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Kota mataram,
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INDONESIA
Jurnal Biologi Tropis
Published by Universitas Mataram
ISSN : 14119587     EISSN : 25497863     DOI : -
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology
Jurnal Biologi Tropis (ISSN Cetak 1411-9587 dan ISSN Online 2549-7863) diterbitkan mulai tahun 2000 dengan frekuensi 2 kali setahun oleh Program Studi Pendidikan Biologi PMIPA FKIP Universitas Mataram, berisi hasil penelitian dan ulasan Ilmiah dalam bidang Biologi Sains.
Arjuna Subject : -
Articles 2,949 Documents
 286   287   288   289   290 
Effects of Salinity Stress and ACC Deaminase Sidr Root PGPR Frequency on Growth and Yield of Chili Pepper Niza Isfiyana; Aluh Nikmatullah; M. Taufik Fauzi
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12625

Abstract

Salinity stress is a major abiotic factor limiting chili pepper (Capsicum annuum L.) production by reducing water and nutrient uptake and increasing stress-induced ethylene accumulation. Plant Growth-Promoting Rhizobacteria (PGPR) producing 1-aminocyclopropane-1-carboxylate (ACC) deaminase have emerged as a promising biological approach to alleviate salt stress by lowering ethylene levels and promoting plant growth. This study aimed to evaluate the interaction between salinity levels and the application frequency of ACC deaminase-producing PGPR isolated from bidara (Ziziphus mauritiana) roots on chili pepper growth. A factorial randomized complete block design was employed with two factors: salinity levels (0, 2, 4, and 8 dS m⁻¹) and PGPR application frequencies (0, 1, 2, and 3 applications). Data were analyzed using analysis of variance followed by Tukey's HSD test at a 5% significance level. Significant interactions were observed for plant height, leaf number, fresh biomass, root biomass, shoot dry weight, and total dry weight. Increasing salinity significantly reduced plant growth, whereas repeated PGPR application improved vegetative performance. The highest biomass was obtained under non-saline conditions with two PGPR applications, while three applications produced the greatest plant height and leaf number. These findings demonstrate that ACC deaminase-producing PGPR from bidara roots effectively mitigates salinity stress and has potential as an environmentally friendly bioinoculant to improve chili pepper growth under saline conditions.
Effects of Salinity and Concentration of ACC-deaminase PGPR from Bidara Root on Chili Growth and Yield Baiq Safinatun Naja; Aluh Nikmatullah; Ni Made Laksmi Ernawati
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12627

Abstract

Soil salinity is an escalating challenge in dryland agriculture, where rising electrical conductivity disrupts water balance and nutrient uptake. These stresses stimulate excessive ethylene production, which suppresses root growth and reduces overall plant vigor. Plant growth–promoting rhizobacteria (PGPR) with ACC deaminase activity offer a promising mitigation strategy by degrading ACC, the ethylene precursor, thereby helping plants maintain growth under saline conditions. This study evaluated the effect of different concentrations of ACC deaminase producing bacteria isolated from Bidara (Ziziphus mauritiana Lam.) roots on chili (Capsicum annum L.) growth under graded salinity stress. Bacterial cultures were harvested at OD₆₀₀ = 0.8 and applied at three concentrations (0, 10, and 20 mL/L) to chili seedlings exposed to four salinity levels (0, 2, 4, and 8 dS/m). Growth parameters—including plant height, leaf number, biomass, and root development—were measured to assess physiological responses. Results showed that increasing salinity progressively reduced plant growth, with substantial inhibition observed at 8 dS/m. In contrast, bacterial application significantly improved plant performance across all salinity levels, and the 20 mL/L concentration consistently produced the greatest enhancement. The improved growth is attributed to enhanced root system function and chlorophyl concentration. These findings highlight the essential role of ACC deaminase producing bacteria in mitigating salinity stress in chili cultivation under dryland conditions and underscore the importance of optimizing bacterial concentration to maximize their beneficial effects.
Differences in Ratio in Formulas on The Performance of Local Male Rabbits Duwi Kurniawan; Engkus Ainul Yakin
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12644

Abstract

Local rabbits are livestock with potential for development as a source of animal protein due to their high reproductive capacity, relatively rapid growth, and good adaptability to tropical environments. The success of rabbit farming is heavily influenced by the quality and quantity of feed provided; feed that fails to meet energy and protein requirements can lead to poor growth and reduced productivity. Therefore, proper ration formulation is essential to supply nutrients according to the animals' needs. This study aimed to determine the differential effects of ration formulas on the performance of male local rabbits, specifically regarding feed intake, average daily gain (ADG), and feed conversion ratio (FCR). The study was conducted over 28 days in Segawe Village, Jenawi District, Karanganyar Regency, using a Completely Randomized Design (CRD) with three treatments—P1 (40% forage + 60% concentrate), P2 (60% + 40%), and P3 (80% + 20%)—and four replicates. ANOVA and DMRT were used to evaluate the data. The findings demonstrated that while the ration formula had no significant influence (P>0.05) on ADG or FCR, it had a highly significant effect (P<0.01) on feed intake. Although P1 tended to be more physiologically efficient, P3 had the highest feed intake (156.65 g/head/day) and P1 had the lowest (117.37 g/head/day).
Impact Sugar Type, Fermentation Duration, and Concentration of Eco-Enzyme on pH, TDS, and Antibacterial Activity Ni Putu Vidya Primarista; Damiana Nofita Birhi; Faustina De Yesu Prisila Abi; Fena Retyo Titani; Arya Wiranata; Abdul Rohman Wali
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12651

Abstract

Eco-enzymes produced from fruit and vegetable waste are increasingly used for waste valorization and natural disinfection, but the combined effects of sugar type, fermentation duration and dilution on their quality remain unclear. This study examined eco-enzymes from mixed fruit peels prepared with granulated sugar, brown sugar and molasses, fermented for 1, 2 and 3 months, and diluted to 20%, 10%, 1%, 0.2% and 0.1%. Physicochemical properties (pH, TDS) and antibacterial activity against Staphylococcus aureus and Escherichia coli were measured; data were analysed by one-way ANOVA with Tukey’s test and Pearson correlation. Eco-enzymes were strongly acidic (≈3.5–3.9) at 20–10% and approached neutrality at 0.1%, with molasses-based formulations maintaining the lowest pH at high dilutions. TDS showed fermentation‑time‑dependent trends that differed between concentrated and dilute solutions. No inhibition was observed in month 1; activity appeared after ≥2 months and was highest at 3 months, with three‑month molasses eco-enzymes at 20% giving the largest inhibition zones and retaining activity at 0.1–0.2%. These findings identify molasses and extended fermentation as key levers to improve eco-enzyme performance as low-cost natural antibacterial agents.
Community Structure of Rhopalocera Butterflies in The Sendang Gile Waterfall Area, North Lombok Nurrifta Zaitun; Mohammad Liwa Ilhamdi; I Putu Artayasa
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12652

Abstract

Butterflies of the suborder Rhopalocera play an important ecological role as pollinators and bioindicators of environmental quality. The Sendang Gile Waterfall area, North Lombok, contains diverse habitats that potentially support a high diversity of butterfly species, yet information on their community structure remains limited. This study aimed to identify the species composition and analyze the community structure of Rhopalocera butterflies in the area. The research was conducted from April to May 2026 at four observation sites using a survey method. Butterflies were collected using sweep nets and identified based on morphological characteristics. Community structure was analyzed using the Shannon–Wiener diversity index (H′), Pielou evenness index (E), and Simpson dominance index (D). A total of 1,207 individuals representing 31 species from six families were recorded. Pieridae was the most abundant family, followed by Nymphalidae and Papilionidae, whereas Riodinidae, Lycaenidae, and Hesperiidae were represented by relatively few individuals. The waterfall site showed the highest diversity (H′ = 2.73) and evenness (E = 0.91), while Gate 1 had the lowest diversity (H′ = 2.10) and evenness (E = 0.67). Dominance values at all observation sites were low (D < 0.5). These results indicate that the Rhopalocera butterfly community in the Sendang Gile Waterfall area is relatively stable, with moderate to high species diversity, high evenness, and low dominance.
The Effects of Red Onion Peel Liquid Organic Fertilizer and NPK Fertilizer on Chlorophyll Content and Vegetative Growth of Kangkung Darat (Iphomoea reptans Poir) Raudatul Jannah; Ahmad Raksun; Gde Cahyadi Wirajagad
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12663

Abstract

This study aimed to determine the effect of red onion peel Liquid Organic Fertilizer, NPK fertilizer, and their interaction on the chlorophyll content and vegetative growth of Kangkung Darat. The research used a completely randomized design factorial with two factors: Liquid Organic Fertilizer dosage (0, 10, 20, 30 ml) and NPK dosage (0, 0.5, 1, 1.5 g). Four nitrogen rates (25%, 50%, 75%, and 100% of the recommended dose) and two phosphorus rates (50% and 100% of the recommended dose), each replicated three times, were used in the factorial Randomized Complete Block Design experiment, which was carried out in Rembige Village, Mataram City, between February and April of 2026. Analysis of variance and the Honestly Significant Difference test at the 5% significance level were used to evaluate the data. At 42 and 49 days following planting, nitrogen had a substantial impact on both the number of bulbs per clump and plant height. While the interplay between nitrogen and phosphorus had a substantial impact on leaf chlorophyll content, phosphorus had a considerable impact on bulb number, bulb diameter, and fresh bulb weight. This study concludes that the application of red onion peel Liquid Organic Fertilizer can complement or optimize the efficiency of NPK fertilizer, reducing environmental reliance on chemical inputs.
Association Between Protein Intake and Stunting Among Children Aged 6–24 Months in the Bagi Community Health Center Catchment Area, Central Lombok Regency Muhammad Rafly; Lina Nurbaiti; Wiwin Lastyaana
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12672

Abstract

Stunting is still a long-term nutritional issue and a significant concern for public health, especially in children younger than two years. Protein is a vital nutrient that is important for growth in height; however, the information about its relationship with stunting is not consistent. Understanding this relationship is crucial for designing effective nutritional interventions. A cross-sectional study was conducted involving 43 children who met the inclusion and exclusion criteria. Protein intake was assessed using a 1×24-hour food recall and analyzed with NutriSurvey software. Stunting status was determined based on height/length-for-age (HAZ) according to WHO standards. The association between protein intake and stunting was analyzed using the Chi-Square test with the Monte Carlo Exact method. The results of the study showed that of all toddlers studied, 62.8% experienced stunting and 37.2% experienced severe stunting. The majority of toddlers had good protein intake (55.8%). Statistical evaluation through the Chi-Square test with the Exact (Monte Carlo) method indicated that there was no meaningful connection between protein consumption and the occurrence of stunting (p = 0.584). In the region served by Bagu Community Health Center, Central Lombok Regency, there was no significant association between protein intake and the prevalence of stunting in children aged 6–24 months.
Shallot (Allium cepa L.) Growth and Yield under Nitrogen and Phosphorus Fertilization in Former Long Bean Fields Miftahul Janah; Anjar Pranggawan Azhari; Afifah Farida Jufri
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12685

Abstract

Shallot (Allium cepa L.) is a high-value horticultural crop whose productivity depends on adequate nutrient availability and fertilizer management. Former yardlong bean land has the potential to improve fertilizer efficiency through residual nitrogen derived from biological nitrogen fixation. This study aimed to evaluate the effects of nitrogen (N) and phosphorus (P) fertilizer rates and their interaction on the growth and yield of shallot cultivated on former yardlong bean land. Four nitrogen rates (25%, 50%, 75%, and 100% of the recommended dose) and two phosphorus rates (50% and 100% of the recommended dose), each replicated three times, were used in the factorial Randomized Complete Block Design experiment, which was carried out in Rembige Village, Mataram City, between February and April of 2026. Analysis of variance and the Honestly Significant Difference test at the 5% significance level were used to evaluate the data. At 42 and 49 days following planting, nitrogen had a substantial impact on both the number of bulbs per clump and plant height. While the interplay between nitrogen and phosphorus had a substantial impact on leaf chlorophyll content, phosphorus had a considerable impact on bulb number, bulb diameter, and fresh bulb weight. The combination of 75–100% recommended nitrogen and 100% recommended phosphorus produced the best growth and yield, indicating that former yardlong bean land can enhance fertilizer use efficiency in shallot cultivation.
Typical Fish Protein and Fish Waste Kiki Haetami; Aditia Aditia; Azmi Dhiyaulhaq; Abun Abun
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12687

Abstract

Fishery waste such as offal, skin, and bones still contains high-value protein that has the potential to be processed into protein hydrolysates and gelatin. This study aims to analyze the utilization of fish waste and its biochemical changes during storage. The method used was a descriptive literature review. The results show that protein hydrolysis produces bioactive peptides with antioxidant activity. Furthermore, the formation of natural formaldehyde in fish occurs due to the degradation of TMAO by enzymes, which persists at low temperatures. The use of natural ingredients as preservatives can slow down deterioration, while pH sensor technology can help visually monitor fish freshness. Utilizing fish waste and implementing supporting technologies is a strategic step in increasing the added value and quality of fishery products.
Financial Analysis of Egg-Laying Chicken Business, MSME Program, Animal Husbandry Study Program, Flores Bajawa Agricultural College Marten Umbu Kaleka; Maria Alfonsa Ngaku; Egidius Rembo
Jurnal Biologi Tropis Vol. 26 No. 3 (2026): Juli - September
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i3.12690

Abstract

The livestock sector plays a crucial role in the Indonesian economy, both in determining total national output and creating jobs. The egg-laying chicken business is one of the businesses in the livestock sector that offers significant and promising opportunities and is currently being widely developed. This study aims to analyze the financial sustainability of the MSME Program in the Animal Husbandry Study Program at the Flores Bajawa Agricultural College. The method used in this study is a case study. This method is used to fully explore the program's impact, financial success, and benefits obtained from the program. Data techniques used are in-depth interviews and literature studies, so the data used are primary and secondary data. Based on the research results and discussion above, it can be concluded that the MSME Program in the Animal Husbandry Study Program provides students with increased experience and competency in developing entrepreneurial knowledge and skills in the livestock business. From a financial aspect, the egg-laying chicken business shows positive value and is worth continuing because it provides financial benefits for both the institution and the study program, especially supporting the sustainability of the MSME program itself. Using a 12% discount rate, the NPV is greater than 1 for IDR 4,358,165.02, while the Net B/C is greater than 1.10, and the IRR is greater than 12%.

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