{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T12:24:04Z","timestamp":1787747044131,"version":"build-2784847793"},"reference-count":196,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T00:00:00Z","timestamp":1787702400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Standardization of bamboo and wood product quality and safety testing machines","award":["2025ZCY004"],"award-info":[{"award-number":["2025ZCY004"]}]},{"name":"Development and industrialization of new technologies for processing and utilizing bamboo","award":["2025ZCY003"],"award-info":[{"award-number":["2025ZCY003"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Gels"],"abstract":"<jats:p>Confronted with severe global challenges, including water scarcity, excessive use of chemical fertilizers and pesticides, and heavy metal contamination in soils, conventional agricultural technologies exhibit marked limitations in integrated water\u2013fertilizer management and non-point source pollution control. Leveraging their excellent water retention capacity, intelligent sustained-release properties, and environmental responsiveness, hydrogels offer innovative solutions to advance sustainable agricultural development. This review comprehensively outlines the fundamental types, crosslinking mechanisms, and key functional properties of hydrogels, with a focused discussion on their agricultural deployment as high-efficiency soil conditioners, fertilizer vectors, and pesticide carriers; it deciphers the microscopic water-holding mechanisms under the tristate water model, delineates the divergent water-uptake and retention behaviors between ionic and non-ionic hydrogels, and clarifies the cyclic water-holding and release mechanisms of hydrogels during soil amelioration. Thise paper further synthesizes hydrogel-enabled environmental remediation applications, in which heavy metals and pesticide residues in soils and aquatic systems are removed via functional-group coordination adsorption or photocatalytic degradation; concurrently, hydrogels have been shown to activate plant systemic immunity through calcium-signaling pathways, thereby inducing broad-spectrum antiviral defense responses. Moreover, hydrogels can be integrated into precision agriculture frameworks to enable real-time monitoring of crop physiological status and to support targeted irrigation and fertilization management. This work also evaluates the role of hydrogels in promoting seed germination, root system development, crop metabolic regulation, and stress resilience, while introducing tailored application strategies across distinct plant growth stages. Their documented economic advantages include water conservation, enhanced crop yields, reduced dependence on synthetic fertilizers, and lower labor costs. Nevertheless, the large-scale implementation of hydrogels continues to face multifaceted challenges\u2014particularly poor degradability and latent ecological risks, as conventional polyacrylamide (PAM)-based gels resist soil mineralization and retain potentially neurotoxic monomers, leaving a critical gap in multi-annual field data concerning their non-target interference with native soil aggregate evolution, pore distribution, and rhizospheric carbon\u2013nitrogen footprints. Mechanistically, many hydrogels with tensile strengths below 1 MPa are highly susceptible to three-dimensional network collapse under high-salinity osmotic shock and tillage mechanical stress, exhibiting a precipitous drop in water retention after more than three wet\u2013dry cycles due to deficient long-term structural stability. Compounding these technical gaps are elevated production costs and low farmer adoption, driven by the absence of texture-specific performance thresholds\u2014such as an available water increment \u2265 40% for sandy soils\u2014and the lack of established life-cycle cost models and farmer incentive mechanisms for bio-based hydrogels. Moving forward, hydrogel technology should pivot toward materials innovation and cost-reduction engineering to broaden its applicability, employ \u22653-year, multi-habitat regional trials to delineate ecological benefit\u2013risk boundaries, and ultimately position hydrogels as pivotal enablers of sustainable, green agricultural paradigms.<\/jats:p>","DOI":"10.3390\/gels12090763","type":"journal-article","created":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T11:53:42Z","timestamp":1787745222000},"page":"763","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Multifunctional Hydrogels in Sustainable Agriculture: Structure Design, Application and Future Challenges"],"prefix":"10.3390","volume":"12","author":[{"given":"Hanyu","family":"Huang","sequence":"first","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luohui","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"},{"name":"College of Forestry, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaobo","family":"Xue","sequence":"additional","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"},{"name":"College of Forestry, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Man","family":"Yin","sequence":"additional","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liyun","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Forestry, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6496-3178","authenticated-orcid":false,"given":"Youming","family":"Dong","sequence":"additional","affiliation":[{"name":"College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fei","family":"Xiao","sequence":"additional","affiliation":[{"name":"Hunan Academy of Forestry, Changsha 410018, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiangmeng","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Pharmacy, Changsha Medical University, Changsha 410219, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5830-155X","authenticated-orcid":false,"given":"Cheng","family":"Li","sequence":"additional","affiliation":[{"name":"College of Forestry, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xin","family":"Guo","sequence":"additional","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xian","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Horticulture, Henan Agricultural University, Zhengzhou 450026, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,8,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"663","DOI":"10.1038\/s44221-024-00265-y","article-title":"Solar-Driven Scalable Hygroscopic Gel for Recycling Water from Passive Plant Transpiration and Soil Evaporation","volume":"2","author":"Zou","year":"2024","journal-title":"Nat. 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