{"type": "FeatureCollection", "features": [{"id": "10.2136/vzj2017.04.0083", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:21:12Z", "type": "Journal Article", "created": "2018-02-15", "title": "Rhizosphere\u2010Scale Quantification of Hydraulic and Mechanical Properties of Soil Impacted by Root and Seed Exudates", "description": "Core Ideas<p> <p>We hypothesized that plant exudates gel soil particles and on drying enhance water repellency.</p> <p>This has been carried out using rhizosphere\uffe2\uff80\uff90scale mechanical and hydraulic measurements.</p> <p>Plant exudates enhanced soil hardness and modulus of elasticity as chia seed &gt; maize root &gt; barley root.</p> <p>Plant exudates caused measureable decreases in soil wetting rates through water repellency.</p> </p><p>Using rhizosphere\uffe2\uff80\uff90scale physical measurements, we tested the hypothesis that plant exudates gel together soil particles and, on drying, enhance soil water repellency. Barley (Hordeum vulgare L. cv. Optic) and maize (Zea mays L. cv. Freya) root exudates were compared with chia (Salvia hispanica L.) seed exudate, a commonly used root exudate analog. Sandy loam and clay loam soils were treated with root exudates at 0.46 and 4.6 mg exudate g\uffe2\uff88\uff921 dry soil and chia seed exudate at 0.046, 0.46, 0.92, 2.3 and 4.6 mg exudate g\uffe2\uff88\uff921 dry soil. Soil hardness and modulus of elasticity were measured at \uffe2\uff88\uff9210 kPa matric potential using a 3\uffe2\uff80\uff90mm\uffe2\uff80\uff90diameter spherical indenter. The water sorptivity and repellency index of air\uffe2\uff80\uff90dry soil were measured using a miniaturized infiltrometer device with a 1\uffe2\uff80\uff90mm tip radius. Soil hardness increased by 28% for barley root exudate, 62% for maize root exudate, and 86% for chia seed exudate at 4.6 mg g\uffe2\uff88\uff921 concentration in the sandy loam soil. For the clay loam soil, root exudates did not affect soil hardness, whereas chia seed exudate increased soil hardness by 48% at 4.6 mg g\uffe2\uff88\uff921 concentration. Soil water repellency increased by 48% for chia seed exudate and 23% for maize root exudate but not for barley root exudate at 4.6 mg g\uffe2\uff88\uff921 concentration in the sandy loam soil. For the clay loam soil, chia seed exudate increased water repellency by 45%, whereas root exudates did not affect water repellency at 4.6 mg g\uffe2\uff88\uff921 concentration. Water sorptivity and repellency were both correlated with hardness, presumably due to the combined influence of exudates on the hydrological and mechanical properties of the soils.</p", "keywords": ["/dk/atira/pure/subjectarea/asjc/1100/1111", "550", "EP/M020355/1", "seed exudate", "QH301 Biology", "551", "630", "QH301", "DIMR 646809", "GE1-350", "2. Zero hunger", "soil mechanical stability", "QE1-996.5", "BB/J000868/1", "Civil_env_eng", "name=Soil Science", "Root exudate", "Geology", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water", "Environmental sciences", "BB/J011460/1", "BB/L026058/1", "Engineering and Physical Sciences Research Council (EPSRC)", "rhizosphere-scale indenter and infiltrometer", "soil water repellency", "Biotechnology and Biological Sciences Research Council (BBSRC)", "0401 agriculture", " forestry", " and fisheries", "European Research Council"]}, "links": [{"href": "https://repository.uwl.ac.uk/id/eprint/4977/1/vzj-17-1-170083-1.pdf"}, {"href": "https://eprints.soton.ac.uk/415075/1/vzj2017.04.0083_1.pdf"}, {"href": "https://eprints.soton.ac.uk/415075/2/vzj_17_1_170083_1_.pdf"}, {"href": "https://onlinelibrary.wiley.com/doi/pdf/10.2136/vzj2017.04.0083"}, {"href": "https://doi.org/10.2136/vzj2017.04.0083"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Vadose%20Zone%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.2136/vzj2017.04.0083", "name": "item", "description": "10.2136/vzj2017.04.0083", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.2136/vzj2017.04.0083"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-01-01T00:00:00Z"}}, {"id": "10.3390/land13111759", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:21:45Z", "type": "Journal Article", "created": "2024-10-28", "title": "Temperate Soils Exposed to Drought\u2014Key Processes, Impacts, Indicators, and Unknowns", "description": "<?xml version='1.0' encoding='UTF-8'?><article><p>The summer drought in the United Kingdom (UK) in 2022 produced significant speculation concerning how its termination may impact and interact with the soil resource. Whilst knowledge regarding soils and droughts exists in the scientific literature, a coherent understanding of the wider range of impacts on soil properties and functions has not been compiled for temperate soils. Here, we draw together knowledge from studies in the UK and other temperate countries to understand how soils respond to drought, and importantly what and where our knowledge gaps are. First, we define the different types of droughts and their frequency in the UK and provide a brief overview on the likely societal impacts that droughts place on the soil and related ecosystems. Our focus is on \u2018agricultural and ecosystem drought\u2019, as this is when soils experience dry periods affecting crops and ecosystem function, followed by rewetting. The behaviour of moisture in soils and the key processes that contribute to its storage and transport are examined. The principal changes in the physical, chemical, and biological properties of soils resulting from drought, and rewetting (i.e., drought termination) are discussed and their extensive interactions are demonstrated. Processes that are involved in the rewetting of soils are explored for soil and catchment-scale soil responses. Lastly, soils\u2019 recovery after drought is considered, knowledge gaps are identified, and areas to improve understanding are highlighted.</p></article>", "keywords": ["soil health", "rewetting", "soil microbes", "S", "soil water infiltration", "soil water repellency", "drought recovery", "soil nutrients", "Agriculture", "drought termination", "meteorological drought", "soil moisture", "soil fauna"]}, "links": [{"href": "https://www.mdpi.com/2073-445X/13/11/1759/pdf"}, {"href": "https://doi.org/10.3390/land13111759"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Land", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.3390/land13111759", "name": "item", "description": "10.3390/land13111759", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.3390/land13111759"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2024-10-26T00:00:00Z"}}, {"id": "2164/10082", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:26:42Z", "type": "Journal Article", "created": "2018-02-15", "title": "Rhizosphere\u2010Scale Quantification of Hydraulic and Mechanical Properties of Soil Impacted by Root and Seed Exudates", "description": "Core Ideas                     <p>                                                                           <p>We hypothesized that plant exudates gel soil particles and on drying enhance water repellency.</p>                                                                             <p>This has been carried out using rhizosphere\uffe2\uff80\uff90scale mechanical and hydraulic measurements.</p>                                                                             <p>Plant exudates enhanced soil hardness and modulus of elasticity as chia seed &gt; maize root &gt; barley root.</p>                                                                             <p>Plant exudates caused measureable decreases in soil wetting rates through water repellency.</p>                                                                     </p>                     <p>                       Using rhizosphere\uffe2\uff80\uff90scale physical measurements, we tested the hypothesis that plant exudates gel together soil particles and, on drying, enhance soil water repellency. Barley (                       Hordeum vulgare                       L. cv. Optic) and maize (                       Zea mays                       L. cv. Freya) root exudates were compared with chia (                       Salvia hispanica                       L.) seed exudate, a commonly used root exudate analog. Sandy loam and clay loam soils were treated with root exudates at 0.46 and 4.6 mg exudate g                       \uffe2\uff88\uff921                       dry soil and chia seed exudate at 0.046, 0.46, 0.92, 2.3 and 4.6 mg exudate g                       \uffe2\uff88\uff921                       dry soil. Soil hardness and modulus of elasticity were measured at \uffe2\uff88\uff9210 kPa matric potential using a 3\uffe2\uff80\uff90mm\uffe2\uff80\uff90diameter spherical indenter. The water sorptivity and repellency index of air\uffe2\uff80\uff90dry soil were measured using a miniaturized infiltrometer device with a 1\uffe2\uff80\uff90mm tip radius. Soil hardness increased by 28% for barley root exudate, 62% for maize root exudate, and 86% for chia seed exudate at 4.6 mg g                       \uffe2\uff88\uff921                       concentration in the sandy loam soil. For the clay loam soil, root exudates did not affect soil hardness, whereas chia seed exudate increased soil hardness by 48% at 4.6 mg g                       \uffe2\uff88\uff921                       concentration. Soil water repellency increased by 48% for chia seed exudate and 23% for maize root exudate but not for barley root exudate at 4.6 mg g                       \uffe2\uff88\uff921                       concentration in the sandy loam soil. For the clay loam soil, chia seed exudate increased water repellency by 45%, whereas root exudates did not affect water repellency at 4.6 mg g                       \uffe2\uff88\uff921                       concentration. Water sorptivity and repellency were both correlated with hardness, presumably due to the combined influence of exudates on the hydrological and mechanical properties of the soils.                     </p>", "keywords": ["/dk/atira/pure/subjectarea/asjc/1100/1111", "550", "EP/M020355/1", "seed exudate", "QH301 Biology", "551", "630", "QH301", "DIMR 646809", "GE1-350", "2. Zero hunger", "soil mechanical stability", "QE1-996.5", "BB/J000868/1", "Civil_env_eng", "name=Soil Science", "Root exudate", "Geology", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water", "Environmental sciences", "BB/J011460/1", "BB/L026058/1", "Engineering and Physical Sciences Research Council (EPSRC)", "rhizosphere-scale indenter and infiltrometer", "soil water repellency", "Biotechnology and Biological Sciences Research Council (BBSRC)", "0401 agriculture", " forestry", " and fisheries", "European Research Council"]}, "links": [{"href": "https://repository.uwl.ac.uk/id/eprint/4977/1/vzj-17-1-170083-1.pdf"}, {"href": "https://eprints.soton.ac.uk/415075/1/vzj2017.04.0083_1.pdf"}, {"href": "https://eprints.soton.ac.uk/415075/2/vzj_17_1_170083_1_.pdf"}, {"href": "https://onlinelibrary.wiley.com/doi/pdf/10.2136/vzj2017.04.0083"}, {"href": "https://doi.org/2164/10082"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Vadose%20Zone%20Journal", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "2164/10082", "name": "item", "description": "2164/10082", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/2164/10082"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2018-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=soil+water+repellency&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=soil+water+repellency&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=soil+water+repellency&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=soil+water+repellency&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-06-24T14:19:20.483630Z"}