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Journal of Tropical Crop Science
Published by Institut Pertanian Bogor
ISSN : 23560169     EISSN : 23560177     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Journal of Tropical Crop Science is an international journal publishing research related to tropical crops. Articles in the journal focus on in-vivo and in-vitro production and production environment, breeding, seed technology, physiology, postharvest, pest and pathology of cereals, vegetables, fruits, ornamentals, medicinal and plantation crops; soil, landscape, turf and agro ecology management under tropical conditions.
Arjuna Subject : -
Articles 320 Documents
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Estimation of Genetic Parameters for Selected Quantitative Traits in Introduced African Yam Bean (Sphenosylis stenocarpa Hochst. ex. A. Rich Harms) Genotypes Emmanuel Norman, Prince; Yannah Karim, Kumba; Sylvia Gloria Ethel Norman, Yvonne; Lonaah Vamboi, William
Journal of Tropical Crop Science Vol. 10 No. 03 (2023): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.10.03.205-212

Abstract

A solid understanding of the genetic control of traits within breeding populations is essential for selecting superior genotypes and parent plants for African yam bean (AYB) cultivation. In this study, we explored the phenotypic breeding values and genetic parameter estimates for various traits in 10 introduced AYB varieties. These traits included seed emergence speed (SES), seedling vigor index (SVI), final germination percentage (FGP), seed yield, days to first flower bud initiation (DAYSFBI), days to first flowering (DAYSF), and days to first pod initiation (DAYSPI). We conducted the trial using a randomized complete block (RCB) design with the following varieties: TSs2, TSs60, TSs11, TSs33, TSs282, TSs450, TSs10, TSs432, TSs424, and TSs151B. Traits showing high and medium genotypic coefficient of variation (GCV) were seed yield (20.7), SVI (12.1), and seed emergence speed (10.8), respectively. Traits with high phenotypic coefficient of variation (PCV) included seed yield (36.8), SVI (22.8), and SES (37.5). The presence of variability in all studied traits was evident from both GCV and PCV values. However, PCV values were slightly higher than GCV, suggesting the influence of environmental factors on these traits. Seed yield exhibited high genetic advance (23.9) and intermediate heritability (31.5%), while SES showed low heritability (8.4%) and low genetic advance (6.5), and FGP displayed low heritability (8.3%) and low genetic advance (2.1). High heritability and genetic advance in certain traits indicate the presence of additive gene action, suggesting that these traits can be improved through direct selection. These findings suggest the presence of valuable variations that can be harnessed for AYB genetic enhancement and selection purposes. Our study results offer valuable insights for the genetic improvement, conservation, management, multi-location evaluations, short-term recommendations, and potential release of new AYB genotypes.
Leaf Pruning Increased Seed Yield and Leaf Production of Cowpea (Vigna unguiculata L. Walp) Hartini Kilbaren, Muji; Purnamawati, Heni; Melati, Maya
Journal of Tropical Crop Science Vol. 10 No. 03 (2023): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.10.03.213-223

Abstract

The leaves and pods of cowpea (Vigna unguiculata L. Walp) have potential uses as vegetables. This research aimed to assess the impact on cowpea growth and seed yield through different pruning times, methods, intensities, and their interactions. Conducted at the Cikabayan Experimental Field, IPB University, between April and August 2022, the study employed a randomized complete block design with three factors and three replications. The first factor, pruning time (5 and 7 weeks after planting, WAP), represented vegetative and generative phases. The second factor involved pruning methods (leaf and shoot), while the third focused on pruning intensity (0, 10, 30, and 50% of leaf numbers). This resulted in 16 treatment combinations, replicated three times, yielding 48 experimental plots. Measured variables included pruned leaf count, pruned leaf weight, total leaf count, plant fresh and dry weights, cowpea plant C/N ratio analysis, pod wet and dry weights, pod count, pod length, seeds per pod count, 100-seed weight, dry seed weight per plant, dry seed weight per plot, and cowpea seed productivity. Results highlighted significant effects of pruning time, method, and intensity on leaf count, shoot fresh and dry weights, and C/N ratio of cowpea plants after two weeks of pruning. However, the treatments did not significantly influence cowpea seed yield. Pruning cowpea leaves led to an average pruned leaf weight of 30 g per plant, offering a nutritious vegetable source without compromising cowpea seed yield. These leaves commanded a market price of approximately Rp. 6000 per kg, transforming them into a valuable economic asset when utilized as vegetables, thus contributing to the sale of nutritious food.
Rice Yields at Different Dosages of Kieserite and Planting Systems Rozen, Nalwida; Kasim, Musliar; Dwipa, Indra
Journal of Tropical Crop Science Vol. 10 No. 03 (2023): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.10.03.224-228

Abstract

Rice stands as an important staple crop in Indonesia and Asia, prompting endeavors to enhance its production. One such technology, aimed at intensifying rice cultivation, involves optimizing plant density utilizing the "jajar legowo" system. This research was conducted within community rice fields located in Pasar Ambacang, Kuranji District, Padang City, West Sumatra, Indonesia, spanning from February 2020 to June 2020. The primary objective of this study was to assess the potential of the jajar legowo planting system, in conjunction with varying dosages of kieserite, to increase lowland rice yields. The study employed a two-factor experiment in a completely randomized design. The first factor is the jajar legowo types: A (25 cm x 12.5 cm x 50 cm) and B (25 cm x 25 cm x 50 cm). The second factor involved different kieserite dosages, comprising three levels (0, 150, 300 kg.ha-1). Each treatment combination was replicated four times. Our investigation unveiled that rice panicle length reached 27.20 cm under the influence of jajar legowo type A with a kieserite dosage of 150 kg.ha-1. Conversely, with the application of jajar legowo type B alongside a kieserite dose of 300 kg.ha-1, the rice panicle length increased to 27.88 cm. The highest yield was obtained with jajar legowo type A at a dose of 300 kg.ha-1, producing 5.35 tons.ha-1. It is recommended to implement the jajar legowo type A cropping pattern with the addition of 150 kg.ha-1 of kieserite, or jajar legowo type B with the addition of 300 kg.ha-1 of kieserite.
Effect of Allelopathy from Methanolic Extract of Broadleaf Weeds (Ageratum conyzoides and Borreria alata) on the Viability of Soybean Seeds (Glycine max L.) Karim Kilkoda, Abdul; Subkhan Mahulette, Asri; Leonard Madubun, Elia
Journal of Tropical Crop Science Vol. 10 No. 03 (2023): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.10.03.229-237

Abstract

The experiment aimed to investigate the allelopathic effects of active compounds present in broadleaf weeds Ageratum conyzoides and Borreria alata. The study also sought to assess the viability of various seed varieties grown using allelopathic extracts from these weeds, varying in concentrations of tannins and phenols. The research findings revealed that methanol extracts exhibited potent allelopathic properties, inhibiting germination, radicle and hypocotyl growth, as well as reducing the germination rate of soybean seeds. B. alata weed extracts demonstrated lower allelopathy than A. conyzoides, suggesting a possible alteration in the active compounds (allelochemicals) present due to a reforming process. Extracts from both A. conyzoides and B. alata weeds inhibited root length, hypocotyl growth, and germination across a range of concentrations, from low (10% v/v) to high (30% v/v).
Plant Reproductive Responses of Guava ‘Crystal’ Under Different Paclobutrazol and NPK Fertilizer Doses Widyastuti, Raden Ajeng Diana; Pujisiswanto, Hidayat; Adeline Warganegara, Hayane; Sabeth Sutriana, Eli
Journal of Tropical Crop Science Vol. 10 No. 03 (2023): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.10.03.238-243

Abstract

A preliminary study of the reproductive responses of crystal guava plants under varying doses of paclobutrazol and NPK fertilizer was conducted. The research took place in a small-scale ‘Crystal’ orchard in Rajabasa 1, East Lampung, from August 2021 to March 2022. The study employed a 3x3 factorial randomized complete block design, examining two factors: paclobutrazol and NPK fertilizer. The first factor, paclobutrazol (P), had three levels: 0 ppm (control), 2000 ppm, and 4000 ppm. The second factor, NPK fertilizer, was tested at three levels: 0 g per plant (control), 250 g per plant, and 500 g per plant. The key variables measured were the number of reproductive shoots, blooming flowers, and fruits, serving as indicators of the ‘Crystal’ guava plant's reproductive responses. The study findings recommended the application of 2000 ppm paclobutrazol and 500 g per plant of NPK fertilizer due to their significantly positive impact on increasing the number of reproductive shoots, blooming flowers, and fruits. Notably, there was no significant interaction observed between paclobutrazol and NPK treatments in regulating plant reproductive growth.
Development of Brown Seed and Release of “Biradama” Tef Variety for Potential Areas of Amhara Region and Beyond Ferede, Misganaw; Tariku, Sewagegn; Fentahun, Atalay; Fentahun, Atinkut; Misganaw, Gedefaw; Dagnaw, Zigale; Getaneh, Desalegn; Wale, Sefinew; Degenet, Yismaw; Chakle, Shumet; Taye, Yasin
Journal of Tropical Crop Science Vol. 11 No. 02 (2024): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.11.02.120-127

Abstract

Brown seed tef variety development did not get much attention as white seed in tef improvement program in Ethiopia. However, brown seed tef is locally demanded for home consumption and foreign markets. It has wider genetic variability that can be exploited in tef improvement program. Therefore, the study was conducted to develop high yielding brown seed tef variety with desirable agronomic and quality traits. Eighteen tef genotypes with standard and local checks were used for this study. The study was conducted at Adet (2019 and 2020), Mota (2019 and 2020), Takusa (2019 and 2020) and Finote Selam (2020) in Amhara region with a total of seven environments. A randomized complete block design with 3 replications was used in this experiment. The analysis of variances showed significant differences for the evaluated traits in genotypes, environments and genotypes by environment interaction. The genotype Accession # 236756-3 is a stable genotype than theother tested genotypes. The grain and straw yield performance of the genotype accession # 236756-3 was 2529 kg.ha-1 and 6040 kg.ha-1, respectively. It had 14.3% and 25.2% grain yield advantage over standard check “Filagot”, and the farmer’s variety, respectively. In addition, it had 13.6% and 19.4 % straw yield advantage over “Filagot” (standard check) and the farmer’s variety, respectively. A variety verification trial of the genotype accession # 236756-3 was conducted in test locations with a standard check (“Filagot”) and the farmer’s variety. The field performance of the verification trial was evaluated by National Technical Committee and released the variety for large production in tef production potential areas of Amhara Region and similar agro-ecologies of Ethiopia with a local name ‘Biradama”. This newly released variety can be used as parental material in the genetic improvements of tef. 
Phytochemical content of Maluku nutmeg (Myristica fragrans Houtt) in Inhibiting Skin Pathogenic Bacteria Wally, Pramita; Marwah, Andi Sitti
Journal of Tropical Crop Science Vol. 10 No. 03 (2023): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.10.03.244-252

Abstract

Banda nutmeg (Myristica fragrans Houtt) is one of the native species of Maluku that has various benefits other than as a cooking spice. Nutmeg, especially its fruit, offers significant advantages in the medical field as a natural dermatological product, effectively treating skin infections caused by pathogens. One such bacterial infection is pyoderma, characterized by the presence of pus-producing bacteria, leading to the formation of pustules or greenish-yellow crusts upon examination. Among the bacteria responsible for skin infections, Pseudomonas aeruginosa and Methicillin Resistant Staphylococcus aureus (MRSA) are notable bacterial species that cause skin infections. The active compounds found in nutmeg act as antibacterial agents by interfering with the peptidoglycan components within bacterial cells. This interference results in the formation of intact cell walls, ultimately leading to bacterial cell death. This study aimed to identify the bioactive profile of Maluku nutmeg extract metabolites and assess their inhibitory effects on pathogenic bacteria, specifically P. aeruginosa and MRSA, responsible for skin infections. The study revealed the presence of various bioactive compounds in nutmeg extract, including alkaloids, flavonoids, terpenoids, phenols, and tannins. Notably, the application of nutmeg pulp at an 80% concentration proved highly effective in inhibiting bacterial growth, surpassing the efficacy of the positive control. The enhanced effectiveness against MRSA, compared to P. aeruginosa, can be attributed to the higher concentration of secondary metabolites present in nutmeg extracts.
Effectivity of borate micro fertilizer on yield of cucumber (Cucumis sativus L.) Suwarto, Suwarto; Hilmi, Muhammad; Hapsari, Dhika Prita
Journal of Tropical Crop Science Vol. 11 No. 01 (2024): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.11.01.82-90

Abstract

Boron (B) is one of the most essential nutrients for fertilization and the production of fruits and seeds, however the availability of boron in soil is very limited. The aim for this experiment is to test the borate micro fertilizer to improve the growth and production of cucumber (Cucumis sativus). The fertilizer used in this experiment is borate micro fertilizer which contain 46% or 460 g.kg-1 B2O3. The experiment was conducted at Cibadak Village, Sukaresmi District, Cianjur Regency, West Java Province. Treatments in this experiment were arranged within five rates of fertilizer, which are: without fertilizer (P0); 0.5 rate of Borate fertilizer (0.5 B) (P1); 1.0 rate of Borate fertilizer (1.0 B) (P2); 1.5 rate of Borate fertilizer (1.5 B) (P3); and 2.0 rate of Borate fertilizer (2.0 B) (P4). The result showed that the treatment of 0.5 to 2.0 rate of borate micro fertilizer can produce growth characteristics and plants that are better compared to the control treatment. Applicating 0.5 rate of borate micro fertilizer even has the capacity of yielding production up to 48.960 kg.ha-1. The 0.5 rate of Borate micro fertilizer treatment was concluded as the most effective one compared to other treatments, due to its capacity to produce the highest relative agronomical effectivity value, which is 152%. The recommended rate of Borate fertilizer is 25 kg.ha-1 given by soil drench at 15 and 30 DAP (days after planting) with the concentration is 1.5 g.L-1 and the volume is 250 ml/plant.
Modification of The Spectrophotometric Analysis Protocol by Sims D. and Gamon to Analyze Leaf Pigment Content using Green Spinach (Amaranthus hybridus) as a Model Plant Yudiansyah, Yudiansyah; Ismiyanti, Ismiyanti; Aziz, Sandra Arifin
Journal of Tropical Crop Science Vol. 11 No. 02 (2024): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.11.02.147-154

Abstract

The analysis of pigment content in plants, particularly chlorophyll a, chlorophyll b, anthocyanin, and carotenoids, is crucial to assess their physiological performance. The spectrophotometry method by Sims and Gamon offers practicality and reliable results. This research established several variables to achieve more precise results. Green spinach leaf samples were used as a model to analyze their pigment content, determining the minimum sample area or weight, the maximum limit that does not violate Beer’s law, and the temperature during analysis. The limit of quantitation (LoQ) is the smallest quantity of analytes in a sample that still meets the criteria for accuracy and precision in testing. The research results show that using a leaf punch with a diameter of 9 mm approaches the LoQ value. To avoid measurements nearing the LoQ limit, it is advisable to use leaf punch diameters of 10- or 12-mm. Leaf punches of 22 mm are still safe to use, as there has been no deviationfrom Beer’s law. Using unchilled acetone at 27°C did not show significant differences compared to using cold acetone at 7°C for the content of chlorophyll a, total chlorophyll, and carotenoids. However, for chlorophyll b and anthocyanin, despite significant differences, the chlorophyll content measured at room temperature was more practical and relatively higher compared to cold acetone, thus disproving concerns about pigment damage.
Quality and Production Potentials of Various Types of Taro Cormel Fauzan, Rafi; Widajati, Eny; Palupi, Endah Retno; Santosa, Edi
Journal of Tropical Crop Science Vol. 11 No. 02 (2024): Journal of Tropical Crop Science
Publisher : Department of Agronomy and Horticulture, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jtcs.11.02.137-146

Abstract

Taro is a promising food crop that can be developed as a significant source of carbohydrates; however, a major obstacle is the unavailability of high-quality planting materials. Due to the difficulty in obtaining seeds, taro cultivation generally relies on vegetative propagation materials such as cormels, cormlets, and stolons. The advantage of using vegetative propagation material is that it retains the same characteristics as the parent plant. This research aimed to evaluate the quality of various types of cormels as taro planting material, study the potential of different types of cormels on the growth and production of taro plants, and investigate the growth, development, and time required to produce cormels from various types of cormels and their potential in cormel seed production. The research consisted of two experiments: the first experiment evaluated the quality of several types of cormels from two taro accessions (S24 and S28) using a completely randomized design with two factors (accession and types of cormels—primary, secondary, and tertiary), while the second experiment studied the growth and development of cormels from various types of cormels. The best quality seeds were obtained from primary cormels directly attached to the main tubers, with the germination rate highest for primary cormels at 53.25%, followed by secondary cormels at 51.59%, and tertiary cormels at 39.42%. Accession S24 showed a faster emergence rate (30.26 days) compared to S28 (58.08 days), and in S24, there was no significant difference between types of cormels for this parameter. In contrast, in S28, primary cormels had a significant emergence advantage (33.65 days) over secondary and tertiary cormels (62.57 and 78.02 days, respectively). Additionally, primary cormels were formed 8 weeks after planting, while secondary and tertiary cormels appeared 12 weeks after planting. These findings suggest that primary cormels should be prioritized for use in taro propagation to improve growth, development, and yield, highlighting their potential in cormel seed production and offering a viable solution to the challenge of seed availability in taro cultivation.

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