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Open research questions in Soil and Land Suitability Analysis

176 gap statements mined from Soil and Land Suitability Analysis papers in our 7.9M-paper local library, which holds 599 papers on the topic — drawn mostly from each paper's own stated research gap, future-work, challenge and limitation notes, and its abstract. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one.

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What the literature leaves open

  • There is a gap in understanding the relationship between soil fertility and rice suitability. The paper identifies a need to integrate soil, hydrological, and terrain controls in land evaluation. The study highlights the limitations of prior work in addressing the complexity of floodplain agroecosystems.

    Remote sensing-driven soil fertility modelling and summer rice suitability mapping in a floodplain agroecosystem of Assam · 2026 · DOI

  • The study identifies the need for land-use strategies that harmonize environmental conservation with socio-economic development in the Himalayan region. There is a gap in identifying areas where agroforestry can be most effectively implemented in Himachal Pradesh.

    Suitability analysis of agroforestry in Himachal Pradesh by using a multi-criteria GIS–AHP approach · 2026 · DOI

  • It highlights the need to address region-specific constraints and opportunities. The study identifies the importance of strengthening institutional support systems and promoting awareness among farmers.

    Agroforestry in India: review of strategic models, suitability assessment and adoption across agro-ecological regions · 2026 · DOI

  • The lack of a hybrid approach combining expert knowledge and machine learning for agroforestry suitability assessment. The need for a spatially explicit framework for agroforestry planning and management zoning. The requirement for a more accurate and reliable method for identifying areas suitable for agroforestry.

    Agroforestry suitability and management zoning in the northwestern Himalayas using hybrid expert and machine-learning approaches · 2026 · DOI

  • To address this gap, future research could explore how geographically specific factors can be systematically integrated into regional policy planning. Importantly, the analysis relied primarily on static data, not because dynamic information was unavailable but because national-scale panel data remain limited; consequently, temporal changes could not be sufficiently reflected.

    Decision Support for Peri-Urban Sustainability: An AHP–EWM Based Livability Vulnerability Assessment · 2025 · DOI

  • The study notes that previous studies have used different methodologies and variables to assess land suitability. The paper highlights the need to include soil organic carbon as a critical component for soil fertility in land suitability assessments.

    Spatial Assessment of Land Suitability Potential for Agriculture in Nigeria · 2024 · DOI

  • The substantial spatial variability in plant available P across fields is not accurately revealed by current methods. There is a need for emerging sensing, data fusion, and spatial predictive modeling approaches.

    Implementation of Proximal and Remote Soil Sensing, Data Fusion and Machine Learning to Improve Phosphorus Spatial Prediction for Farms in Ontario, Canada · 2024 · DOI

  • This study does not account for these circumstances. Additionally, the study suggests conducting additional research on this subject, which might include perceptible water vapor and atmospheric dust.

    A GIS-Based Entropy–AHP Hybrid Framework for Site Suitability Assessment of Radio Astronomy Observatories in Southern Jordan · 2026 · DOI

  • The present study is limited to region-level historical data and restricted to the spatial coverage of eight selected regions of Central Karnataka.

    A Hybrid Spatiotemporal Learning for the Regional Agroclimatic Mapping and Genotypic Resilience Analysis: A Case Study of Areca Nut Yield in Central Karnataka · 2026 · DOI

  • This specific methodology proves to be particularly useful for the Greek context, where the application of similar methodologies is lacking, especially in spatial and development planning.

    Landscape Character Assessment for Sustainable Rural Development in Border Insular Areas: A Case Study of Ano Mirabello, Crete · 2025 · DOI

  • Nonetheless, several limitations remain: the model does not account for varietal differences, management practices, or irrigation conditions, and future socio-economic policies and market feedback may also influence suitability projections.

    Impacts of Future Climate and Farmland Changes on the Potential Cultivation Suitability of Apricot in China · 2025 · DOI

  • Future research should explore the integration of socio-economic and demographic factors, such as population density, income levels, and environmental justice metrics, to better align afforestation efforts with community needs.

    GIS-Based Multi-Criteria Analysis for Urban Afforestation Planning in Semi-Arid Cities · 2025 · DOI

  • These choices could help mitigate one of the key limitations identified in the evaluated methods—slow rendering performance.

    Exploring Unconventional 3D Geovisualization Methods for Land Suitability Assessment: A Case Study of Jihlava City · 2025 · DOI

  • Conversely, unsuitable cropland conditions or limited cropland area, lack of spare time, as well as low income expectations and high risk expectations, are the reasons why high part-time farmers rarely choose NGPC.

    Influencing mechanism of farmers’ willingness to non-grain production of cropland based on SOR-MOA integration model · 2026 · DOI

  • The study does not provide a comprehensive evaluation of the effectiveness of ex-situ conservation. The study is limited to Uganda and may not be generalizable to other regions.

    Land Suitability Mapping of the Most Illegally Harvested Plant Species using a GIS-based Model in Uganda · 2026 · DOI

  • There is a lack of effective decision-support tools for conservation planning in Uganda. There is a need to identify suitable habitats outside protected areas for ex-situ conservation.

    Land Suitability Mapping of the Most Illegally Harvested Plant Species using a GIS-based Model in Uganda · 2026 · DOI

  • Reliable high-resolution digital elevation model (DEM) data were limited for the study area. Parameters like aspect, altitude, and remotely sensed vegetation indices could further refine erosion hazard estimation.

    Development of erosion hazard index-based land suitability criteria for sustainable agriculture in the Nilgiris hills of India · 2026 · DOI

  • The research was not limited to the properties of the leaf tissues but also to their eventual changes in their functions; that is, the physiological parameters linked to gas exchanges were evaluated; therefore, the effect of oil accumulation in the fruit and its extra virgin oil quality could not be overlooked.

    Olive Plant Treated with Different Geo-Material Foliar Film (Zeolite and Kaolin Based): Leaf Characteristics and Oil Quality · 2025 · DOI

  • Topography is less well studied in relation to agricultural land suitability. Most agricultural land suitability research focuses on climate and soil features, neglecting topography.

    Evaluating the Topographic Factors for Land Suitability Mapping of Specialty Crops in Southern Ontario · 2024 · DOI

  • This model effectively balances the objectivity of expert judgment and data-driven methods, and is a universal approach that is not limited to a specific region.

    An Integrated AHP–Entropy Weight Approach for Urban Construction Land Suitability Evaluation in Zhengzhou, China · 2026 · DOI

  • The accuracy of geographic evaluation is decreased by the fact that much earlier research relied on sparse data or distinct analytical approaches.

    A GIS-Based Entropy–AHP Hybrid Framework for Site Suitability Assessment of Radio Astronomy Observatories in Southern Jordan · 2026 · DOI

  • Multicollinearity among variables - Need for variable selection to reduce multicollinearity - Challenge of predicting habitat suitability under future climate…

    The extent of suitable areas for silvopastoral systems in India is projected to increase under future climate scenarios · 2026 · DOI

  • Investigation of alternative weighting schemes in the hybrid modelling framework, - Application of the hybrid modelling framework to other regions, - Further research on the impact of AFS on ecosystem…

    Agroforestry suitability and management zoning in the northwestern Himalayas using hybrid expert and machine-learning approaches · 2026 · DOI

  • Future studies should address these limitations by incorporating fine-scale agro-cli-matic data and crop-specific thresholds to enhance the accuracy of land…

    Optimal Land Selection for Agricultural Purposes Using Hybrid Geographic Information System–Fuzzy Analytic Hierarchy Process–Geostatistical Approach in Attur Taluk, India: Synergies and Trade-Offs Among Sustainable Development Goals · 2025 · DOI

  • Including more topographic features in future modelling scenarios - Exploring the relationship between topography and other types of crops - Applying the findings to other…

    Evaluating the Topographic Factors for Land Suitability Mapping of Specialty Crops in Southern Ontario · 2024 · DOI

Most-cited papers in Soil and Land Suitability Analysis

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Open questions raised by papers listed on this page include: (1) The lack of a hybrid approach combining expert knowledge and machine learning for agroforestry suitability assessment (“Agroforestry suitability and management zoning in the northwestern Himalayas…”, 2026); (2) Unsuitable cropland conditions or limited cropland area, lack of spare time, as well as low income expectations and high risk expectations, are the reasons why high part-time farmers rarely choose NGPC (“Influencing mechanism of farmers’ willingness to non-grain production of…”, 2026); (3) There is a lack of effective decision-support tools for conservation planning in Uganda (“Land Suitability Mapping of the Most Illegally Harvested Plant Species using a…”, 2026); (4) To address this gap, future research could explore how geographically specific factors can be systematically integrated into regional policy planning (“Decision Support for Peri-Urban Sustainability: An AHP–EWM Based Livability…”, 2025); (5) This specific methodology proves to be particularly useful for the Greek context, where the application of similar methodologies is lacking, especially in spatial and development planning (“Landscape Character Assessment for Sustainable Rural Development in Border…”, 2025). 176 gap statements have been mined from Soil and Land Suitability Analysis papers in our 7.9M-paper local library, which holds 599 papers on the topic; the gaps come from whichever of those papers state one. They are mostly the research gaps the authors state and the papers' abstracts, plus future-work, limitations and challenges passages. The ones listed below are a selection still marked open; each names the study that raised it, with a DOI link where the paper has one, so you can read the original claim in context.

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