Abstract
Surface capped copper sulfide nano-aquaformulations were prepared by in situ combination of copper ions with sulfide ions using sonochemical method, followed by microwave irradiations, in the presence of capping agents. Prepared nano-aquaformulations were characterized for particle size, morphology and optical properties. The in vitro antifungal evaluations studies indicated multifold efficacy against Alternaria alternata, Drechslera oryzae and Curvularia lunata in comparison to standard used. The in vivo seed treatment on discoloured paddy seeds showed the optimum results on application @ 7μg/ml for 2 h in case of citrate capped copper sulfide nanoformulation (NCuS3). Significant reduction in seed rot and seedling blight was observed with favourable effect on germination and growth parameters at this concentration.
Highlights
The modern agriculture requisites the exploration of substances that exist in nature and are simple for nature to interpret them
Prepared nano-aquaformulations were characterized for particle size, morphology and optical properties
Efficacy of the copper compounds can be considerably improved by reducing the particle size (Torgeson 1967), as it results in more surface area available per gram of product (Navarro et al 2008), advocating exploration of nano-technological applications in agriculture
Summary
The modern agriculture requisites the exploration of substances that exist in nature and are simple for nature to interpret them. Copper sulfide (CuS) is one of the most detoxified form of copper (Baek 2017; Baek and Kim 2017; Guo et al 2013; Wang et al 2013), natural, thermally stable (Rao et al 2016), water insoluble (Guo et al 2013) still retaining the biopotential of copper (Chakraborty et al 2016; Prabhavathi et al 2015) It is relatively safe and non-toxic behaviour to humans (Guo et al 2013) and limited literature on synthesis and biopotential on water dispersed CuS nanoparticles prompted us to prepare the novel surface protected formulations of nano-copper sulfide in aqueous media, for the evaluation of mycocidal potential against various agriculturally important phytopathogenic fungi. To best of the author’s knowledge it is the first reporting on in vitro myotoxicity along with on seed germination and seed quality parameters, on discoloured rice seeds, by application
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