Effect of nanosilica and silicon sources on plant growth promoting rhizobacteria, soil nutrients and maize seed germination

Abstract

The study was aimed at evaluating the effect of nanosilica and different sources of silicon on soil properties, total bacterial population and maize seed germination. Nanosilica was synthesised using rice husk and characterised. Silica powder was amorphous (50 nm) with >99.9% purity. Sodium silicate treated soil inhibited plant growth promoting rhizobacteria in contrast to nanosilica and other bulk sources. Surface property and effect of soil nutrient content of nanosilica treatment were improved. Colony forming unit (CFU) was doubled in the presence of nanosilica from 4 × 105 CFU (control) to 8 × 105 CFU per gram of soil. The silica and protein content of bacterial biomass clearly showed an increase in uptake of silica with an increase in nanosilica concentration. Nanosilica promoted seed germination percentage (100%) in maize than conventional Si sources. These studies show that nanosilica has favourable effect on beneficial bacterial population and nutrient value of soil.

Induction of systemic resistance againstPapaya ring spot virus(PRSV) and its vectorMyzus persicaebyPenicillium simplicissimumGP17-2 and silica (Sio2) nanopowder

“…Nanosilica treatment exhibited a better effect than ordinary silica fertilizer application and controls at all observation variables such as plant height, root length, leaf length and root fresh and dry weight of rice plants (Amrullah & Sugianta 2015). Additionally, nanosilica has favorable effects on beneficial bacterial population, nutrient value of soil and seed germination percentage in maize than conventional Si sources (Karunakaran et al 2013). The phytotoxicity of silica nanoparticles was evaluated as a function of concentration (250 and 1000 mg L ¡1 ) toward Arabidopsis thaliana plants.…”

Investigating lead and zinc uptake and accumulation by Stipa hohenackeriana trin and rupr. in field and pot experiments

“…MSWC treatments increased soil P content, while it did not show a significant difference between NS treatments with control (p<0.05). Karunakaran et al (2013) reported that the availability of silicon sources (sodium silicate, micron silica, silicic acid, and tetraethyl silicate) might increase available nitrogen, phosphorus, and potassium (NPK) value to some extent, which is not comparable with NS. Thus, the incorporation of NS into soil enhances soil NPK values.…”

“…The reason for the decrease in the pH is probably that hydrated silica is formed through binding the Si-O to water molecules and hence reduces pH. Karunakaran et al (2013) and Iler (1979) found that nanosilica and microsilica shows a slight decrease in pH as they both are slightly soluble in water at ppm range, which is converted to silicon colloids because of hydrogen bonding, making them biologically active molecules. EC was low in MSWC treatments, increased in NS250 treatment it was increased as compared with control and decreased in NS500 treatment.…”

“…The introduction of nanoparticles into plants might have a significant impact and, thus, it can be used for agricultural applications for a better growth and yield. Different researchers have shown that the application of NS in the soil enhances the growth of maize (YUVAKKUMAR et al, 2013). Karunakaran et al, (2013) reported that the silica and protein content of bacterial biomass clearly showed an increase in uptake of silica with an increase in NS concentration in maize.…”

“…Different researchers have shown that the application of NS in the soil enhances the growth of maize (YUVAKKUMAR et al, 2013). Karunakaran et al, (2013) reported that the silica and protein content of bacterial biomass clearly showed an increase in uptake of silica with an increase in NS concentration in maize. NS promotes seed germination percentage (100%) in maize and has a favorable effect on beneficial bacterial population and nutrient value of soil.…”