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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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Analysis of Soil Biological Conditions in Organic and Inorganic Agriculture Areas in Tanah Datar Regency Nasution, Ade Fitriadi; Adelina Harahap, Rasmita
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Enzyme activity due to soil microbial activity is an important event in knowing the status of microbial biomass and as an indicator of the occurrence of nutrient cycling. This activity is not just a chemical event, but rather a complex biological process related to the interaction of life interests between organism. The activities of each soil microbial group further emphasize its diversity status, and have an impact on various bioprocess events that allow the degradation and synthesis of soil organic matter. Respiration events are a description of the acceleration of bioprocesses carried out by soil microbial biomass. The implementation of an enzymatic process can reflect an integrated chemical process, physics and mineralization that occurs in the soil as a result of microbial activity, in maintaining and realizing the resilience of its ecosystem. This research is a survey method and soil sampling (purposive sampling) followed by soil testing in the laboratory with the following stages: (a) analysis of experimental soil samples at the Soil Biology Laboratory, Soil Research Institute, Bogor, (b) interview. Analysis of organic and organic soil nitrogenase activity in Jorong Carano Batirai and Jorong Aie Angek, Tanah Datar Regency obtained a total of 4 samples. Indicates the presence of nitrogenase activity, namely NOI, NAI, NOII and NAII. The highest nitrogenase activity based on ARA was in the NOII sample and the lowest was in the NAI sample. Land management affects urease activity, urease is an enzyme that is sensitive to various levels of land management. Higher urease activity with organic use, because the level of land management is less intensive and receives little inorganic fertilizer or pesticide. Keywords : soil enzyme activity, soil biological fertility

Analysis Of Water Requirements For Irrigation Of Green Honey Water Apple (Syzygium aqueum) In Pots Julia, Hilda; Novita, Aisar; Ketaren, Bunga Raya
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Plant irrigation water needs are important things to be met so that the plant growth is optimal starting from the vegetative phase to the generative phase. The current hot issue among potted fruit growers is the problem of dropping the ovary (pistil) on the plant. Many factors cause the fall of plant fruit, one of which is lack of water. This certainly needs special attention considering the nature of the water apple plant itself, in this study, especially the green honey water apple, it consumes quite a lot of water every day. To overcome the problem of water shortages in the green honey water apple plant, it is necessary to first know the average plant water requirement in pots through water content analysis in the laboratory at three stages of analysis and calculation of Pot Water Requirements (PWR) and Efficiency Needs Irrigation Water. Average Field Capacity Moisture Content of the potted planting media sample was 49.37%, Air Dry Moisture Content was 24.27 % and PWR 4.36 liters with an efficiency of irrigation water requirement for bulk systems (hand move or portable) of 5, 12-5.81 liters and a drip irrigation system (point source emitter) of 4.84-5.45 liters.

The Efforts To Increase Vegetative Growth of White Corn (Zea mays L) With Vesicle Arbuscular Mycorrhizae (VAM) and Distance Planting Treatment: Efforts To Increase Vegetative Growth of White Corn (Zea mays L) With Vesicle Arbuscular Mycorrhizae (VAM) and Distance Planting Treatment Silitonga, Yusnita Wahyuni; Erwin Harahap, Darmadi; Hamidi Hasibuan, Ilal; Hanafiah Nasution, Muhammad Nizar
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The purpose of this study was to see the effect of giving Vesicle Arbuscular Mycorrhizae (VAM) on the vegetative growth of white corn (Zea mays L), distance treatment of plant and interaction both of them on the vegetative growth of white corn. This study used a randomized block design (RBD) on factorial with two-factor and three replications. The first factor is the treatment of giving VAM (A) with various doses consisting of A1 (10 g/plot), A2 (20 g/plot) and A3 (30 g/plot), while the second factor is the treatment of plant spacing (J) with various sizes consisting of J1 (50 cm x 15 cm), J2 (50 cm x 25 cm) and J3 (50 cm x 35 cm). Data collection starts from planting to flowering, namely plant height, number of leaves, flowering time. Data analysis was carried out through analysis of variance and further test of DMRT at 95% confidence level. Based on the results of the study, it was found that the fungal treatment only had a significant effect on plant height and cob length, but did not significantly affect the number of leaves, flowering time. The plant spacing treatment only had a significant effect on plant height but had no significant effect on the number of leaves and flowering time. The interaction of the fungus treatment and plant spacing treatment showed that there was an interaction effect of the two treatments on plant height but did not significantly affect the number of leaves, flowering time. The treatment interaction A3J3 had the highest plant size of 114.55 cm.

Application Two Different Calcium on Sweet Corn Growth (Zea mays saccharata Strutt.) in Ultisol Marcel Clinton Sihotang; Rosita Sipayung; Charloq
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Sweet corn is a crop has a very good nutrient and tastes sweet and Calsium influenced contain. Ultisol is one of the soil that spreaded vastly in Indonesia, up to 25% of Indonesian total terrestrial area. Ultisol is an acidic soil, hence clacification can be applied to deal with it. The purpose of this research was to determine the growth response of sweet corn in two sources of calcium nutrients application to Ultisol soil. This research was conducted in the gauze of the Faculty of Agriculture, University of Sumatera Utara with an altitude of Â± 32 m above sea level starting from October 2017 to December 2017. This research used a Non Factorial Completely Randomized Design with 7 treatments and 4 repetition, the treatment of which was calcium nutrient, shell egg (9.22 g / 15 kg soil), eggshell (13.84 g / 15 kg soil), eggshell (18.45 g / 15 kg soil), dolomite 1 x Aldd (equivalent to 9.22 g / 15 kg of soil), dolomite 1.5 x Aldd (equivalent to 13.84 g / 15 kg of soil), dolomite 2 x Aldd (equivalent to 18.45 g / 15 kg of soil). The results showed that the two sources of calcium nutrients (eggshell or dolomite) applications had no significant effect on plant height, leaf number, stem diameter, canopy and root wet weight, and canopy and root dry weight.

Application of Natural Growth Regulator on Viability of Soursop Seeds (Annona Muricata Linn.). Ismail Marzuki; T. Irmansyah; Sitepu, Ferry
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Soursop (Annona Muricata Linn.) is a plant that has hard seeds that inhibits germination. One way that can be done to accelerate the process of germination of soursop is by scarifying and using natural growth regulators. This research aim was to identify the effect of scarification and immersion of natural growth regulators on the viability of soursop seeds. This research was conducted at the USU Faculty of Agriculture from July to September 2018 by using a Completely Randomized Design of two treatment factors namely, (1) Scarification (without scarification / control and scarification) and (2) Immersion of Natural Growth Regulators (No Immersion / Control, Immersion with young coconut water; red onion extract and young coconut water). The scarification treatment and immersion of young coconut water and/or red onion extract gave the highest yield, significantly on plant height, leaf number and vigor index.

The Mapping of Irrigated Paddy Fields which were Polluted by Detergent Waste in Kolam Village, Percut Sei Tuan Sub-district, Deli Serdang District Mulkan Syahputra; supriadi; Marpaung, Purba
Jurnal Online Pertanian Tropik Vol. 8 No. 2 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Rice is the staple food of the Indonesian people and in some places polluted by waste. This research aim was to provide a survey and map on the effects of detergent waste (phosphate available), electrical conductivity and soil pH in Kolam Village, Percut Sei Tuan Subdistrict of Deli Serdang District and analysis of sample points to P available, electrical conductivity and soil pH. This research started in September 2017 until January 2018. The method used was Grid Free and P available analysis used Bray II method, analysis of Electrical Conductivity with conductivity meter and analysis of soil pH with a pH meter. The results showed that the P available distribution consisted of very low (18%), low (52%) and moderate (30%). The distribution of soil electrical conductivity was low and the pH of the soil was acidic. Based on the analysis of sample points on P available, Electrical Conductivity and soil pH showed that the farther the distances from the irrigation pollutant channel, the availability of P decreased (0.088 ppm / meter) but did not affect the pH and electrical conductivity.

The Effect of Covering Media Composition and Fertilizer Cow Manage on The Growth of Palm Oil (Elaeis Guineensis J.) Seeds in Pre-Nursery Jamidi1; Irawan, Dicky; Purba, Mhd. Yudistira Pratama
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

The impact of using humus as a medium for planting oil palm seeds continuously canreduce the availability of humus in the field. Therefore, the use of subsoil as a plantingmedium and the use of cow manure are expected to increase the growth of oil palmseedlings. The purpose of the study was to determine the effect of the composition ofthe planting medium on the growth of oil palm seedlings. The research was conductedin Simalas Village, Serdang Bedagai, North Sumatra. The research method used was a 2factor randomized block design with 9 treatments and 3 replications. The results showedthat topsoil and subsoil planting media with a ratio of 1:1 had an effect on increasingplant height and leaf number of oil palm seedlings, while the application of cow manure25 g/polybag also had an effect on increasing the number of leaves of oil palmseedlings. There is a treatment interaction between the composition of the plantingmedium and cow manure on the number of leaves of oil palm seedlings.

Effect of Several Flowering Plants on Diversity and Populations of Pests and Natural Enemies in Cayenne Pepper (Capsicum frutescens)â€: Pengaruh Beberapa Tanaman Berbunga terhadap Keragaman dan Populasi Hama serta Musuh Alami pada Pertanaman Cabai Rawit (Capsicum Frutescens) Hidayah, Lailatul; Tri Haryadi, Nanang
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

ABSTRACT One of the causes of pest problems that dominate in cayenne pepper is the monoculture planting system. Monoculture cropping systems have a lower diversity of pests and natural enemies in the field compared to polycultures. imbalance in the ecosystem in a crop, causing insect pests to become more resistant and dominate. Utilizing flowering plants is one of the efforts to maintain the balance of the existing ecosystem in the cayenne pepper plantation. The purpose of this study was to determine the effect of flowering plant species on the population and diversity of pests and natural enemies of cayenne pepper, then find out what treatment is the most effective for reducing pest populations. This research was conducted from August to December 2021 on land located in Gebang Village, Southeastang District, Bondowoso. The research design used was a randomized block design (RAK) with several treatments including P0 (Control), P1 (Sesamum indicum), P2 (Sphagneticola trilobata), P3 (Turnera subulata) and P4 (Turnera ulmifolia). The observed variables were the population of pests and natural enemies, the diversity of pests and natural enemies. The results showed that several types of flowering plants had an influence on Arthropoda diversity in cayenne pepper plants with a moderate category, the population of pests and natural enemies showed significantly different results in several weeks. The most effective treatment that can reduce pests is P3 (Turnera subulata) treatment which can reduce the pest population of B. dorsalis and show the highest population of its natural enemy, Oxyopes.

Provision of Urea Fertilizer and Chicken Manure on Chemical Characteristics of Inceptisol Soil in Pangkatan District Muhammad Rizwan; FS, Harahap
Jurnal Online Pertanian Tropik Vol. 8 No. 3 (2021): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Inceptisol soil is an agricultural land in Indonesia, which is widely distributed, but has a problem, namely the element of N in the soil is relatively low, so it is necessary to carry out proper cultivation techniques, one of which is through the provision of balanced fertilizers, namely organic fertilizers which aim to improve soil fertility and reduce use of NPK fertilizer. This study aims to determine the effect of various kinds of organic fertilizers, namely sometimes goat and urea fertilizer on the chemical properties of Inceptisols from Pangkatan. This research was conducted in the Agrotechnology Practice Area, Faculty of Science and Technology, Labuhanbatu University, Rantau Prapat, with a height of 25 meters above the sea surface. The research was started from February 2021 to June 2021. This study used a factorial randomized block design (RBD) with 2 treatment factors. namely: Urea fertilizer factor with four levels and goat manure factor with three levels. Soil analysis parameters which include, pH H2O using the electrometric method, determination of N-total soil using the Kjehldal method, soil organic C using the Wakley and Black method. The results showed that the application of goat manure was able to increase soil N-toatal on Inceptisol Pangkatan, at a dose of U1K3 (Urea: 0.25g and goat manure: 75g) while the interaction of urea and goat manure application increased N-total soil of Rantau Inceptisol. South with a dose of U1K3 (Urea: 0.25g and goat manure: 75g).

EFFECT OF LENGTH EXPOSURE AND TYPES OF VOICE ON CORN SEEDS (Zea Mays) VIABILITY AND EARLY GROWTH Jasmi; Maja, Ibnu; Agustinur
Jurnal Online Pertanian Tropik Vol. 9 No. 2 (2022): JURNAL ONLINE PERTANIAN TROPIK
Publisher : Talenta Publisher

Seed quality includes three aspects, namely genetic quality, physical quality and physiological quality. Physiological quality is an aspect of seed quality as indicated by seed viability and vigor. This study aims to analyze the effect of different types of sound exposure on viability and early growth of corn seeds, and to analyze the effect of long exposure to sound on viability and early growth of maize seeds. The research was carried out in the laboratory of the Faculty of Agriculture, Teuku Umar University. on September 20 - October 19, 2019. This study used a Split Plot with the main plot type of sound exposure consisting of four levels, and the main sub-plot, namely the length of sound exposure consisting of three levels. Observed parameters; germination rate, growth speed, synchronous growth (KST), stomata openings. Based on the research results, the best germination rate, growth rate, growth impregnability, leaf width, and stomatal openings were found in the Murrotal Al-Quran exposure. In the long exposure to sound treatment, it showed that the length of exposure to sound had no significant effect on germination, growth speed, growth impregnability, leaf width of maize plants, and stomata opening of maize plants.

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Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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Abstract

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