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Pebra Heriansyah
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Faculty of Agricultural Sciences, Islamic University of Kuantan Singingi Campus Kebun Nenas, Jake Jl. Gatot Subroto KM. 7. Kebun Nenas Jake, Kuantan Singingi, Riau Indonesia 29566
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INDONESIA
Jurnal Agronomi Tanaman Tropika (JUATIKA)
Published by Universitas Islam Kuantan Singingi
ISSN : 2684785X     EISSN : 26561727     DOI : https://doi.org/10.36378/juatika.v7i1
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Jurnal Agronomi Tanaman Tropika (JUATIKA) contains original articles of research, review article/literature review in Agronomy, Plant Protection, and Soil Science
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Agronomi dan Ilmu Tanaman
Articles 358 Documents
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The Relationship Between Soil Conservation Techniques, Topsoil Depth, and Density of Vegetation Growing and Soil Organic C Content in Palm Oil (Elaeis guineensis Jacq) Plant Areas at Plantation IV Regional II Pabatu North Sumatra Province, Indonesia Akhiruddin Tanjung; Saroha Manurung; Aulia Juanda Djaingsastro
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 2 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 2 Mei 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i2.5519

Abstract

Oil palm (Elaeis guineensis Jacq.) is a strategic plantation commodity that plays an important role in the Indonesian economy, contributing significantly to vegetable oil production and foreign exchange earnings. This study aims to identify soil conservation techniques and analyze the relationships among topsoil depth, weed vegetation density, and soil organic carbon content in coconut oil palm plantations at PT Perkebunan Nusantara IV Regional II Pabatu, North Sumatra Province. The research was conducted from April to May 2026 using a descriptive method with a field survey approach. Samples were collected through purposive sampling based on different soil conservation techniques applied in each observation plot. Data were gathered through field observations, measurements of topsoil depth, weed vegetation assessments, and laboratory analysis of soil organic carbon content. Vegetation analysis employed parameters such as density, frequency, Importance Value Index (IVI), and Summed Dominance Ratio (SDR). The study identified five weed species classified as broadleaf, grassy, and nutsedge weeds, with Ageratum conyzoides being the dominant species based on the highest IVI value. Topsoil depth ranged from 23 to 35 cm, averaging 28 cm, while soil organic carbon content varied between 1.08% and 3.07%. The significance of this study lies in its integrated examination of soil conservation aspects, vegetation, and soil chemical properties in coconut oil palm plantations. The findings can serve as a foundation for sustainable land management practices to maintain soil fertility and reduce erosion risks in coconut oil palm plantations.
Interaction of Humic Acid and NPK 16:16:16 in Nature on Increased Shallot Production (Allium cepa L. var. aggregatum) Tri Yuliaman Telaumbanua; Hamidah Hanum; Mariati
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 2 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 2 Mei 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i2.5631

Abstract

Shallot productivity is frequently constrained by low nutrient use efficiency and declining soil quality caused by continuous application of inorganic fertilizers. This study aimed to evaluate the effects of humic acid and NPK 16:16:16 fertilizer, as well as their interaction, on the growth and yield of shallot (Allium ascalonicum L.). The experiment was arranged in a factorial Randomized Block Design with two treatment factors and three replications. The first factor was humic acid dosage consisting of 0, 1.5, 3, and 4.5 g plant ⁻ ¹, while the second factor was NPK 16:16:16 dosage consisting of 0, 15, 30, and 45 g plant ⁻ ¹. The results revealed that both humic acid and NPK 16:16:16 significantly affected several physiological and yield parameters of shallot plants. Significant interactions were observed on plant height at 3 weeks after planting, leaf nitrogen uptake, leaf area index, and fresh bulb weight. The combination of 45 g plant ⁻ ¹ NPK and 4.5 g plant ⁻ ¹ humic acid produced the highest fresh bulb weight of 74.76 g plant ⁻ ¹. Humic acid application enhanced nutrient uptake efficiency, improved soil nutrient availability, and stimulated plant physiological activity, while NPK fertilizer supplied essential macronutrients required for optimal bulb development. The novelty of this study lies in demonstrating the synergistic interaction between humic acid and NPK 16:16:16 in improving shallot productivity under low-organic-matter soil conditions. Therefore, the combined application of 45 g plant ⁻ ¹ NPK 16:16:16 and 4.5 g plant ⁻ ¹ humic acid is recommended as an effective and sustainable fertilization strategy for shallot cultivation.
Morphological Characterization of Coelogyne asperata Lindl. in Kuantan Singingi Regency, Riau Province, Indonesia Pebra Heriansyah; Elfi Indrawis; Tri Nopsagiarti; Gusti Marlina; Seprido; Puti Annisa Ilhasana; Khairina Fadillah Syaputri
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 3 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 3 September 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i3.5195

Abstract

Coelogyne asperata Lindl. is a tropical orchid with distinctive vegetative and reproductive characteristics and considerable potential for ornamental cultivation and conservation. However, detailed morphological information on this species remains limited, particularly for populations in Riau Province, Indonesia. This study aimed to characterize the morphological traits of C. asperata based on quantitative characteristics of vegetative and reproductive organs. The study was conducted in Kuantan Singingi Regency, Riau Province, Indonesia, using a descriptive observational approach. Six healthy and mature individuals were selected through purposive sampling, with three measurement replicates. Morphological observations included roots, pseudobulbs, leaves, inflorescences, and flowers, following standard orchid taxonomic descriptors. The results showed that C. asperata exhibited relatively large vegetative structures, with mean leaf length and width of 55.00 ± 2.00 and 13.00 ± 1.50 cm, respectively. Mean pseudobulb length and width were 14.00 ± 1.30 and 7.00 ± 0.50 cm, respectively. The root system comprised 31.00 ± 2.00 primary roots with a mean length of 25.00 ± 2.00 cm and 24.00 ± 2.00 secondary roots with a mean length of 9.00 ± 1.10 cm. The inflorescences produced an average of 10.00 ± 1.00 flowers per stalk. Overall, the observed morphological characteristics were consistent with the established descriptions of C. asperata and indicated well-developed vegetative and reproductive structures. These findings provide baseline morphological data supporting species identification, documentation, conservation, and future research on the cultivation and utilization of C. asperata.
Earthworm (Lumbricus) Feeding on Rubellus and Cabbage Waste on Purple Eggplant (Solanum melongena L.) Gusmawartati; Joehari Jamili; Agridifa Anugerah Had
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 3 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 3 September 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i3.5470

Abstract

Eggplant (Solanum melongena L.) is a widely consumed vegetable in Indonesia, both as a fresh salad and in various prepared dishes. This vegetable is rich in nutrients, particularly vitamin A and phosphorus, and can help improve the nutritional diversity of the population. In Riau Province, average eggplant productivity has declined, necessitating improvements to the production system to meet steadily rising demand. This study aims to investigate the interaction between earthworm application and cabbage residue and to identify the combination that produces the best eggplant plants. The experiment used a factorial Completely Randomized Design (CRD) with two factors. The first factor was earthworm application (0, 20, and 30 earthworms per polybag). The second factor was cabbage residue application (0, 420 g, and 630 g per polybag). The observed parameters included plant height, days to flowering, days to first harvest, fruit length, fruit diameter, and fruit weight. The data were statistically analyzed using analysis of variance (ANOVA); if the calculated F-value exceeded the table F-value, the analysis continued with Duncan's New Multiple Range Test (DNMRT) at the 5% significance level. The results showed that there was no significant interaction between the two factors for any of the observed parameters. However, individually, the application of 30 earthworms and 630 g of cabbage waste tended to produce the best growth and yield. Based on the research results, it is recommended to use a combination of 30 earthworms and 630 g of cabbage waste.
Analysis of N, P, K Content in Soil Planted with Edamame Beans (Glycine max (L.) Merr.) As an Intercrop on Land Where Oil Palm Plants Have Not Yet Produced Raisya Nazwa Auliandri; Dina Arfianti Saragih
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 3 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 3 September 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i3.5706

Abstract

Edamame beans (Glycine max (L.) Merrill) are legumes with potential as intercrops because they can help improve soil fertility through their effects on nitrogen (N), phosphorus (P), and potassium (K) content. This study aims to determine the changes in soil nutrient content—specifically nitrogen, phosphorus, and potassium—before and after planting edamame beans as intercrops on oil palm immature plants (TBM). The research was conducted on smallholder oil palm TBM land in Bukit Lawang Bahorok, Langkat Regency, from May 2025 to May 2026, using descriptive statistical methods. Edamame was planted on five beds measuring 1 m × 10 m, with 1,500 seeds of the Japanese variety Ryoko 75. During the study, no fertilizer or mulch was applied, but weeding was carried out periodically to maintain plant growth. Laboratory analysis of soil samples assessed the nutrient content of N, P, and K before and after planting. The results showed that nitrogen content decreased from 0.07% to 0.06%, while phosphorus content decreased from 19.78 ppm to 11.87 ppm. These decreases likely occurred because plants absorbed high levels of nutrients during vegetative and generative growth. Meanwhile, potassium content increased from 0.06 me/100 g to 0.15 me/100 g. The primary advantage of this system is its high productivity, yielding 3,068 kg of edamame without any fertilizer or mulch application, demonstrating excellent cost-efficiency. Based on these findings, it can be concluded that planting edamame beans as an intercrop on oil palm TBM land affects soil nutrient dynamics—particularly by increasing potassium content—though it did not significantly increase nitrogen and phosphorus levels during the study period. Therefore, it is highly recommended that farmers adopt this intercropping system to optimize land use and generate early income during the oil palm immature phase. However, a low-dose supplementary application of N and P fertilizers is advised to prevent soil nutrient depletion.
Population Census of Fire Caterpillars (Setora Nitens Walker) in Oil Palm Plantations (Elaeis Guineensis Jacq.) in the Begerpang Plantation of PT PP London Sumatera Indonesia TBK Nurmala Aqsa; Ahmad Saleh; Makharani Sari Ginting
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 3 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 3 September 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i3.5747

Abstract

The fire caterpillar Setora nitens Walker (Lepidoptera: Limacodidae) is a major pest of oil palm (Elaeis guineensis Jacq.) and causes significant economic losses through defoliation. This study aimed to analyze the population of S. nitens in two front observation schemes, PE1 (fronts 9, 17, 25) and PE2 (fronts 8, 16, 24), and to identify the dominant positions of larvae and the attack level as a basis for control. The study was conducted at Division 03 Naga Timbul, Begerpang Plantation of PT PP London Sumatra Indonesia Tbk., Deli Serdang Regency, North Sumatra Province, from February to April 2026. Sample trees were determined using purposive sampling based on classifications of light, moderate, and heavy attacks, with parameters including the number of eggs, live larvae, dead larvae, and pupae on the sample tree and six surrounding trees. The highest population of live larvae was found in the heavy attack category, with 469 individuals (PE1) and 177 individuals (PE2), averaging 21.4 individuals per tree. The highest number of pupae reached 394 individuals in the same category, indicating a potential risk of population explosion in the next generation. The dominant larvae were found in positions 1A and 1B at the tips of the 9th and 17th leaf sheaths, on the underside of the leaf, while no eggs were observed during the study. This is the first empirical comparison of the effectiveness of PE1 and PE2 in the field, as well as the establishment of the most representative anatomical positions of the leaf sheaths as a reference for standardizing pest censuses. It is recommended that control measures be prioritized in blocks with severe infestations, with monitoring focused on the 9th and 17th leaf sheaths at the tips of the underside of the leaf.
Causing Pathogens and Level of Attack of Leaf Spot Disease in The Main Palm Oil (Elaeis guineensis Jacq.) Nursery in North Labuhanbatu Aycel Ginting; Muhammad Yusuf Dibisono
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 3 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 3 September 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i3.5812

Abstract

Leaf spot disease is of constraint in oil palm nurseries because it can reduce quality and inhibit seedling growth of seedlings. This study aims to identify the pathogen causing leaf spot disease and determine the percentage and intensity of attacks in the main oil palm nurseries owned by the community in North Labuhanbatu Regency. The study used survey methods and purposive sampling in Kualuh Hulu, Kualuh Selatan, and NA IX-X districts. Symptomatic leaf samples were isolated on Potato Dextrose Agar (PDA) media and identified based on macroscopic and microscopic morphological characteristics. The results showed that Curvularia sp. is the pathogen causing leaf spot disease, while Alternaria sp. and Aureobasidium sp. are associated fungi. The percentage of attacks increased in the three districts, respectively, from 19.30% to 26.31%, 17.33% to 23.66%, and 29.57% to 35.94%. Attack intensity increased from 8.21% to 11.15%, 7.46% to 10.60%, and 13.68% to 16.46%. NA IX-X showed the highest attack rate. The results can serve as a basis for monitoring leaf spot disease in oil palm nurseries.
Analysis of the Effect of Sunlight Intensity on Leaf Spot Disease (Cercospora sp) in Edamame Plants (Glycine max (L.) Merrill) in Oil Palm Intercropping Systems Muhammad Akbar Maulana; Guntoro
JURNAL AGRONOMI TANAMAN TROPIKA (JUATIKA) Vol. 8 No. 3 (2026): Jurnal Agronomi Tanaman Tropika (JUATIKA) Vol. 8 No. 3 September 2026
Publisher : LPPM UNIVERSITAS ISLAM KUANTAN SINGINGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36378/juatika.v8i3.5854

Abstract

Edamame (Glycine max (L.) Merr.) is an important agricultural commodity in Indonesia, with increasing market demand both domestically and for export. One of the major biotic constraints in edamame cultivation is leaf spot disease caused by Cercospora sp. Environmental factors, particularly sunlight intensity and temperature, significantly influence the development of this disease. High sunlight intensity can reduce uredospore viability and limit fungal infection, while shaded or low-light conditions promote pathogen development due to increased humidity. This research aims to analyze the effect of sunlight intensity on the development of leaf spot disease caused by Cercospora sp. in edamame plants. The study was conducted at the experimental field of the Indonesian Palm Oil Institute, Medan, from March to May 2026. Parameters observed include disease incidence, disease intensity using a scoring scale, sunlight intensity measured with a lux meter, and temperature. The data were analyzed using ANOVA in SPSS. Results showed that disease intensity increased progressively from 0.02 to 0.60, and disease incidence reached 100% by early May 2026. Conidium count correlated positively and significantly with disease intensity (r = 0.747, p < 0.05), while sunlight intensity showed a weak, non-significant negative correlation (r = -0.143, p = 0.347). Multiple regression analysis (F = 30.083, p = 0.000) confirmed the significant simultaneous effect of both variables, with conidia count being the dominant factor in disease development.

Page 36 of 36 | Total Record : 358

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