Summary
This narrative review examines the application of hydrogel as a water-retention amendment in urban agriculture systems. The authors assess hydrogel production and crosslinking methodologies, characterise their functional properties, analyse water absorption and release mechanisms, and critically evaluate advantages and limitations across diverse environmental and plant-species contexts relevant to urban farming. The review suggests hydrogel remains a promising but incompletely understood technology whose optimal deployment depends on careful matching to specific growing conditions and crop requirements.
Regional applicability
The review's scope is global and technology-focused rather than geographically anchored, making findings potentially applicable to United Kingdom urban farming contexts (e.g., rooftop gardens, vertical farms, container production). Transferability to UK conditions would depend on validation studies addressing UK climate variability, water availability patterns, and common urban vegetable species.
Key measures
Hydrogel types, structure, physical properties, chemical properties, water absorption capacity, water release mechanisms, performance under external environmental factors, plant species compatibility
Outcomes reported
The review synthesises evidence on hydrogel production methods, crosslinking techniques, physical and chemical characteristics, water absorption and release mechanisms, and suitability across different plant species in urban farming contexts. It evaluates both the potentials and limitations of hydrogel application under varying environmental conditions.
Topic tags
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