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As a high-value crop, potatoes necessitate balanced nutrient management for optimal growth and yield. This research aimed to assess how varying applications of NPK 20-20-10 fertilizer influenced potato growth, yield, tuber quality, agronomic efficiency, and economic viability within tropical climates. The experimental setup involved a randomized complete block design, incorporating four replications across seven distinct treatments: a control, a standard inorganic fertilization regimen, and NPK 20-20-10 applied at 0.50, 0.75, 1.00, 1.25, and 1.50 times the suggested dosage. The findings indicated that applying NPK 20-20-10 significantly enhanced several parameters, including plant height, branch count, tuber count, tuber weight, and overall yield components, when contrasted with the control group. Notably, the 1.25 times recommended dose demonstrated superior performance, leading to a 34.9% increase in tuber number and a 68.6% rise in tuber weight compared to the control. Agronomic effectiveness scores surpassed 100 for dosages ranging from 0.75 to 1.50, with the 1.25 dose registering the peak value. Economic evaluations confirmed the profitability of all NPK treatments, and the 1.25 dose yielded the most favorable R/C ratio and a net profit of IDR 29,053,400. Consequently, the recommended application for potato cultivation is 675 kg/ha of NPK 20-20-10, distributed in three equal parts at planting, four weeks post-planting, and six weeks post-planting. Thus, these results underscore that NPK 20-20-10, when applied at 1.25 times the recommended rate, presents an agronomically effective and economically sound strategy for sustainable potato farming in tropical settings.

Waste has become a serious environmental problem in Indonesia, which continues to increase along with population growth. The issue of waste management poses serious challenges for the environment, especially in the process of separating organic and inorganic waste. In the field of computer vision, recognising the type and shape of waste through camera images remains a challenge due to variations in shape, colour, and complex lighting conditions. Therefore, this problem utilises Deep Learning technology, which is expected to be widely applied in Indonesia, especially in large cities with high waste volumes. This study aims to distinguish between organic and inorganic waste using the Convolutional Neural Network (CNN) method based on digital images. The developed CNN model was trained to recognise the visual patterns of each type of waste and tested to measure its accuracy. The test results show that the CNN-based classification system is capable of achieving an accuracy rate of 95%, thus proving the effectiveness of this method in supporting artificial intelligence-based automatic waste sorting systems.

Management of household waste in Final Disposal Sites (TPA) faces a serious problem, where most of the waste accumulates and is difficult to decompose due to its complex nature. This condition substantially inhibits natural decomposition processes and limits the effectiveness of recycling efforts. Pre-processing operations, such as sorting and crushing, which are still dominated by manual methods, are proven to be inefficient, high-risk, and require large allocations of land resources and manpower. Therefore, automated technological innovation is needed to facilitate the efficient separation of organic components from inorganic materials (packaging). This research was conducted to determine the design and structural strength analysis of a hammer mill type depackaging machine, carried out using Solidworks software. Structural analysis simulation utilizes Finite Element Analysis (FEA) to determine the structural strength of the machine. The specifications of the hammer mill type depackaging machine include a capacity of 3000 kg/hour, a hammer mill input power of 12 KW, and a rotational speed of 2500 rpm with a torque of 34.54 Nm. Meanwhile, the screw conveyor input power is 0.75 KW and the rotational speed is 20 rpm. The FEA simulation analysis results for the hammer mill type depackaging machine showed that the maximum Von Mises stress value recorded is 3,022×10^7   N⁄m^2 , the maximum displacement value measured is very minimal, namely 2,793×10^(-1)  mm, and the Factor of Safety (FOS) obtained is 8.3. This FOS value significantly exceeds the required minimum safety limit (>3), confirming that the machine design has optimal reliability, fatigue resistance, and structural integrity for operation under intensive working conditions at the TPA. The conclusion of this study indicates that the engineering design of this hammer mill type depackaging machine is safe and meets structural technical requirements to proceed to the implementation phase, potentially becoming a sustainable technological solution in improving the efficiency of waste pre-processing.

Dependence on chemical fertilizers has caused a decline in soil quality, groundwater contamination, and rising agricultural production costs due to unstable fertilizer prices. In recent years, frequent fertilizer crises have revealed the fragility of reliance on inorganic fertilizers within the national agricultural system. Hence, a transformation toward environmentally friendly and sustainable agriculture is urgently required. This study employed a scoring technique to analyze field observation data, which were narrated based on the written methodology. Respondents’ answers were categorized and classified according to their assumptions or opinions, with scores determined using a Likert scale. The Likert scale measures attitudes, opinions, and perceptions of individuals or groups regarding specific social phenomena. The results showed that key driving factors—such as affordable fertilizer prices, support from agricultural extension workers, and social encouragement from the community—achieved scores above 82%. This finding indicates that external conditions are quite favorable for promoting the use of organic fertilizers. However, major challenges remain, including the limited availability of organic fertilizers in the field and farmers’ long-standing dependency on chemical fertilizers. To address these challenges, it is essential to enhance the market availability of liquid organic fertilizers (POC) through collaboration between producers and farmer groups. Continuous technical assistance should be provided, including demonstration plots that display tangible improvements in rice yields using POC. Furthermore, government support in the form of targeted subsidies or special incentives for farmers transitioning to organic fertilizers is vital, while strengthening the role of farmer groups and agricultural extension workers as catalysts for the adoption of environmentally friendly innovations.

Population growth and lifestyle changes in Indonesia have led to complex waste management issues, negatively impacting social, health, and environmental sustainability aspects. To address this, a sustainable management approach that actively involves community participation is necessary. The concept of a Waste Bank, based on the 3R principles (Reduce, Reuse, Recycle), emerges as a strategic, community-based solution. This community service program aims to encourage active community participation in the Waste Bank program in Tanjung Uban Selatan, Bintan Regency, while supporting the realization of a Smart City based on intelligent and participatory environments. The methodology used is a qualitative approach to gain in-depth understanding. Primary data collection was carried out through interviews, participatory observations, and documentation studies. Key informants were purposively selected from various stakeholders, including Waste Bank administrators, local government representatives, and community members. The results show that, although initially challenging to increase community participation, the program has had a significant positive impact. It successfully shifted the community's view of waste as a valuable economic resource. Quantitatively, this is reflected in stable income from the sale of high-quality inorganic waste, such as metals and electronic waste. The program also led to strategic innovations, including sustainable education, waste savings incentives, social media use, and the "Dasi Umat" empowerment program. The success of this program, strengthened by awards at the district and national levels, makes it a model for sustainable waste management focused on community empowerment and supporting smart city development.

This research focuses on the synthesis and characterization of the double salt copper(II) ammonium sulfate hexahydrate, Cu(NH4)2(SO4)2·6H2O. The study aims to obtain the compound in crystalline form and evaluate its properties through yield calculation, solubility testing, and Fourier Transform Infrared (FTIR) spectroscopy. The synthesis involved reacting copper(II) sulfate pentahydrate (CuSO4·5H2O) with ammonium sulfate ((NH4)2SO4) under controlled conditions, followed by crystallization. The process produced 10.84 grams of crystalline Cu(NH4)2(SO4)2·6H2O with an 86.23% yield, indicating efficient synthesis. Solubility tests showed that the crystals were polar, soluble in polar solvents like water and hydrochloric acid (HCl), partially soluble in ammonium hydroxide (NH4OH), and insoluble in less polar solvents like ethanol and chloroform (CHCl3). FTIR analysis confirmed the presence of functional groups such as O–H, N–H, and S–O stretching vibrations, supporting the proposed molecular structure. The findings demonstrate that Cu(NH4)2(SO4)2·6H2O can be efficiently synthesized, and its physicochemical properties align with theoretical expectations. This study contributes to the understanding of double salt synthesis and characterization, relevant for inorganic chemistry, material science, and potential applications in catalysis and coordination chemistry.

The problem of waste in rural areas is still a serious issue that has an impact on environmental health and the quality of life of the community. Batu Licin Village, Gunung Lengkuas Village, East Bintan District, Bintan Regency is one of the areas that faces similar problems, where household waste is still scattered and has not been handled optimally. This community service activity offers innovative solutions through the manufacture of rocket stoves as a means of efficiently burning certain organic and inorganic waste, as well as the construction of garbage booths as a place to store and sort waste before further processing. The implementation method involves counseling to residents, making prototypes, and direct practice of using rocket stoves and garbage booths by local communities. In addition, this activity also emphasizes the importance of changing community behavior in managing waste with the 3R (reduce, reuse, recycle) principle. The results of the activity show an increase in public awareness in managing waste independently, reducing the accumulation of waste in the village environment, and the emergence of alternative waste processing that is environmentally friendly, energy-efficient, and easy to apply. This innovation not only helps overcome the problem of household waste, but also provides educational value and empowers the community in maintaining the cleanliness and sustainability of the village environment. With the implementation of rocket stoves and garbage booths, it is hoped that a cleaner, healthier, and more viable village environment will be created in the long term.

Ineffective management of household waste in rural areas, such as Aek Korsik Village, Aek Ledong District, Asahan Regency, causes air pollution due to traditional waste burning practices. This research aims to design and implement an environmentally friendly low-smoke waste incinerator as an alternative solution based on simple technology and local resources. The research methods used are technological engineering approaches and field studies, including tool design, trials, and environmental and social impact evaluation. The furnace is designed using heat-resistant local materials and mild steel, features a dual ventilation system and a smoke exhaust system with a simple filter, and has a combustion capacity of 5 kilograms per cycle. Preliminary studies show that the composition of waste is dominated by organic matter (60%), plastic and paper (30%), as well as the rest are inorganic. Testing over several weeks showed that an average burn time of 1.5 hours was able to reduce smoke emissions by up to 60% compared to conventional methods. The air quality around the test site has improved significantly, and the community has responded positively to the ease of use and environmental benefits of the furnace. This study concludes that low-smoke combustion furnaces are effective as environmentally friendly waste management solutions in villages, with recommendations for increasing combustion capacity and integrating other waste management methods to support sustainability and environmental preservation.

Schools are not only institutions for the transfer of knowledge but also environments that play a crucial role in shaping students’ behavior and instilling positive habits, one of which is environmental care. One form of environmental concern that can be cultivated from an early age is the discipline of disposing of waste properly. However, SD Negeri Jambewangi, located in Dusun Pesantren, has not yet fully implemented effective waste sorting practices. Waste disposal is still carried out without distinguishing between organic and inorganic waste, which may have negative impacts on the school environment. To address this issue, community service activities were carried out by KKN students from Universitas Tidar through outreach programs and the distribution of sorted waste bins. The socialization activity applied the Extend Parallel Process Model (EPPM) communication strategy using a Severity Model approach, which emphasized the dangers and consequences of improper waste management practices. During the sessions, students were encouraged to discuss and identify various types of waste, as well as the potential environmental and health impacts associated with them. Direct practice was also provided by encouraging students to actively participate in sorting waste before disposal into the designated bins. The implementation of this program showed a positive impact, as students demonstrated an increased understanding of waste management and began to practice sorting waste more consistently. The provision of separate bins for organic and inorganic waste further facilitated this new habit. It is expected that the discipline of sorting and properly disposing of waste will continue to be applied by students, teachers, and the entire school community. Such continuous practices can foster collective awareness, contribute to maintaining environmental cleanliness, and provide long-term benefits not only for the school but also for the surrounding community.

Waste management remains a serious problem, particularly in rural areas, which generally have relatively low levels of environmental awareness. Inorganic waste such as plastic, glass, and aluminum is a major concern because it takes hundreds of years to decompose naturally. This situation poses potential long-term environmental hazards, including soil and water pollution, and ecosystem disruption. Therefore, effective educational efforts are needed to raise public awareness of waste issues. This community service activity was carried out in Sarah Perlak Village, Sungai Mas District, West Aceh Regency. The focus of the activity was the installation of educational signs containing information about the decomposition time of various types of waste. Implementation methods included direct observation to identify specific problems at the site, informal outreach to local residents, demonstrations related to waste sorting, and the creation and installation of educational signs. The signs were made from wooden planks and decorated with real waste such as plastic bottles, aluminum cans, and used paper, thus providing a tangible visualization to the community. The results of the activity showed that the visual approach through educational signs was able to attract the attention of residents, both children and adults. The information was presented clearly and accompanied by real-life examples, making the message easier to understand and remember. In addition, direct interaction through outreach and demonstrations provided an opportunity for residents to ask questions and share experiences related to waste management. Overall, this educational medium has proven effective in conveying environmental messages, raising awareness, and motivating the community to start sorting and reducing waste at the source. Going forward, this program is planned to be expanded through training in processing waste into useful products, thereby not only reducing pollution but also providing economic benefits to the community.

This research aims to develop liquid organic fertilizer (LOF) made from goat livestock waste and paitan (Tithonia diversifolia) conducted in Makale, Tana Toraja Regency, from March to June 2025. This study aims to determine the response of cucumber plants to the application of LOF derived from the combination of goat livestock waste and paitan plants. Goat livestock waste contains macro nutrients such as nitrogen (N), phosphorus (P), and potassium (K), while paitan plants are green organic materials rich in nutrients and easily decomposed. The combination of both is expected to naturally improve soil fertility and optimally support the growth and yield of cucumber plants. The research method uses a Completely Randomized Design (CRD) with four different LOF concentration treatments and five replications. Parameters observed include plant height, number of leaves, stem diameter, number of flowers, number of fruits, and fruit weight per plant. The LOF production process is carried out through fermentation for 21 days with a ratio of goat livestock waste and paitan of 3:1, and the addition of EM4 as a microorganism activator. This research also aims to evaluate the effectiveness of LOF application on growth parameters (plant height, number of leaves) and yield (number and weight of fruits) of cucumber plants, and compare it with treatments without LOF or with inorganic fertilizers. The results of this research are expected to serve as a reference for local farmers in developing organic fertilizers based on local resources that are environmentally friendly, efficient, and sustainable to increase agricultural productivity in the Tana Toraja region.

A landslide that occurred on May 24, 2024, in Pekon Datarajan, Ulubelu District, Tanggamus, Lampung, caused significant disruption to provincial road access and resulted in material losses. This study aims to assess the post-failure slope stability through field geotechnical investigation and numerical analysis using the Limit Equilibrium Method (LEM), and to propose immediate countermeasures. The slope materials consist of MH (inorganic silt) and ML (elastic silt) with high moisture content and moderate to high swelling potential. The lithology is dominated by montmorillonite clay, which has hygroscopic characteristics, making it highly vulnerable to water infiltration that reduces shear strength and increases the risk of slope failure. Stability analysis indicates a post-failure factor of safety (FoS) of 1.36 (static loading) and 1.03 (dynamic loading), which decreases to 1.07 beneath raised groundwater conditions. Recommended immediate mitigation includes surface runoff control, the construction of impermeable drainage systems, the sealing of cracks using impermeable materials, and the installation of temporary slope reinforcements such as sheet piles. The implementation of these measures increased the FoS to 1.61 (static loading) and 1.16 (dynamic loading). This study provides a technical basis for the rapid and effective mitigation of landslides in areas with similar geological and hydrological conditions.

This study aims to find the most dominant type of waste that damages the coastal area of ​​Putra Deli Beach, Deli Serdang Regency. Based on field observations and interviews with local people, it was found that inorganic, including plastic, is the type of waste that damages the coastal environment the most. Plastic waste persists such as beverage bottles, plastic bags, styrofoam, and food wrappers which are dominant because they do not decompose quickly. This condition is exacerbated by the low public awareness in maintaining cleanliness and the lack of adequate waste management facilities. The impact is not only visually polluting the environment, but also threatening the marine ecosystem, public health, and reducing the value of local tourism. The results of this study are expected to be the basis for mitigation efforts and improving waste management in coastal areas.

The Community Service Program (KKN) of the Faculty of Economics, UNKRIS, aims to raise awareness and change behavior among the community in Pondokgede sub-district regarding the environment, starting with the household environment in handling organic and inorganic waste through composting and the use of Biopori Infiltration Pits (LRB), waste banks, and greening for Green Open Spaces (RTH). The method used in this study is qualitative analysis. Before the KKN FE UNKRIS activities were implemented, several steps were taken to ensure the smoothness and effectiveness of the program, including preparation, implementation, and evaluation. Overall, the KKN FE UNKRIS program in the environmental conservation movement and its implementation in Pondokgede sub-district has had a positive impact on accelerating the development of Pondokgede sub-district, as evidenced by the improvement in community behavior toward the environment and the level of community satisfaction with the KKN FE UNKRIS program. The implications of this KKN program include the need for continuous monitoring to ensure that community awareness of a clean and healthy environment continues to increase. Additionally, the program should be continued until the stage of utilizing the results of waste processing generated by each community in Pondokgede.

Fertilization is one of the important activities in plant cultivation because it plays a role in increasing productivity by maintaining soil fertility. This experiment aimed to test the effectiveness of NPK fertilizer (20-51-13) on the growth and production of cabbage plants and its agronomic effectiveness. The experimental design used was a randomized block design. The treatments tested: without application of the tested fertilizer (P0), application of inorganic fertilizer comparison (2 kg/ha/application) (P1), and 5 levels of NPK fertilizer (20-51-13) tested, namely: 1.0, 1.5, 2.0, 2.5, and 3.0 kg/ha/application. The recommended doses of urea, SP-36, and KCl fertilizers were  200, 100, and 100 kg/ha, respectively. The results showed that the application of NPK fertilizer (20-51-13) can increase the growth of cabbage plants as indicated by the variables of plant height and number of cabbage leaves compared to the control treatment. In addition, the application of NPK fertilizer (20-51-13) increased the yield components of cabbage plants compared to the control treatment. The treatment of 0.75 doses of NPK fertilizer (20-51-13) was agronomically effective because it produced the highest relative agronomic effectiveness value of 145%, which means it can increase yields by 1.45 times. The recommended dose for cabbage plants is 1.5 kg/ha/application of NPK fertilizer (20-51-13) applied 5 times at 2, 3, 4, 5, and 6 WAP.

This study aimed to evaluate the effect of compost fertilizer and potassium chloride (KCl) fertilizer, as well as their interaction, on the growth and yield of sweet corn (Zea mays saccharata Sturt). The experiment was conducted from May to August 2022 in Kuning Village, Bambel District, Southeast Aceh, using a factorial randomized block design with two factors: compost dosage (480 g/plot, 960 g/plot, 1,440 g/plot) and KCl dosage (20 g/plot, 40 g/plot, 60 g/plot), each replicated three times for a total of 27 plots. Observed parameters included plant height, stem diameter, leaf area, days to flowering, ear length, and ear weight per plot. Results indicated that compost and KCl fertilizers significantly affected plant height, leaf area, days to flowering, and ear length, but had no significant effect on stem diameter or ear weight per plot. The interaction between compost and KCl produced the highest plant height (165.89 cm) and ear length (21.69 cm) in treatment K3C1. The findings suggest that optimal fertilization using compost and KCl can enhance sweet corn productivity by improving vegetative growth and reproductive development. Nevertheless, the absence of significant effects on stem diameter and ear weight per plot indicates that nutrient balance, especially nitrogen (N) and phosphorus (P), remains crucial for maximizing yields. Therefore, integrating compost and KCl with complementary sources of macronutrients could promote more consistent outcomes. This research also highlights the role of organic matter in enriching soil fertility, maintaining soil structure, and supporting sustainable agriculture. The combination of organic and inorganic fertilizers demonstrates the potential for eco-friendly crop management practices that balance productivity with environmental responsibility. These results provide valuable insights for farmers, agronomists, and policymakers in developing efficient fertilization strategies for sweet corn cultivation within local conditions.

The Jelekong landfill was a temporary landfill site following a landslide at the Leuwigajah landfill. TPA Jelekong was officially closed at the end of 2005 because it was no longer able to accommodate the increasing volume of waste. However, the impact of activities from the former landfill still has the potential to pollute the environment, especially groundwater sources. The research aimed to identify the physical and chemical parameters of water in the Jelekong ex-landfill case study area and the surrounding area, and to compare the physical and chemical parameters of water between the Jelekong ex-landfill and the landfill that is still operating (Sarimukti landfill). Data were obtained from 4 water sample points and tested using several test methods, namely Inductively Coupled Plasma Mass Spectrometry (ICP-MS), Ion Chromatography (IC), alkalinity, and stable water isotopes. The results showed that the physical characteristics of the Jelekong area generally have a neutral pH with one point having an alkaline pH (JL-02) due to interaction with andesite lithology and the highest DO concentration at point JL-02. While the Sarimukti landfill has a pH value of 7.89-8.27 indicating the result of high bicarbonate concentrations, the TDS value of 15700-18200 ppm indicates the large number of ions and solutes derived from organic and inorganic waste. Piper diagrams show two water facies in the Jelekong area, Ca-HCO3 and Na-HCO3. Sample JL-03 indicates a mixture with landfill leachate due to high Cl and SO4 concentrations. Sample JL-01 still indicates leachate because when compared to the sarimukti sample, the Cl and SO4 concentrations are still quite high indicating a result of both organic and inorganic waste. Stable isotope test results indicated that the water was derived from local precipitation.

Bandung Regency, which is experiencing overcapacity in landfills, has implemented a waste management solution involving the separation of organic and inorganic waste. Inorganic waste, which is notoriously difficult to decompose, has prompted the Bandung Regency government to adopt a community-focused approach to waste management, establishing waste banks in school-age communities. However, the project has encountered challenges, as evidenced by the fact that some schools have implemented waste banks but have not been actively engaged in their operations. This has led to the project's suboptimal implementation in Bandung Regency schools.The objective of this study is to identify the challenges associated with the inactivity of waste banks in Bandung Regency schools, as perceived by students and administrators.The study utilises the triple drivers of ecopreneurship, focusing on the economic, social, and environmental benefits of school waste banks. This research employs a mixed methods approach, utilising both quantitative and qualitative data collection methods. The quantitative approach involves the administration of surveys to students, followed by data processing using descriptive statistics. The qualitative method involves conducting interviews with administrators, and the data is processed using the Miles and Huberman model. The findings of the research indicate that the implementation of a waste bank for the management of inorganic waste in a school environment is positively received by the school, despite the presence of obstacles related to waste collection sites, socialisation among students, and differences between administrators and students regarding the most significant focus or choice for implementing waste banks in schools.It is anticipated that the research results will contribute to the understanding of inorganic waste management in waste banks that are less active in the school environment. The study thus recommends further research in schools that are routine or active in waste bank implementation activities, with a view to describing overall information about the implementation of school waste banks, especially in schools in Bandung Regency with school waste bank projects.

Increasing community literacy in environmental management is a strategic step to realize sustainable development. One practical approach that can be implemented is through community-based education. This article examines how local communities can become agents of change in increasing public awareness and understanding regarding environmental issues, such as waste management, natural resource conservation, and adaptation to climate change. Through a participatory approach, community-based education encourages direct community involvement in designing and implementing environmental programs that suit local needs. Case studies from various regions show that collaboration between communities, government, and the private sector can increase the effectiveness of educational programs and create long-term impacts. The work programs are processing organic and inorganic waste, processing agricultural land, planting trees, preventing dengue fever and making anti-mosquito spray, providing information related to Hoaxes and phishing link modes, and collecting data on MSMEs. Apart from that, there are also work programs regarding learning posts, introducing waste banks, making street signs, and creating village websites. The results obtained from this activity are an approach to the community through social activities carried out with residents and increasing community insight through the outreach and training programs provided. Apart from that, village facilities can be improved by creating street signs and village websites. It is hoped that the results of this study can become a practical guide in developing a sustainable community-based education model for environmental management.

Minerals are solid objects that can be found in nature, formed inorganically, with chemical composition at certain limits and have atoms arranged regularly. Rocks can be distinguished based on the formation process and mineral content. The purpose of this study is to identify minerals in sedimentary rocks and laterite deposits in this study used analytical methods, namely Binocular Microscope and XRD (X-Ray Diffraction) laboratory tests. XRD analysis is used to determine the type of mineral in the sample. Based on the results of the XRD X-Ray Diffraction lab test, each sample has a different mineral content.