Thumbnail Image

Thesis

Browse

20171
Reset filters
Subject: Soil Science and Agriculture Chemistry × Author: Ajayan, Amrutha S. × Start date: 1961 × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    Response of Maize (Zea mays L.) to Green Synthesized Zno Nanoparticles in a Calcareous Vertisol
    (University of Agricultural Science, Dharwad, 2017-07) Ajayan, Amrutha S.; Hebsur, N.S.
    A laboratory study was conducted at the Department of Soil Science and Agricultural Chemistry, UAS, Dharwad during 2016-17 to green synthesize zinc oxide nanoparticles (ZnO NPs) from analytical grade zinc nitrate using five different plant leaf extracts viz., calotropis, tea, neem, tulasi and datura. The green synthesized ZnO NPs were characterized for their size and shape. In UV-spectroscopy, absorbance peaks of particles ranged from 345-370 nm confirming their size in nano range. In particle size analyzer and scanning electron microscopy calotropis leaf extract synthesized nanoparticles recorded smallest size (79.6 nm) and datura the highest (497.4 nm). The shape ZnO NPs varied from rod to spherical. The chemical composition of green synthesized ZnO NPs was determined with energy dispersive atomic X-ray analysis which revealed that synthesized particles were not pure, but contains other elements from leaf extracts. A pot culture experiment was conducted with 12 treatment combinations and 60 days duration to study the response of maize to green synthesized ZnO NPs.The study revealed that foliar application of nano ZnO at lower concentrations of 250, 500 and 750 ppm (T7, T8 and T9, respectively) were very effective in enhancing growth and nutrients uptake by maize plants than the conventional zinc sulphate spray @ 0.5 per cent. The growth parameters such as plant height, leaf area, chlorophyll content and dry matter production recorded maximum for treatment which received nano ZnO spray @ 250 ppm. Treatments T8 and T9 were on par with T7. Nano ZnO spray at higher concentrations (@ 1,000, 1,500 and 2,000 ppm) reduced growth and nutrients uptake of maize compared to lower concentrations (250, 500 and 750 ppm) due to zinc toxicity.