Archives

  • Jurnal Ilmiah Pertanian
    Vol. 22 No. 3 (2025)

    Jurnal Ilmiah Pertanian Volume 22 Issue 3 (2025) features six peer-reviewed articles addressing key themes in contemporary agricultural science, including crop protection, sustainable production systems, agro-industrial innovation, value chain analysis, and risk management in tropical and smallholder-based agriculture. The contributions combine experimental studies, field evaluations, socio-economic analyses, and conceptual perspectives to respond to practical and systemic challenges in developing agricultural regions. This issue includes studies on the in vitro antifungal activity of plant-derived acetogenin–curcumin extracts against Fusarium spp., the growth response of pakchoi (Brassica rapa L.) to bio-slurry liquid organic fertilizer intervals, and crop improvement through putative polyploid induction in emprit ginger for bacterial wilt suppression. An integrated production risk analysis of clove plantations in West Sumatra further highlights multidimensional challenges in commodity-based farming systems.

    In addition, the issue presents an agro-industrial study on the valorization of pineapple peel waste into nata de pina, demonstrating opportunities for value addition and circular economy practices. A perspective article on sweet potato (Ipomoea batatas) value chains in smallholder systems broadens the scope by examining structural and institutional constraints affecting coordination, inclusiveness, and value creation. Through its diverse contributions, this issue emphasizes applied innovation, sustainability, and interdisciplinary thinking in support of resilient and responsible agricultural systems.

  • Jurnal Ilmiah Pertanian
    Vol. 22 No. 2 (2025)

    The Jurnal Ilmiah Pertanian Vol. 22, Issue 2, 2025 presents a collection of original research articles that highlight scientific advancements and local resource valorization across various domains of agricultural science. The cover of this issue features semaung, a lesser-known indigenous fruit from Riau, Indonesia, traditionally used in the preparation of cangkuok semaung, a naturally fermented food. This visual element is directly connected to one of the featured studies in this issue, which explores the isolation and antimicrobial properties of lactic acid bacteria derived from this traditional fermented product. The research underscores the relevance of local biodiversity and indigenous knowledge in developing functional foods and probiotics with potential health-promoting applications. 

    This issue also includes a diverse range of studies representing innovations in sustainable agriculture, biofertilizer development, plant protection, and agro-based bioproducts. One article employs microwave-assisted extraction combined with computational modeling to optimize the isolation of curcumin from Curcuma longa, offering insights into its potential application as a natural sunscreen agent. Another study investigates the effects of leachate-derived liquid organic fertilizer on chili growth and soil fertility in biochar-amended marginal soils, contributing to efforts in rehabilitating degraded land using organic inputs. Further research presented in this volume addresses the identification of dominant genera of plant-parasitic nematodes in Musa acuminata x balbisiana (kepok banana) cultivation areas in Pidie, Indonesia—providing essential baseline data for integrated pest management strategies. A study on dietary supplementation in quails explores the effects of Sardinella lemuru fish oil on egg production and fatty acid profiles, aiming to enhance nutritional outcomes in smallholder poultry systems. Additionally, the issue features work on the productivity and genetic diversity of elite sugarcane clones cultivated under dryland grumusol soils, which holds implications for sugarcane breeding in suboptimal environments. 

    Through this issue, Jurnal Ilmiah Pertanian continues its commitment to disseminating high-quality research that bridges scientific rigor with practical relevance. The integration of local food systems, sustainable inputs, and genetic resource development reflects the journal’s vision to support resilient agricultural innovations grounded in both ecological knowledge and scientific inquiry.

  • Jurnal Ilmiah Pertanian
    Vol. 22 No. 1 (2025)

    The March 2025 issue of Jurnal Ilmiah Pertanian (Vol. 22, No. 1) features five original research articles that offer fresh perspectives and evidence-based innovations across agro-industrial technology, plant protection, and sustainable agriculture. The cover of this edition showcases the macroscopic morphology of single colonies of endophytic bacteria isolated from Mimosa pudica roots—specifically highlighting isolate BEP5—originating from the third article in this volume, which explores biological control strategies against banana Fusarium wilt. The issue opens with a study on optimizing roasting conditions for avocado seed flour (Persea americana Mill.), a promising functional ingredient derived from agro-waste. By testing four different roasting temperatures, the researchers identified 150°C as optimal, significantly enhancing flour quality by reducing moisture and tannin levels while preserving nutritional composition.

    The second article investigates the production and application of coconut shell-derived liquid smoke as a natural food preservative. The study demonstrates its effective antimicrobial activity, particularly at a 7% concentration, making it a viable substitute for synthetic preservatives in processed fish products like fish balls. The third article, which contributes the cover image, examines the in vitro antagonistic activity of endophytic bacteria BEP8 and BEP15 isolated from Mimosa pudica against Fusarium oxysporum f. sp. cubense. Both isolates significantly inhibited fungal growth in dual culture assays, highlighting their potential as environmentally friendly biocontrol agents for banana disease management. Focusing on environmental rehabilitation, the fourth article evaluates the phytoremediation capacities of three mangrove species—Avicennia marina, Rhizophora mucronata, and Bruguiera gymnorrhiza—in Pb-contaminated urban coastal areas of Surabaya, Indonesia. Each species exhibited distinct metal accumulation and translocation patterns, offering species-specific insights for future coastal restoration strategies. The final article assesses agronomic performance and sugar yield potential in seven promising sugarcane clones during their second ratoon cycle. Significant differences were found among clones for key yield-related traits, with two genotypes demonstrating superior performance and heritability, reinforcing their potential for variety release. Altogether, this edition underscores the journal’s mission to disseminate applied agricultural research that promotes sustainability, innovation, and environmental resilience in tropical farming systems.

  • Jurnal Ilmiah Pertanian
    Vol. 21 No. 3 (2024)

    The Jurnal Ilmiah Pertanian (JIP) is pleased to present its December 2024 issue, showcasing cutting-edge research and advancements in agricultural science. This issue explores a diverse range of topics, including studies on pest management through morphological and molecular characterization, which provide valuable insights into effective control strategies for crops. Research on the impact of planthopper infestations highlights the significance of integrated pest management, especially for underutilized species, while other studies focus on enhancing crop production using innovative approaches such as plant growth-promoting rhizobacteria.

    Further contributions in this issue include investigations into the functional benefits of chia seeds for cholesterol reduction in poultry, adding a novel perspective to functional feeds. The effects of photoperiod on the growth stages of agricultural pests are also explored, offering practical implications for pest control in varying climatic conditions. Research on sugarcane cultivation demonstrates the impact of liquid inorganic fertilizers on improving crop growth, while studies on ginger-based plant growth-promoting rhizobacteria emphasize sustainable biological control practices against plant pathogens. Finally, this issue addresses entrepreneurial challenges in agriculture, examining the business management factors that influence the success of young agricultural startups. Collectively, these studies contribute to advancing sustainable agricultural practices, improving crop productivity, and addressing critical challenges faced by the agricultural community. We trust this issue will inspire further research and innovation in the field of agriculture.

  • Jurnal Ilmiah Pertanian
    Vol. 21 No. 2 (2024)

    The Journal Ilmiah Pertanian (JIP) is a peer-reviewed, open-access journal that publishes original research articles on agricultural advances for global dissemination. It serves as a platform for researchers and academics to share their findings and innovative approaches in agriculture. In this issue, we published nine articles, featuring research from authors in Indonesia and Germany. The articles explore a range of topics, including the combinatory effects of organic fertilizers and biochar on melon growth, and the impact of cutting types and plant growth regulators on the propagation of red star begonia. Another study optimizes winged-bean meal through different heating methods as a viable alternative for plant-based aquafeed. Research on ginger investigates the morphological and biochemical identification of bacterial strains causing wilt disease. Soil morphological characteristics in the volcanic toposequence zone at Tangkuban Parahu volcano are also examined. The issue includes a study on optimizing water balance for strategic planting patterns in paddy cultivation in rainfed regions and another on phytoremediation of iron-contaminated soils using humic acid and hyperaccumulator grasses. The efficacy of neem and basil leaf extracts in controlling whitefly infestations and enhancing the yield of curly red chili peppers is also explored. Finally, an article characterizes the agronomic, morphological, nutritional, and phytochemical traits of local sorghum in Indonesia. We hope this issue provides valuable insights and inspires further research in agricultural science.

  • Jurnal Ilmiah Pertanian
    Vol. 21 No. 1 (2024)

    Jurnal Ilmiah Pertanian is pleased to present Vol. 21, No. 1, of our esteemed journal for the year 2024. This issue encompasses a diverse array of research contributions from esteemed scholars in the fields of agriculture and related sciences. The articles featured herein reflect a blend of insightful investigations and innovative methodologies, highlighting the multifaceted nature of contemporary agricultural research. The first article, titled "Study on Medicinal Forest Plants in Ifo, Ogun State, Nigeria, and Factors Shaping Usage Patterns," delves into the exploration of medicinal plants within the rich ecosystem of Ifo, Ogun State, Nigeria. This study offers valuable insights into the utilization patterns of these plants, shedding light on the socio-cultural and environmental factors influencing their usage. Next, "Updates on hosts and distribution of pepper yellow leaf curl Indonesia virus and squash leaf curl China virus in Central Java Province, Indonesia" provides a comprehensive update on the hosts and distribution patterns of two significant plant viruses within Central Java Province, Indonesia. This research contributes to the understanding of viral epidemiology and its implications for agricultural management practices. The third article, "Combination of thidiazuron and basal media type on optimizing in vitro growth of Grammatophyllum stapeliiflorum orchids," presents findings on the optimization of in vitro growth conditions for Grammatophyllum stapeliiflorum orchids. By exploring the effects of thidiazuron and basal media types, this study offers practical insights for orchid propagation techniques. Furthermore, "Landslide hazard assessment and agricultural vulnerability using a geospatial approach" investigates the application of geospatial techniques for landslide hazard assessment and its implications for agricultural vulnerability. This interdisciplinary research bridges the fields of geoscience and agriculture, offering a holistic perspective on disaster risk management. Lastly, "Characterization of composting process and chemical composition of compost from recycling centers in Surabaya City, Indonesia" presents a detailed characterization of the composting process and chemical composition of compost derived from recycling centers in Surabaya City, Indonesia. This study contributes to the advancement of sustainable waste management practices and agricultural resource utilization. Collectively, the articles featured in this volume exemplify the dedication of scholars from diverse backgrounds to address pressing issues in agriculture and allied sciences. We extend our gratitude to the authors for their invaluable contributions and to the reviewers for their meticulous evaluation, which has ensured the quality and rigor of the published research. We trust that these scholarly endeavors will inspire further exploration and innovation in the field of agriculture.

  • Jurnal Ilmiah Pertanian
    Vol. 20 No. 3 (2023)

    Jurnal Ilmiah Pertanian (JIP) is a peer-reviewed, open-access journal that publishes original research articles on agricultural advances and local land resources for global dissemination. It serves as a platform for researchers and academics to share their findings, methodologies, and innovative approaches in agriculture. In the latest edition, a diverse array of research articles has been presented, offering innovative insights and discoveries in agricultural sciences. The contributing authors, hailing from Indonesia, Egypt, and Japan, collectively enrich the journal with their expertise and diverse perspectives. The published studies cover a wide spectrum of agricultural topics, exemplifying the global nature of agricultural research. Among the featured articles is groundbreaking research introducing an automated rhinoceros beetle control method in oil palm replanting, utilizing a pheromone trap derived from pineapple peels. Additionally, researchers explore the potential of 6-benzylaminopurine in inducing in vitro shoot formation from tembesu (Fagraea fragrans Roxb) petiole explants. Another article presents a comparative analysis of pesticide residue profiles in locally grown rice, shedding light on differences between conventional and sustainable agricultural methods. Further contributions include investigations into the resistance of cayenne pepper varieties to anthracnose disease, the enhancement of strawberry yield and sweetness using humic substances and biofertilizer, and optimal growth conditions for avocado seedlings using a biofertilizer-based approach. The collaborative efforts of researchers from Indonesia, Egypt, and Japan underscore the global relevance of these studies, emphasizing the interconnectedness of agricultural challenges and the need for international cooperation in advancing the field. Collectively, these articles significantly contribute to the expanding body of knowledge in agricultural sciences, addressing key issues and paving the way for future advancements in sustainable and effective agricultural practices.

  • Jurnal Ilmiah Pertanian
    Vol. 20 No. 2 (2023)

    Jurnal Ilmiah Pertanian (JIP) is a peer-reviewed, open-access journal that publishes original research articles on agricultural advances and local land resources for global dissemination. It serves as a platform for researchers and academics to share their findings, methodologies, and innovative approaches in agriculture. In this issue, we published nine articles that consist of 3 Short Communications and 6 Research Articles. For the Short Communications: First, the article explores the effectiveness of indigenous Rhizobium sp. isolates obtained from peatland soils in promoting the growth and production of soybean plants. Second, the article focuses on the suppression of Xanthomonas oryzae pv. oryzae, a bacterial pathogen that causes a devastating disease called bacterial blight in rice plants. Thirth, the article investigates the use of covering materials during the acclimatization process of Mucuna bracteata D.C., a legume plant species with significant agricultural potential. The Research Article: first, the article focuses on improving tomato production in dryland environments by applying bio-organo-mineral fertilizers. Second, the article presents a case study conducted in East Java, Indonesia, to explore the relationship between corporate social responsibility (CSR) initiatives and agricultural companies' marketing and financial performance. Thirth is a study that is a cover article in this issue. This study investigates the long-term residual effects of biochar derived from tobacco scraps on red spinach (Amaranthus tricolor) growth in Entisols, a specific type of soil. Fourth, the article focuses on determining the land suitability for sustainable cultivation practices of porang, a plant species known as Amorphophallus oncophyllus L., in Pasuruan Regency, Indonesia. Fifth, the article investigates using biochar and clay to enhance the chemical quality of sandy-textured soil and improve shallot yields. And lastly, the article focuses on assessing the genetic diversity, heritability, and productivity of new sugarcane clones in paddy fields in Indonesia.

     

     

  • Jurnal Ilmiah Pertanian
    Vol. 20 No. 1 (2023)

    Jurnal Ilmiah Pertanian (JIP) is a peer-reviewed, open-access journal that publishes original research articles on agricultural advances and local land resources for global dissemination. In this issue, we have published ten articles rigorously selected by competent reviewers in their respective fields. The cover article presents research on identifying arbuscular mycorrhizal fungi (AMF) associated with cassava in six locations in the Manokwari Regency, West Papua, Indonesia (1 article). Additionally, there are articles on the detection and identification of beetle pests in rice warehouses in Mataram City and Central Lombok Regency (1 article), and also the detection of P. manshurica fungus and analysis of the viability and growth of P. manshurica oospores in soybean storage warehouses in Ternate City (1 article), and computational studies predicting chemical compounds that can be used as sunscreens from the kencur plant (1 article). This issue also features a review article that discusses the capability of agricultural land to produce rice as a staple food crop in Situbondo Regency, as well as a research article on determining the actual and potential land suitability classes for porang land in Madiun Regency, Indonesia. The exploration of papaya fermentation in producing sourdough and its potential as a promising quality sourdough donut is also discussed. Two other articles investigate the performance of field agricultural officers in women's farming groups (1 article) and the factors that influence their performance from a personal, competency, and motivation perspective (1 article) in Luwu Regency, South Sulawesi, Indonesia. Finally, the last article discusses the effect of adding turmeric powder and nitrification probiotics on the productivity and amount of ammonia produced from quail manure.

  • Jurnal Ilmiah Pertanian
    Vol. 19 No. 3 (2022)

    Jurnal Ilmiah Pertanian Volume 19 Issue 3 (2022) presents research articles that focus on plant health, seed physiology, crop improvement, and environmental quality within tropical agricultural systems. The contributions in this issue reflect experimental, laboratory-based, and field-oriented approaches to understanding biological interactions, seed performance, and environmental pressures affecting crop production. Plant disease dynamics are addressed through a short communication reporting the co-infection of two Ganoderma boninense strains on oil palm seedlings. This study provides insights into pathogen interactions that may influence disease severity and management strategies in oil palm nurseries. Environmental dimensions of agriculture are examined in a study assessing heavy metal contamination in the soil–water–rice system near coal-fired power plants in Cilacap, Indonesia, highlighting potential implications for agroecosystem health and food safety.

    A substantial portion of this issue is devoted to seed germination, early growth responses, and selection processes. One article evaluates the effects of natural plant hormones and seed soaking duration on the germination, growth, and yield of expired red chili (Capsicum annuum L.) seeds, offering perspectives on improving seed viability. Another study examines genetic diversity and selection progress in F6 generations of long bean (Vigna unguiculata (L.)), based on agronomic traits relevant to crop improvement efforts. Methodological aspects of seed testing and propagation are further explored through research optimizing germination testing methods and planting media for Artemisia annua L. seeds, as well as a study investigating the germination and early growth responses of teak (Tectona grandis Linn. f.) seeds under different concentrations and soaking durations in hydrochloric acid. These contributions provide practical references for seed technology, nursery management, and propagation practices.

    Collectively, the studies presented in this issue highlight complementary perspectives on plant pathology, environmental assessment, seed science, and crop improvement, reinforcing the role of experimental evidence and applied methodologies in supporting resilient and sustainable agricultural production systems.

  • Jurnal Ilmiah Pertanian
    Vol. 19 No. 2 (2022)

    Jurnal Ilmiah Pertanian Volume 19 Issue 2 (2022) presents original research articles that emphasize plant disease management, soil and environmental remediation, agricultural biotechnology, resource recycling, and socio-institutional aspects of agricultural development. The studies in this issue reflect a strong integration of biological, environmental, and socio-economic approaches to address challenges in tropical agriculture and plantation systems. Plant protection and biological control constitute a major theme in this issue. Two articles focus on Trichoderma spp. isolated from oil palm tissues and rhizosphere soils in peatland environments, examining their morphological and molecular characteristics as well as their potential as biological control agents against Ganoderma boninense. These studies contribute to the development of sustainable disease management strategies for oil palm plantations. Complementing this theme, another article reports the isolation, characterization, and pH stability testing of bacteriophages targeting Xanthomonas oryzae, highlighting alternative biological approaches for controlling bacterial diseases in paddy fields.

    Soil management and environmental applications are addressed through research on soil renewal and the removal of metal ion pollutants from water using volcanic ash derived from eruptions of Mount Sinabung and Mount Merapi. This study demonstrates the potential of natural mineral materials for soil rehabilitation and water treatment. Another contribution evaluates the use of liquid organic waste from palm oil mills and tofu industries to improve physicochemical properties and carbon stocks of Haplustepts soils, highlighting waste recycling as a strategy to enhance soil quality and carbon sequestration. Beyond biophysical research, socio-economic and institutional dimensions are represented in a study examining strategies to strengthen social capital within geographical indication protection communities for Arabica coffee in South Tapanuli Regency. This article provides insights into collective action and institutional strengthening for sustainable commodity development. Genetic diversity and crop improvement are further explored through an analysis of agronomic trait-based diversity and kinship relationships among colored maize (Zea mays L.) varieties, contributing to the understanding of local germplasm characterization.

    Together, the articles in Jurnal Ilmiah Pertanian Volume 19 Issue 2 (2022) illustrate the breadth of research addressing biological control, soil and environmental sustainability, agricultural waste utilization, institutional development, and crop diversity within tropical agricultural systems.

  • Jurnal Ilmiah Pertanian
    Vol. 19 No. 1 (2022)

    Jurnal Ilmiah Pertanian Volume 19 Issue 1 (2022) presents original research articles that highlight the integration of digital technology, bioenergy development, plant biotechnology, botanical-based inputs, and socio-economic analysis within agricultural and fisheries systems. The articles in this issue reflect the growing application of interdisciplinary approaches to address productivity, sustainability, and livelihood challenges in tropical agriculture. Advances in digital agriculture are represented through a study on the design of a disease identification system for oil palm (Elaeis guineensis Jacq.) leaves using deep learning convolutional neural networks. This article demonstrates the potential of artificial intelligence to support early disease detection and decision-making in plantation management. Energy innovation is addressed in a study on the production of bio-briquettes from biochar pyrolysis products of oil palm shells, highlighting the utilization of agricultural waste as an alternative renewable energy source.

    Plant growth and development under controlled and applied conditions are examined in two articles. One study evaluates the use of potato boiling water in Murashige–Skoog media to enhance the in vitro growth of protocorms of Grammatophyllum stapeliiflorum, providing insights into low-cost alternatives for plant tissue culture. Another article investigates the application of tapak dara (Catharanthus roseus L.) leaf extract on the growth and morphological characteristics of leek (Allium fistulosum L.), contributing to the development of plant-based growth regulators in sustainable crop production. Socio-economic dimensions of primary livelihoods are explored through a case study analyzing the contribution of alternative income sources to household earnings among fishing communities in Bagan Hulu, Rokan Hilir Regency, Indonesia. This article highlights livelihood diversification as a strategy to enhance household resilience in coastal areas.

    Together, the articles in Jurnal Ilmiah Pertanian Volume 19 Issue 1 (2022) illustrate the convergence of technological innovation, biological experimentation, resource utilization, and socio-economic analysis in addressing contemporary challenges in agriculture and fisheries.

  • Jurnal Ilmiah Pertanian
    Vol. 18 No. 1 (2021)

    Jurnal Ilmiah Pertanian Volume 18 Issue 1 (2021) presents original research articles that examine agricultural systems from multidisciplinary perspectives, encompassing occupational health and safety, agroecology, socio-economic conditions, land resource management, and food consumption behavior. The articles in this issue reflect the journal’s broad scope in agriculture, fisheries, and applied sciences, with a particular focus on human, ecological, and production-related dimensions in tropical and coastal regions of Indonesia. One contribution addresses occupational health and safety in agriculture through an analysis of working postures among oyster mushroom farmers in East Kalimantan using the Ovako Working Posture Analysis System (OWAS). This study highlights ergonomic risks faced by small-scale farmers and provides evidence-based insights for improving labor conditions in agricultural production systems. Complementing the human-centered perspective, another article inventories refugia plants with potential medicinal properties in agricultural landscapes in East Java, emphasizing biodiversity conservation and the multifunctional role of non-crop vegetation in agroecosystems.

    Socio-economic aspects of primary production are explored through a case study of small-scale traditional fishermen in Payum Village, Merauke District, Papua. This article examines livelihood conditions, resource dependence, and socio-economic challenges faced by coastal communities. Production and land resource issues are further addressed in a study analyzing land carrying capacity and production factors influencing cocoa (Theobroma cacao L.) cultivation in Banggai Regency, providing insights into sustainable land use and regional commodity development. The issue also includes a study on community consumption behavior related to sago-based food products in Pekanbaru, Indonesia. This article contributes to the understanding of local food systems, dietary preferences, and the cultural significance of indigenous carbohydrate sources within urban and peri-urban contexts.

    Taken together, the articles in Jurnal Ilmiah Pertanian Volume 18 Issue 1 (2021) demonstrate the integration of technical, ecological, and socio-economic analyses in addressing challenges and opportunities within agricultural and fisheries systems in Indonesia.

  • Jurnal Ilmiah Pertanian
    Vol. 17 No. 2 (2021)

    Jurnal Ilmiah Pertanian Volume 17 Issue 2 (2021) features original research articles that examine sustainable crop production, soil–plant interactions, biological inputs, postharvest quality, and agro-industrial waste utilization in tropical agricultural systems. The articles in this issue focus on environmentally sound management practices, particularly the application of organic amendments, biofertilizers, and biological agents to improve crop performance and resource use efficiency. Several contributions investigate crop growth responses under different soil and fertilization regimes. One study evaluates paddy performance in swampland ecosystems using organic pellet fertilizers derived from Azolla and vermicompost, highlighting their role in supporting rice cultivation in marginal environments. Other studies examine celery (Apium graveolens L.) growth in red-yellow podzolic soils inoculated with earthworms (Pontoscolex corethrurus) and maize root development under N, P, and K fertilization monitored through rhizotron observation, providing insights into root dynamics and nutrient availability.

    The influence of microbial-based inputs is addressed through research on exopolysaccharide-producing Azotobacter combined with cow manure, which assesses nutrient uptake and root-to-shoot ratio in sorghum. This study emphasizes the contribution of beneficial microorganisms and organic matter to plant nutrient acquisition and biomass allocation. Postharvest management and agro-industrial innovation are also represented in this issue. An investigation of Bulog rice storage piles evaluates their effects on rice weevil (Sitophilus oryzae L.) populations and rice quality during storage in Jayawijaya Regency, offering implications for improving grain storage practices. In addition, an agro-industrial study explores the production of nata de cassava from tapioca wastewater using different natural nitrogen sources, demonstrating the potential of agro-industrial by-products as raw materials for value-added food products.

    Together, the articles in Jurnal Ilmiah Pertanian Volume 17 Issue 2 (2021) illustrate the diversity of research approaches addressing soil fertility, crop productivity, postharvest quality, and waste valorization within tropical agriculture.

1-14 of 40