Title : From waste to water: Reviving Indian agricultural wisdom through paddy straw-based bio-hydrogel technology for climate-resilient farming
Abstract:
Agriculture is increasingly challenged by water scarcity, declining soil quality, inefficient resource use, and the growing accumulation of agricultural residues. Among these challenges, paddy straw represents both an environmental burden and an untapped resource. Large quantities of rice residue are frequently burned after harvest, contributing to air pollution and the loss of valuable biomass. At the same time, irregular rainfall, high evaporation and nutrient losses threaten agricultural productivity, particularly in moisture-stressed regions.
This work proposes an innovative paddy straw-based bio-hydrogel technology that transforms agricultural waste into a value-added material for sustainable water and nutrient management. The concept draws inspiration from the traditional Indian agricultural philosophy of resource conservation, recycling, and working in harmony with nature, while integrating modern biomass processing and hydrogel science.
Paddy straw, naturally rich in cellulose, hemicellulose and lignin, is envisioned as a renewable feedstock for developing a biodegradable hydrogel matrix. The proposed process involves straw collection, cleaning and size reduction, pre-treatment, alkaline treatment, washing and purification to obtain a cellulose-rich fraction, followed by hydrogel formation, cross-linking, granulation and drying. The resulting bio-hydrogel is designed to function as a miniature water reservoir in the crop root zone, absorbing available moisture and gradually releasing it as soil moisture declines. Its potential nutrient-loading capability could further support controlled nutrient availability and reduce losses through leaching.
Unlike conventional approaches that primarily treat agricultural residue as waste, this innovation establishes a waste-to-resource pathway, simultaneously addressing residue management and water-use efficiency. The technology has potential applications in drought-prone agriculture, horticulture, controlled-release nutrient systems, landscaping and other water-sensitive production environments.
The proposed innovation therefore bridges Indian agricultural wisdom with contemporary environmental technology, creating a farmer-oriented pathway towards a circular bioeconomy. By converting paddy straw from a source of pollution into a functional agricultural input, the technology can contribute to cleaner environments, efficient resource utilization and climate-resilient farming. Ultimately, “From Waste to Water” represents a shift from residue disposal to resource regeneration—turning an agricultural challenge into an opportunity for sustainable innovation.
Keywords: Paddy straw; Bio-hydrogel; Circular bioeconomy; Waste-to-wealth; Water-use efficiency; Climate resilience; Sustainable agriculture; Resource recovery
