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Agronomy inexorably contributes an eminent role in food nutriment and the economic upswing of a country. Micronutrients though required exiguously; are vital for the growth, health, and higher yields of the crops. Micronutrient supplementation at a controlled rate in an economical and ecofriendly way is the major challenge, an agro-researcher has to deal with. The potential of scientific research entails the usage of natural, renewable, and abundant raw materials that endow a solution to the agronomical challenges of today's world. Besides being non-hazardous, biopolymer-based matrices are pertinent materials that act as a reservoir of micronutrients and are a boon for agronomy, this review explores the synthesis of biomatrices, loading of micronutrients into the bio-matrix, kinetics, and mechanism of release of micronutrients along with the citations of the biopolymer-based matrices used till date for the controlled release of micronutrients that would be rewarding for forthcoming research. These green polymeric matrices have been explored a lot for the release of micronutrients iron, copper, and zinc but more research is required for the supplementation of boron, molybdenum, and manganese. The bio-matrices applied as micronutrient carrier vehicle in agronomy results in enhanced growth, high crop yield, and sustainability.

Water sustenance is the primary exigency for human survival, besides being significant for food, energy generation, ecology, and socio-economic modernization. The water crisis headed call for wastewater treatment. Owing to positive aspects of Organic Hybrid Hydrogels (OHH) viz. non-toxicity, multiplefunctionalities, biodegradability, biocompatibility, and high sorption capacities; researchers are exploring their usage in waste-water treatment for removal of organic (dyes) and inorganic (heavy metals, radionuclides) contaminants. The boon of OHH application is their ease of separation after the adsorption of pollutants by removing and dewatering them. This review corroborates the complete design of the synthesis of hydrogels, and the adsorption of impurities by them followed by their recovery, required for successful application in the removal of organic and inorganic contaminants from wastewater. It was observed hydrogels employed for the removal of metal ions and dyes follow either Langmuir or Freundlich isotherm or both. The usage of bio-based hydrogels increased the adsorption of contaminants from wastewater. Due to the scarcer exploration of bio/hybrid hydrogels (especially carboxymethyl tamarind kernel gum), this review is expedient for researchers for developing green hydrogels as a water conservation and sustenance technique.