Data gaps in Agriculture

Representative open questions

Showing 30 of 89 — one per source paper, highest-quality first.

• Development and research trends of stay-green biology in legumes: a bibliometric and visual analysis over three decades (2026) · doi

  Natural variation in chlorophyll catabolic genes (NYC1, PPH) has been identified in pea cultivars, but systematic screening of this variation across diverse legume germplasm collections is lacking. SNP variation and gene deletion polymorphisms in stay-green loci need comprehensive characterization across wild and cultivated legume species.

• Quantifying insecticide exposure across an agricultural landscape gradient using barn swallows as a wildlife indicator (2026) · doi

  Urban sources of aquatic neonicotinoid contamination (from turf and ornamental imidacloprid applications) have been identified but not systematically quantified or compared to agricultural sources in the context of barn swallow habitat use; integrated sampling across urban-rural landscape gradients is required to determine the relative contribution of each source to overall wildlife exposure.

• Evaluation of the effects of hydrogel and glycine betaine application on growth, physiological characteristics and yield of peanut under water deficit (2026) · doi

  The conclusion states that hydrogel and GB promoted phenol accumulation and compatible solute accumulation (proline and free amino acids) under water stress, but the temporal dynamics of these biochemical responses—specifically when during the growing season these compounds peak—were not characterized for peanut. Future studies should employ time-course sampling (flowering, pod development, maturity stages) to determine stage-specific compatible solute and phenol responses.

• Rapid fertilizer turnover and dominant soil N mineralization in a cool-climate vineyard revealed by 15N tracing, biological N availability, and N exposure (2026) · doi

  The N balance quantification revealed ~71% of applied fertilizer N as unaccounted for in the N25 treatment, partitioned between roots, soil organic matter, and apparent losses from the 0–50 cm profile. Direct measurement of N retained in root systems and quantification of N leached to deeper soil layers (>50 cm) is needed to distinguish actual environmental losses (denitrification, NH3 volatilization) from downward N mobility in cool-climate vineyards.

• Dynamic regulation of secondary metabolites and agarwood aroma compounds in Aquilaria sinensis by the endophytic fungus NSZJ-CX-22 revealed through metabolomics and GC–MS (2026) · doi

  The pentose phosphate pathway and pentose-glucuronate interconversions showed the lowest enrichment at 28d culture, yet carbohydrate-derived metabolites were proposed as critical for energy metabolism optimization. Direct measurement of carbohydrate flux rates and correlation with agarwood aroma compound accumulation (sesquiterpenes, volatile secondary metabolites) across the four time points is needed.

• Multivariate elucidation of soil-microbial-physiological interactions under bio-organic nutrient modules in kiwifruit (Actinidia deliciosa A. Chev.) (2026) · doi

  The study did not measure long-term soil carbon sequestration rates or temporal dynamics of microbial diversity beyond the single growing season; multi-year monitoring of changes in microbial community structure, carbon stocks, and aggregate stability under sustained bio-organic nutrient management is needed.

• Integrating combining ability and multivariate analysis for the selection of superior tomato hybrids (2026) · doi

  The trade-offs between plant architecture (FA1), fruit quality (FA2), and yield components (FA3) identified in the superior hybrids (H17 showing limitations in FA2; H11 in FA1; H2 in FA3) have not been quantitatively characterized. Specific investigation of the genetic correlations underlying these trait trade-offs would inform strategies for developing balanced ideotypes.

• Ecological partnerships for a cooler planet: Rhizobia-legume interactions and carbon sequestration potential (2026) · doi

  Research on legume-rhizobia symbiosis and carbon sequestration potential is concentrated in North America and Europe, while similar investigations of soil fertility improvement and nitrogen-fixation benefits are scarce in underrepresented regions. Comparative studies examining how legume-rhizobia systems perform across distinct soil conditions, plant diversity, and rhizobia strain compatibility in tropical, subtropical, and arid agroecosystems are needed to develop region-specific optimization strategies.

• Assessment of Natural Radionuclides Concentrations and Radiological Hazards from Soil Samples in Alabata and Its Environs, Ogun State, Southwestern Nigeria (2026) · doi

  The paper attributes the five-fold reduction in ²³⁸U concentration relative to world averages to near-surface weathering and leaching, but does not provide quantitative data on soil pH, oxidation-reduction potential, or soil moisture content that would mechanistically explain uranium mobility in the Alabata granitic soils.

• Biogas Production Efficiency and Slurry Fertilizer Quality Using Poultry and Livestock Organic Waste Under Anaerobic Composting (2026) · doi

  Water binding dynamics and thermal activity during the 20-day anaerobic digestion process were mentioned in relation to dry matter changes, but actual temperature profiles, moisture retention curves, and their correlation with biogas production kinetics were not provided for the poultry-livestock waste system.

• COMPOST-MEDIATED MODULATION OF CHLORPYRIFOS RESIDUES: IMPACTS ON SOIL PROPERTIES AND HUMAN HEALTH RISKS FROM YAM (Dioscorea rotundata) CONSUMPTION (2026) · doi

  The study measured hazard quotient (HQ) and toxicity quotient (TQ) for chlorpyrifos accumulation in yam tubers but did not conduct chronic toxicity assessments or establish dose-response relationships for yam consumption patterns specific to the study population. Health risk characterization was based solely on estimated daily intake (EDI) derived from single-harvest sampling; longitudinal dietary exposure studies tracking repeated yam consumption over growing seasons, combined with age-stratified vulnerability assessments for children and pregnant women, are needed to validate whether HQ≤1 thresholds adequately protect consumers.

• Soil and Environmental Chemistry: Exercises (2017) · doi

  Pb2+ adsorption experiments on kaolinite KGa-1 were conducted at a fixed pH 4, but the adsorption isotherm model selection (partitioning vs. site-limited) and the derived adsorption coefficients have not been tested across pH 3-6 to characterize how pH-dependent changes in surface charge affect Pb2+ binding mechanisms on this clay mineral.

• Evaluación comparativa de frameworks de visión artificial para el conteo automatizado y monitoreo de especies menores en sistemas pecuarios (2026) · doi

  Current research demonstrates a significant gap in public datasets specialized for minor species (guinea pigs, rabbits, and small-scale poultry systems). While bovine and large-scale poultry datasets exist, there is a critical absence of annotated image datasets for guinea pigs and rabbits in high-density production environments, preventing fine-tuning and validation of detection models on these species.

• Foliar potassium–calcium nutrition enhances fruit yield, quality and mitigates cracking in guava (Psidium guajava L.) under humid subtropical conditions (2026) · doi

  The conclusion states that soil calcium availability may be relatively lower in the experimental soil despite moderate fertility, but the critical threshold calcium concentration in guava-growing humid subtropical soils below which foliar supplementation becomes necessary has not been established, nor has the optimal soil-to-foliar calcium ratio for this crop been determined.

• Simulating water-nitrogen transport for winter wheat under drought-rewatering conditions in the North China (2026) · doi

  The differential suppression of nitrification between jointing and filling stages under high-temperature drought is attributed to enzyme activity suppression, but the specific temperature thresholds (>30°C, >35°C) that inhibit ammonia monooxygenase and nitrite oxidoreductase activity remain unquantified for North China Plain wheat soils.

• Robust apple leaf disease diagnosis for sustainable horticulture: overcoming background noise with a multilayer transformer-based approach (2026) · doi

  The robustness evaluation uses data augmentation operations (rotation and shearing) to simulate geometric distortions, but does not test the MTADC model's performance under specific real-world conditions such as extreme illumination variance, severe branch occlusion, or partial leaf necrosis independently. Controlled experiments varying individual environmental factors would identify which real-world imaging conditions most challenge the model.

• Mastering feed efficiency for a sustainable operation in poultry industry (2026) · doi

  Alternative feed ingredients such as insect meals, algae, and agro-industrial by-products are predominantly evaluated over short experimental periods under controlled conditions, with limited long-term, system-level evaluations within full commercial poultry production cycles. Standardized processing methods, digestibility modeling accounting for anti-nutritional factors, and economic assessments determining scalable sustainability potential of these ingredients for feed efficiency improvement are lacking.

• Soil Chemistry (2012) · doi

  The relative contributions of organic acid sources (anthropogenic emissions, biogenic emissions, and chemical transformations of precursors) to metal mobilization and solubility in soil systems have not been systematically quantified. Studies should measure the proportional input of acetic acid, formic acid, citric acid, oxalic acid, and tartaric acid from each source and correlate these to cadmium and other metal release rates across different soil types.

• DELG Net: A Dual-Stream Cross-Attention Framework for Automated Nutrient Deficiency Detection in Mulberry Leaves (2026) · doi

  The DELG Net model was evaluated exclusively on mulberry (Morus) leaves with four nutrient deficiency classes (nitrogen, phosphorus, potassium, and healthy); validation across other crop species and additional micronutrient deficiencies (iron, magnesium, zinc, boron) requires investigation to establish generalizability of the dual-stream cross-attention framework.

• Classification of Walnut Leaf Images Using a Hybrid CNN-Based Deep Learning Approach (2026) · doi

  The walnut dataset contains only 1,751 original leaf images across 18 varieties; the minimum effective dataset size and class balance requirements for training robust hybrid CNN models in leaf-based plant classification, specifically for walnut species with similar morphological features, remain unexplored.

• Effect of Applying GA3 Treatment on Vitis vinifera Agronomical Traits and Embryo Germination Rate (2026) · doi

  While the study identifies that high GA3 concentrations completely destroyed rudiments in both seeded and seedless varieties, the dose-response relationship and optimal GA3 concentration threshold for balancing fruit set and berry enlargement without compromising embryo viability across different Vitis vinifera cultivars has not been characterized.

• Agrivoltaic System Designing for Sustainability and Smart Irrigation (2026) · doi

  The paper claims that partial shading from solar panels reduces soil evaporation and creates a favorable microclimate for certain crops, but provides no empirical data comparing evapotranspiration rates, soil temperature profiles, or crop yield outcomes between agrivoltaic zones (under panels), inter-panel zones, and open-field control areas under identical paddy cultivation conditions.

• Hydrological Simulation of a Minor Irrigation Tank in Yerra Mandala, Krishna District, A.P (2026) · doi

  Field efficiency (80%) and canal conveyance efficiency (90%) are assumed as constants in water requirement calculations; site-specific investigation of actual field and conveyance losses under varying discharge conditions and operational schedules in minor irrigation tanks needs to be conducted.

• Model test on longitudinal differential settlement of operational shield tunnel under localized surface loading (2026) · doi

  Each load level in the model tests was applied for only one hour, which does not capture the time-dependent behavior of soil consolidation. Future studies must extend loading duration to measure long-term settlement effects of shield tunnels under sustained surface loading to quantify consolidation-induced differential settlement.

• Biodiminution of lithium in forest floor food webs (2026) · doi

  The bibliometric analysis by Guo et al. (2025) covers metal(loid) bioaccumulation trends from 1963-2024 but does not isolate or synthesize findings specific to lithium dynamics in forest detrital systems versus aquatic systems. A targeted meta-analysis comparing bioaccumulation factors for lithium across terrestrial arthropod taxa in forest ecosystems is needed.

• Performance of Spring Wheat Genotypes for Quality, Yield, and Related Reproductive Traits under Different Production Systems (2026) · doi

  The paper reports 1000-grain weight ranging from 33.63 g to 42.80 g across treatment combinations, but does not examine whether these variations correlate with specific seed composition parameters (starch, lipid, or mineral content) or milling characteristics (extraction rates, flour quality metrics). The relationship between observed grain weight improvements and downstream milling performance requires quantitative investigation.

• Impact of Zinc, Selenium and Germanium Citrate Nanoparticles on the Lipid and Phospholipid Composition of Blood Plasma in Rabbits under Severe and Moderate Heat Stress Conditions (2026) · doi

  The relative effects of zinc, selenium, and germanium citrate nanoparticles on phospholipid and lipid composition remain incompletely characterized across the two heat stress conditions (moderate and severe) and three experimental timepoints. Comparative mechanistic studies isolating the individual contributions of each nanoparticle element to the observed changes in specific phospholipid species under distinct thermal stress regimens are needed.

• Inferring drivers of tropical isoprene: competing effects of emissions and chemistry (2026) · doi

  The study uses CrIS monthly retrievals (2012-2020) but does not address how seasonal or interannual variability in NOx sources (especially lightning and soil emissions parameterized by OTD/LIS and BDSNP) modulates the inferred isoprene drivers across different tropical regions.

• Traditional medicinal uses, diversity, and conservation status of Malagasy aromatic plants: a review (2026) · doi

  The paper documents 40+ traditional uses for Euphorbia hirta alone, drawn from sources spanning 1957-2017, yet no source provides the specific plant part used (leaf, root, stem, latex), preparation method (decoction, infusion, maceration), or dosage for individual therapeutic claims. Standardized ethnobotanical data collection protocols specifying plant anatomy, extraction method, and quantitative dosage are required to enable reproducible phytochemical screening and clinical validation of these traditional applications.

• Comparative Effects of Organic and Inorganic Fertilizers on the Nutritional Profile and in Situ Digestibility of Alfalfa (Medicago sativa L.) in Cannulated Buffalo Bulls (2026) · doi

  Only urea (inorganic) and unspecified organic nitrogen sources were compared; the study lacks evaluation of alternative inorganic nitrogen sources (ammonium nitrate, ammonium sulfate) or slow-release organic sources (compost, manure types) to determine whether the superiority of T5 is specific to urea or generalizable across nitrogen fertilizer formulations.