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This study examines the determinants of the Jakarta Composite Index (JCI) based on three main macroeconomic factors namely inflation, the USD/IDR exchange rate, and the SBI interest rate (BI Rate) covering the period January 2020 to December 2025, in the context of post-COVID-19 pandemic recovery and global economic turmoil. A quantitative approach was employed using the Ordinary Least Squares (OLS) method, with 72 monthly observations derived from secondary data sourced from official institutions including Bank Indonesia (BI), the Central Statistics Agency (BPS), the Indonesia Stock Exchange (IDX), and the Financial Services Authority (OJK). Classical assumption tests were applied comprising the Jarque-Bera normality test, Variance Inflation Factor (VIF) for multicollinearity, Breusch-Godfrey for autocorrelation, White Test for heteroscedasticity, and Ramsey RESET for model specification. Partially, inflation, exchange rate, and BI Rate each demonstrate a positive and significant effect on the JCI (p < 0.05). Simultaneously, all three variables exert a significant combined influence on the JCI, with a coefficient of determination R² = 0.4414, indicating that the model explains 44.14% of the variation in the JCI. The remaining 55.86% is attributed to other variables outside the model. Classical assumption test results reveal violations of normality, autocorrelation, and heteroscedasticity assumptions, although the model is free from multicollinearity. These findings confirm that Bank Indonesia's monetary policy has a significant and measurable impact on capital market performance. Further research is recommended using more advanced time series models such as GARCH or VECM to address violations of classical assumptions and improve estimation efficiency.

This study aims to analyze the contribution and potential of the Lampung Province tourism sector to national economic growth in the 2020-2025 period. Using a quantitative descriptive approach using the Location Quotient (LQ) and Shift Share methods, this study processes secondary data on Gross Regional Domestic Product (GRDP) at constant prices from the Central Statistics Agency. The analysis shows that although Lampung's macroeconomic performance is still dominated by the primary sector, the tourism sector, particularly the accommodation and food and beverage subsector, has demonstrated post-pandemic resilience with a significant positive growth trend. In 2024, the GRDP value of this subsector at the provincial level reached IDR 4,616.76 billion, with strategic areas such as Bandar Lampung City confirming the accommodation sector as a base sector (LQ > 1) with a high competitive advantage. The integration of a creative economy based on local wisdom, such as the use of Tapis cloth and digital marketing, has been proven to increase the attractiveness of destinations, capable of driving the volume of domestic tourist trips to reach 17.87 million trips by 2024. This finding confirms that Lampung's tourism sector is not only a regional economic driver, but also makes a substantial contribution to national income through a multiplier effect on job creation and increasing domestic foreign exchange. Optimizing collaboration between policymakers and accelerating infrastructure development are key to strengthening the strategic position of Lampung tourism in the future.

Fruit rot disease is one of the main obstacles in the cultivation of guava (Psidium guajava) because it directly reduces the quality and selling value of the harvest. This research aims to identify and characterize the fungus that causes fruit rot disease in guava. The research was carried out by observing disease symptoms in the field, isolating the pathogen from infected fruit, as well as macroscopic and microscopic characterization of the fungus using Potato Dextrose Agar (PDA) media. The results of the research show that the initial symptoms are blackish brown spots on the surface of the fruit which develop into sunken lesions and spread to cause the fruit to dry out. The fungal isolate has white colonies with a flower-like pattern and forms black aservuli. Microscopic observation shows that the conidia are fusiform, insulated, with darker pigmented middle cells and have a transparent appendix. Based on these morphological characters, the fungus that causes fruit rot disease in guava is thought to belong to the genus Pestalotiopsis sp. Further research is needed through molecular approaches, such as PCR or DNA sequencing, as well as pathogenicity tests to strengthen and confirm the role of this fungus as the main cause of fruit rot disease.

This study investigates the factors influencing export performance in five ASEAN countries Indonesia, Malaysia, the Philippines, Singapore, and Thailand during the 2014-2023 period. The topic is highly relevant given the vital role of exports in sustaining monetary stability and promoting long-term economic growth. The novelty of this research lies in its integrated approach, which simultaneously examines key export-related macroeconomic variables, namely foreign direct investment and inflation, while incorporating foreign exchange reserves as a moderating variable an approach that remains limited in existing ASEAN-focused studies. This analysis uses secondary data obtained from the World Bank and processed using panel data regression methods, including the Common Effect Model, Fixed Effect Model, and Random Effect Model, strengthened by a Moderated Regression Analysis (MRA) approach. The results show that foreign direct investment and inflation significantly influence foreign exchange reserves. Furthermore, foreign exchange reserves have been shown to play a strategic role in strengthening the economic resilience of ASEAN countries and can be used as a reference in formulating monetary and international trade policies.

Financial management plays a crucial role in individual financial planning, particularly in the context of increasingly unstable macroeconomic conditions. Effective financial management behavior enables individuals to allocate resources wisely, manage risks, and achieve financial sustainability in the long term. Therefore, identifying the key factors that influence financial management behavior is essential. This study aims to analyze the effect of income and financial literacy on financial management behavior (FMB). The population of this study consists of teachers and administrative employees aged 24 to 60 years from two educational institutions located in Bandar Lampung and Metro. Using a snowball sampling technique, a total of 93 respondents were obtained. Data were collected through an online survey questionnaire designed to measure income level, financial literacy, and financial management behavior. The collected data were then analyzed using a multiple regression model to test the proposed hypotheses. The results of the analysis indicate that both income and financial literacy have a positive and significant effect on financial management behavior. Individuals with higher income levels tend to demonstrate better financial management practices, while greater financial literacy enhances individuals’ ability to plan, control, and make informed financial decisions. These findings highlight the importance of improving financial literacy and income management skills to strengthen financial management behavior, particularly among educators and educational staff.

Japanese kale (Brassica oleracea) is a leafy vegetable with high nutritional and economic value and strong potential for development through intensive cultivation systems, including polybag-based cultivation. Fertilization is an important factor determining plant growth success. This study aimed to analyze differences in the effects of cattle-manure compost fertilizer and NPK Mutiara fertilizer on the vegetative growth of Japanese kale, as well as to evaluate their roles in maintaining growing media fertility. The research employed a quantitative experimental approach using a single-factor Completely Randomized Design (CRD), namely fertilizer type. Treatments consisted of cattle-manure compost fertilizer and NPK Mutiara fertilizer, each with twelve replications, resulting in twenty-four experimental units. Observed parameters included plant height, leaf width, and growing media pH. The results showed that NPK Mutiara fertilizer produced better plant height and leaf width than compost fertilizer, particularly during the vegetative phase. This advantage was associated with the rapid availability of macronutrients such as nitrogen, phosphorus, and potassium for plant uptake. Meanwhile, cattle-manure compost fertilizer contributed to stabilizing growing media pH and improving soil physical and biological conditions. pH values in both treatments remained within the optimal range and did not limit plant growth. Therefore, NPK Mutiara fertilizer is more effective for short-term vegetative growth enhancement, whereas compost fertilizer supports sustainable growing media fertility.

Article 170 paragraph (1) of Law Number 1 of 2022 concerning HKPD emphasizes the synchronization of fiscal planning and policy for integrated national development. However, in the APBA (Aceh Provincial Budget) planning, discrepancies persist between the Aceh Government’s documents and the central fiscal policy direction, leading to synchronization that remains administrative rather than substantive. This issue is further complicated by Aceh's special status under Law No. 11 of 2006, which results in differences in macro indicators, program structure, and a lack of substantive participation from Aceh, creating epistemological inequality and structural injustice in central-regional financial relations. The research aims to understand why APBA management planning is not fully synchronized with government policy and to explore the ideal procedure for achieving synchronization, considering Aceh’s unique autonomy. This study is a normative juridical analysis using a legislative, conceptual, historical, and futuristic approach, with the application of authority theory, policy suitability theory, asymmetric decentralization theory, and good governance principles. The findings reveal that the lack of synchronization is caused by procedural issues, such as the absence of integration between RKPD (Regional Government Work Plan) and RKP (National Government Work Plan) schedules, the lack of a mechanism for reducing KEM-PPKF indicators, unclear fiscal support evaluation, and absence of guidelines and sanctions. Additionally, there are substantial issues like the incompatibility of Aceh's macro indicators with national targets. To achieve ideal synchronization, normative legality, equal central and regional authority, and integrated planning systems are needed.

The growing pressure on urban drainage systems caused by blockages and environmental pollution highlights the importance of developing sustainable filtration materials. This study explores the use of coffee waste as an environmentally friendly filler integrated into polyester fabric (PE 24S) to create a green filtration medium for drainage applications. The research focuses on developing and characterizing the composite material through macro-photographic morphology analysis, tensile strength testing, and antibacterial evaluation. The findings demonstrate that polyester fabric modified with coffee waste shows a tensile strength of 54.024 ± 5.498 MPa, elongation of 111.128 ± 6.915%, and a Young’s modulus of 0.486 ± 0.543 MPa, indicating improved flexibility and sufficient mechanical durability for drainage system use. Additionally, antibacterial testing reveals that the composite material can inhibit microbial growth due to the presence of natural bioactive compounds found in coffee waste. Overall, the results suggest that coffee waste–enhanced polyester fabric offers a sustainable and mechanically reliable alternative for environmentally friendly drainage infrastructure while supporting circular economy practices.

Male reproductive performance serves as a foundational metric for predicting the reproductive quality traits of progeny. This study aimed to investigate the interaction between semen quality in Etawa Grade (PE) and Boer bucks and non-genetic factors, specifically age and season. The research utilised secondary data on fresh semen production collected from 2018 to 2022. Quality parameters evaluated included ejaculate volume and individual sperm motility. Data were obtained from the Central Java Artificial Insemination Center and analysed using the Statistical Analysis System On Demand for Academics to determine the interactive effects of age and season on fresh semen production. The results indicated that bucks in the younger age category tended to produce higher semen volumes compared to other age groups. In conclusion, there is a general interaction between age and season on the semen quality of PE and Boer bucks. The interaction observed in fresh semen volume and motility was significantly influenced by individual age differences and seasonal factors based on rainfall levels. Further research is warranted to investigate these interactions across additional macroscopic and microscopic parameters.

This study aimed to determine the effect of different bait types on the catch of larval shrimp (Macrobrachium lar) using a lift net and to determine the best bait type in the waters of Cijeruk Indah, Garut Regency, West Java. The method used in this study was an experimental method with nine replications. The independent variables in this study consisted of three types of bait: earthworms, fine rice husks, and pellets, while the dependent variable was the weight of the larval shrimp caught. The results showed that different bait types significantly affected the larval shrimp catch. Based on the total catch during the study, pellet bait yielded the highest yield, with a total weight of 2,316 grams. This was followed by fine rice husk bait with a total weight of 1,256 grams, and earthworm bait with the lowest yield, at 364 grams. Data analysis using ANOVA showed a significance value of 0.031 (p < 0.05), confirming a significant difference in catch responses between the three bait types. In conclusion, pellets are the most effective type of bait to use in the anco net fishing gear in catching larval shrimp at the research location.

Oil palm (Elaeis guineensis Jacq.) is an important plantation commodity that makes a significant contribution to Indonesia's economy. One of the macro nutrients that plays a role in supporting plant growth is potassium (K), which is involved in various physiological processes. The effectiveness of nutrient utilization is not only determined by the amount of fertilizer applied but also influenced by the application method, especially during the early seedling phase. This study aims to examine the growth response of oil palm seedlings to variations in KCl fertilizer doses and different fertilizer application methods during the pre-nursery phase. The experiment was arranged using a Factorial Randomized Block Design (RBD) with two treatment factors, namely KCl fertilizer dose and fertilizer application method, each with three replications. The KCl doses consisted of five levels, while the application methods included watering, broadcasting, and localized application (pocket). The observation data were analyzed using analysis of variance and followed by Duncan Multiple Range Test (DMRT) at a 5% level if there were significant differences. The results of the study showed that there was no interaction between the dose of KCl fertilizer and its application method on all observed oil palm seedling growth parameters.

This study investigates Indonesia’s long-term economic transformation across four pivotal eras: the colonial period, the Old Order, the New Order, and the Reformasi era. Employing a descriptive qualitative design with historical analysis, the research elucidates how political transitions, institutional reforms, and global dynamics have interacted to shape the nation's economic architecture. Results indicate that colonial legacies entrenched deep structural inequalities and a dualistic economy, creating a path dependency that continued to influence policy direction after independence. During the Old Order, efforts to assert economic sovereignty were constrained by macroeconomic instability, limited state capacity, and shifting political coalitions. The New Order marked a turning point toward industrialization, macroeconomic stabilization, and openness to foreign investment, generating high growth but also deepening inequality and dependence on external capital. Entering the Reformasi era, decentralization, democratization of governance, and fiscal transparency reshaped institutional frameworks; however, persistent challenges such as regional disparities, productivity gaps, and vulnerability to global shocks remain evident. The study concludes that Indonesia’s economic evolution is non-linear, shaped by historical constraints and gradual institutional adaptation rather than abrupt shifts. Strengthening governance, enhancing domestic industrial competitiveness, and expanding inclusive development policies are essential strategies for supporting long-term resilience. These findings highlight the importance of continuity in policy reform to achieve sustainable growth and to realize the national vision of Indonesia Emas 2045.

In the investment world, stock returns are the leading indicator of a company’s performance and the basis for investor decision-making in the capital market. Fluctuations in stock returns reflect market expectations of the company’s prospects. The retail sector in Indonesia is facing significant pressure from post-pandemic shifts in consumer behavior and increased competition. This study aims to analyze the effect of financial distress, company size, liquidity, operating cash flow, and accounting profit on stock returns in retail sub-sector companies listed on the Indonesia Stock Exchange (IDX) during the period 2021 to 2023. This type of research is causally associated with a quantitative approach. The data used is secondary, in the form of financial statements from retail companies. The sampling technique used was purposive, yielding a total of 39 data points from 13 retail companies. Data testing was carried out using SPSS version 24. The results showed that partially, the variables of financial distress, company size, liquidity, and accounting profit had no significant effect on stock returns. Meanwhile, operating cash flow positively impacts stock returns. These findings indicate that fundamental indicators are not always the main determinants of stock returns. Therefore, investors are advised also to consider external factors such as market sentiment, macroeconomic conditions, and government policies that may have a greater influence on stock performance in the capital market.

Education has long been recognized as a primary determinant of economic progress and human development , yet in the context of a global economy characterized by rapid technological change and the sustainability imperative, the focus shifts from the mere quantity of investment to its effectiveness in fostering sustainable economic growth. Current education systems face significant challenges, including a persistent global "learning crisis" , governance inefficiencies , and a misalignment between curricula and the demands of the labor market, particularly the green and digital economies. Given that existing literature often treats education investment as a static input and fails to holistically integrate sustainability and governance into the optimization process , this conceptual article aims to bridge these theoretical and empirical gaps by proposing an integrated model for the optimization of education investment for sustainable economic growth. The method involves a conceptual analysis that synthesizes human capital theory , endogenous growth theory , and the economics of sustainability , emphasizing the roles of governance, innovation, and inclusivity as mediating factors. The key finding of the study indicates that optimization necessitates a paradigm shift from input-oriented budgeting toward an outcome-based investment framework that holistically balances three crucial dimensions: efficiency (maximizing learning outcomes) , equity (ensuring inclusive access) , and relevance (alignment with sustainability needs). The resulting policy implications are delineated across the Macro (fiscal integration and sustainability strategies through performance-based funding) , Meso (institutions transform into adaptive innovation centers) , and Micro (enhancement of reskilling, upskilling, and human capital capacity) levels; by achieving this alignment, education successfully transitions from a cost center to a strategic catalyst driving sustained prosperity.    

Stunting is a serious problem because it impacts long-term development, preventing children from reaching their full potential, leading to lower cognitive abilities, and increasing their susceptibility to future illnesses. It also impacts both macroeconomic and microeconomic income. SSGI data from 2022 shows that the stunting rate in Central Java was 20.8%, with the highest stunting rate in Central Java Province being in Brebes Regency at 29.1% in 2022. Pandansari Village is one of the villages in Paguyangan District with the highest stunting prevalence, with 129 children in 2023. This study aims to determine the effectiveness of the stunting reduction acceleration program in Pandansari Village. This study uses a descriptive qualitative method. Data collection was carried out through observation, interviews, and documentation. The focus of this study uses Budiani's effectiveness theory, namely. The results of the study are seen from five aspects, the first is the accuracy of the target in the aspect of the accuracy of the target of toddlers recorded by the posyandu cadres and village midwives so that the program is in accordance with the targets that have been previously determined and is in accordance with existing policies. Second, the aspect of program socialization where the existing program has been well socialized to program recipients through various existing activities which include stunting prevention. Third, the program objectives from this aspect, the objectives of the existing program have been effective because the stunting rate in Pandansari Village has decreased every year and also parents of toddlers have better understanding and pay more attention to healthy lifestyles for toddlers. And fourth, program supervision in this aspect, village cadres and midwives have provided regular supervision to program recipients and also provided reports to the village government, sub-district government and community health center every six months.  

The implementation of the core tax administration sistem (Core Tax Administration Sistem or Coretax) in early 2025, which was expected to modernise tax services, instead sparked a wave of public criticism due to various fatal technical obstacles. The dysfunction of this sistem not only hampered administration but also gave rise to discourse on distrust of state budget management. This study aims to analyse in depth how the failure to implement Coretax has eroded public trust and damaged the fiscal social contract between taxpayers and the state. The research method uses a qualitative approach with a Critical Discourse Analysis perspective based on Norman Fairclough's model. Data was collected through netnography from public comments and interactions on social media, then analysed through three dimensions: text (micro), discourse practice (meso), and social practice (macro). The findings show that public discourse is not merely technical complaints, but a form of symbolic resistance. At the micro level, sistem dysfunction is interpreted as evidence of incompetence and alleged budget irregularities. At the meso level, the public mobilises collective memory related to past government project failures to validate their distrust. At the macro level, this signifies a violation of the principle of reciprocity, whereby the state is perceived as demanding tax compliance without providing adequate services, thereby triggering a crisis of legitimacy. The implications of this study emphasise that digital transformation of the public sector requires transparency and accountability; failure to respond to this crisis has the potential to significantly reduce voluntary tax compliance.

The demand for lightweight materials with high mechanical strength has driven the development of aluminum alloys, particularly Al-Mg-Si, through deformation processes such as cold rolling. This study aims to analyze the effect of varying degrees of cold rolling deformation on the grain aspect ratio and macrohardness of homogenized Al-Mg-Si alloys. Deformation was applied at three thickness reduction levels—5%, 10%, and 20%—followed by microstructural characterization using optical microscopy and macrohardness testing in accordance with ASTM E-18 standards. The results show that increasing deformation levels lead to elongated grain morphology, with the grain aspect ratio rising from 1.16 to 2.07 and macrohardness increasing from 46.64 HRE to 62 HRE. The emergence of slip lines and grain flattening indicates the occurrence of intense plastic deformation, while work hardening results from dislocation accumulation that impedes further slip motion. These findings confirm a strong correlation between microstructural evolution and mechanical property enhancement in cold-deformed Al-Mg-Si alloys. This research contributes to the optimization of cold rolling parameters to produce engineering materials with a desirable balance of strength, formability, and fatigue resistance for applications in the mining and heavy manufacturing industries.

Al–Mg–Si aluminum alloys are widely utilized in engineering applications due to their low density, excellent corrosion resistance, and mechanical properties that can be modified through heat treatment. This study investigates the effect of homogenization on the microstructure and hardness of Al–Mg–Si alloys produced by the squeeze casting process. The experimental procedure involved alloy melting, squeeze casting at 76 MPa using preheated metal molds, followed by homogenization at 400 °C for 4 hours. Microstructural characterization was performed using optical microscopy to examine the dendritic morphology and measure the secondary dendrite arm spacing (SDAS). Mechanical properties were evaluated through Vickers microhardness and Rockwell macrohardness testing. The results show that homogenization increases the SDAS from 32.59 μm to 36.88 μm and decreases the volume fraction of interdendritic phases from 15.51% to 13.57%. Furthermore, microhardness decreased from 50.22 VHN to 38.58 VHN, while macrohardness decreased from 54.60 HRE to 46.64 HRE. These reductions are attributed to the partial dissolution of Mg₂Si precipitates into the aluminum matrix during homogenization. Overall, this research provides valuable insight into the optimization of initial heat treatment parameters for Al–Mg–Si alloys produced by squeeze casting. The findings highlight the role of homogenization in improving microstructural uniformity and preparing the alloy for subsequent deformation processes such as cold rolling and extrusion, particularly for structural components used in mining and heavy transportation industries.

Oil palm is a leading commodity that makes a major contribution to Indonesia’s economy, yet a significant productivity gap remains between actual and potential yields. A principal cause is suboptimal water management, which leads to flooding during the rainy season and drought in the dry season. This study develops a Conceptual Design (CD) for water management to map existing problems, analyse root causes, formulate improvement measures, and present a macro-level cost estimate for the study site. The research was conducted at an oil palm plantation in East Kalimantan anonymized as “PT XYZ.” The site was selected due to recurrent flooding and a recent change in ownership that limited data availability, making it well-suited for a CD-stage assessment. The objective is to identify water management issues and propose effective recommendations. A quantitative approach integrates primary data from field observations and measurements with secondary data. The analyses cover flood problem assessment, Water Management Zoning (WMZ/ZPA), rainfall analysis, hydrology, hydraulics, improvement proposals, and macro cost estimation. Results indicate that challenges are driven by swampy land conditions and inadequate channel and hydraulic structure capacity. Micro-watershed delineation using DEMNAS identified four ZPAs totalling 479–4,061 ha. Design rainfall was derived from CHIRPS satellite data using a log-normal distribution. Hydrologically, peak discharges range from 3.87–22.58 m³/s for the 2-year return period and 4.46–26.31 m³/s for the 5-year return period. Hydraulically, the proposed dimensions for rivers, outlet drains, carrier drains, and field-edge drains are 4×3×2 m to 9×7×3 m (T=2 years) and 4×3×2 m to 10×8×3 m (T=5 years), while collection and main drains are proposed at 3×2×2 m for both return periods. The total estimated investment for the 5-year design scenario is IDR 27,999,263,000.

Sweet corn (Zea mays L. saccharata) is a high-value horticultural crop whose productivity is closely linked to effective nutrient management, particularly the balanced application of macronutrients—nitrogen (N), phosphorus (P), and potassium (K). This study evaluates the agronomic and economic impacts of applying NPK compound fertilizer at varying doses (0.5×, 0.75×, 1.0×, 1.25×, and 1.5× the recommended rate) on sweet corn growth and yield performance. Field experiments demonstrated that NPK application significantly enhanced vegetative growth parameters, including plant height, leaf number, and stem diameter, with improvements ranging from 15.8% to 37.3% over the unfertilized control. Yield components such as ear length, husked ear weight, and dehusked ear weight also showed marked increases, resulting in higher total yields per plot and per hectare. Among the treatments, the 1.25× dose achieved the highest relative agronomic effectiveness (RAE) at 147%, indicating superior nutrient utilization and biomass conversion. However, the 1.0× dose yielded the most favorable economic outcome, generating a net profit of Rp. 10,780,200 and an R/C ratio of 1.47, suggesting optimal cost-efficiency. These findings underscore the dual benefits of NPK compound fertilizer in sweet corn cultivation, highlighting that precise dosage not only maximizes agronomic performance but also enhances economic viability. The study recommends adopting the 1.0× dose for balanced productivity and profitability, while the 1.25× dose may be considered in contexts prioritizing yield maximization.