treatments. The treatments consisted of control and 5 types of B. bassiana isolates (PD114, TD312, WS, BbKo, KT2B23). Parameters observed in this study were chili seeds that were attacked by Colletotrichum spp., normal seed germination on paper-to-paper test, length of plumule and radicle. Results. The study showed that different types of B. bassiana isolates could reduce the attack rate of seed-borne pathogenic fungi Colletotrichum spp. KT2B23 isolate was the best isolate in suppressing chili seed-borne pathogens.

Rice Ratoon Physiology: Effectiveness of Application N P K and Dolomite on Lowland Paddy Syahrullah, Syahrullah; Triasni, Aprilia; Tenri Sau
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The yield of ratoon rice technology has the potential to match the production of the main crop or the yield of the first crop. As a result of continuous chemical fertilization, the paddy soil becomes acidic. This study aims to obtain information on the effectiveness of neutralizing soil pH and fertilizing nutrients N, P, and K in increasing the yield of ratoon rice. The design used was a randomized block design with one factor, namely fertilization, there were 7 types of fertilization treatment for rice plants, namely N (p1), P (p2), K (p3), N + Neutral (p1 Neutral), P + Neutral (Rice Ratoon Physiology: Effectiveness of application N P K andÂ Dolomite On Lowland paddy Neutral), K + Neutral (p3 Neutral) and NPK + Neutral (P4). Observations were made on the growth and production characteristics of the main and ratoon plants as well as on ratoon roots. The results showed that the application of nutrients to the soil with a neutral pH had a significant effect on the growth and production of the main rice plants and ratoons. This study proves that neutralizing soil pH plays an important role in the effectiveness of fertilizing N, P, and K nutrients that are ready to be absorbed by ratoon rice plants.

Potato Cultivation Technology for Increasing Famers Income in Area Exposed to the Eruption of Mount Sinabung, Karo District Sebayang, Lukas; Mieke Afni Hardyani
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The negative impact of land exposed to the eruption of Mount Sinabung can be improved through the provision of soil amendments and improvement of soil fertility so that the physical and chemical properties of the land are suitable for potato plants. This study aims to compare the potato cultivation technology package recommended by the North Sumatra AIAT with the farmer technology package on land exposed to the eruption of Mount Sinabung. The experiment was conducted in one of the potato production centers that experienced the impact of the eruption in Kutarayat Village, Naman Teran District, Karo Regency, located 3 km from the eruption center from January - December 2019. The treatment of the cultivation technology package studied were: 1). Recommended technology package: Soil processed twice, dolomite 2 tons/ha, manure sown in arrays 20 tons/ha, sawdust 5 tons/ha, NPK 500 kg/ha, urea 100 kg/ha, KCl 100 kg/ha; 2). Farmer's technology package: soil is processed once, manure in holes 10 tons/ha, NPK 250 kg/ha, urea 100 kg/ha, KCl 100 kg/ha. The results of the study showed that: (1) the growth of potato plants that received the recommendation package cultivation technology treatment was better than the farmers' technology package. (2) potato tuber production with the application of recommended technology resulted in the highest tuber production of 39.81 t/ha, while the farmer's cultivation technology package was 23.79 t/ha. (3) Likewise, the weight of large tubers (> 200 g/tuber ) was significantly higher and more abundant than the farmers' technology package. Potato planting with the recommendation package input resulted in the highest tuber production of 39.81 t/ha. Economically profitable with a B/C ratio of 2.69. Key words: Potato, eruption, mount Sinabung, technology package

The Impact of Liquid Organic Fertilizer on Growth and Crop Production of Melon (Cucumis melo L.) Lisdayani; Candra, Ifan Aulia
Jurnal Online Pertanian Tropik Vol. 9 No. 1 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Melon (Cucumis melo L.) is one of the most popular fruit commodities in Indonesia, thanks to its sweet, wonderful flavor, as well as its high nutritional content and nutritional value. Consumer demand for melons is very high, both locally and internationally, although the sugar level of this particular melon is not too sweet. A melon (Cucumis melo L.) is a herbaceous annual plant that grows on vines and is a member of the cucumber family. This study aimed to determine the optimum concentration of cow urine for development (Cucumis melo L.). The experiment used a fully randomized design (CRD) with one factor, namely the concentration of 6-level bio urine, namely B0 = 0 percent bio urine, B1 = 10 percent bio urine, B2 = 20 percent bio urine, B3 = 30 percent bio urine, B4 = 40 percent bio urine, and B5: 50 percent bio urine from 100 ml/plant recommendation. The research findings indicated that application of bio-liquid organic fertilizer (POC) to cow urine may increase: plant length, stem diameter, number of male flowers, and number of female flowers with the best 10 percent POC bio-cow urine. Melon growing can produce 10 percent bio-liquid organic fertilizer (POC) from cow urine.

The analysis of decomposition rate of Vermigot fertilizer (vermicompost and kasgot) by utilizing of Black Soldier Fly larvae and earthworms with and without technique feeding Sebayang, Nur Ulina Warnisyah; Sabrina, Tengku; Rahmawati, Nini; Lubis, Nursiani
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

ABSTRACT One of the efforts in managing waste is to carry out environmentally friendly bioconversion with one of the most popular composting is vermicomposting. The use of insects in composting is also one of the new technologies, namely the Black Soldier Fly larvae. The combination of two types of decomposing organisms that are synergistic can increase the effectiveness of the decomposition process. The purpose of this study was to analyze the rate of decomposition of vermigot fertilizer in the treatment of cow manure and banana stem waste by utilizing a combination of BSF larvae and earthworms. This study used a non-factorial randomized block design method with 2 techniques (feeding and without feeding), namely D0 = without decomposers; D1 = earthworm (100%); D2 = BSF larvae (100%); D3 = earthworms: BSF larvae (50% : 50% kg); D4 = earthworms : BSF larvae (25% : 75%); D4 = earthworms: BSF larvae (75% : 25%). The results of this study showed that the pH of the vermigot ranged from neutral to slightly alkaline (6.4 - 7.8) in the non-feeding technique, while the pH of the vermigot in the feeding technique was slightly acidic (5.7 - 5.8). The temperature of the vermigot in the non-feeding and feeding technique is the same, ranging from (26 - 31oC) but in the non-feeding technique the temperature tends to rise until the 5th day and tends to decrease on the 7th day to the 21st day. Meanwhile, the temperature of the vermigot with the feeding technique tends to experience fluctuations.

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Home Page

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Editorial Team

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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