Comparison of nano-silica extracted from rice husk with imported American nano-silica in silicon absorption and rice growth

Articles in Press

Document Type : Complete scientific research article

Authors

1 Dept of Soil Science, Faculty of agriculture, university of Guilan, Rasht, iran.

2 Corresponding author, Associate Prof., Soil Science Department, University of Guilan, Rasht, Iran.

Abstract

Comparison of nano-silica extracted from rice husk with imported American nano-silica in silicon absorption and rice growth
Abstract

Background and purpose: Silicon is an essential element for rice plants and its maximum uptake occure in vegetative growth stage. It increases resistance to environmental stresses and reduces the possibility of rot. To ensure the effectiveness of the use of siliceous fertilizers in paddy fields in north of Iran, more research should be done in order to decide about the necessity of its use. Due to the high price of imported nanosilica fertilizer, on the other hand, the cheap and availability of the outer shell of paddy as the annual waste of rice mills, as well as, the role that silicon plays in rice growth and increase the resistance of rice to living stresses such as pests and diseases and non-living stresses such as cold, heat, drought and salt, investigating the effectiveness of nano-silica produced from rice husk on silicon absorption and vegetative growth of rice compared to imported amorphous nano silica from USA is one of objectives of this applied research.

Materials and methods: In order to compare effectiveness of nanosilica extracted from the outer shell of paddy compared to commercial imported nano silica from USA on silicon absorption and vegetative growth of rice, a research with paddy soil with 4 treatments (amorphous nanosilica, semi-crystalline nanosilica, imported commercialized nanosilica from USA and rice husk ash also control sample (without addition of silica) and 4 replications were conducted in greenhouse of agriculture faculty in university of Guilan.

Result: Results showed that among the vegetative growth characteristics of the rice plant, leaf area and stem height at the time of tillering and at the end of the vegetative growth period, significantly in the plant treated with amorphouse nanosilica produced from rice husk in compared with imported amorphouse nanosilica, it was more. Despite this, number of leaves, dry weight of stem and leaf, wet weight of stem and leaf were traits that did not show significant difference between treatments. In addition, the results of determination of silicon in plants with ICP device showed that the amount of silicon in leaves and stems in plants treated with nanosilica was significantly higher than plants treated with imported commercial nanosilica. Investigation done by XRD and FESEM approved that silica produced from rice husk is nano-particle. The relationships in the principal component analysis showed that among the traits related to the vegetative growth of the rice plant, except the height of the stem in the early growth, the rest of the traits had a positive correlation with the amount of silicon in the leaves and stems. Also, the results of principal component analysis confirmed that there are three distinct groups including plants treated with amorphous nanosilica, the control sample, and plants treated with semi-crystalline nanosilica, rice husk ash, and imported commercial nanosilica, considering the clear overlap between these three treatments.

Conclusion: Results indicate the difference in rice plant characteristics between different treatments. Most of these changes are due to the change in the amount of silicon absorbed. All the traits of rice plants studied in this research, regardless of significance, showed the maximum value in rice plants treated with amorphous nanosilica extracted from rice husk. Results confirmed that amorphouse nanosilica produced from rice husk can be used as a suitable source of silicon to improve the vegetative growth of different parts of rice plant.
Keywords: Critical limit of soil silicity in paddy field, Environmental stress and silica, Silica fertilizer

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Journal of Soil Management and Sustainable Production

Articles in Press, Accepted Manuscript
Available Online from 16 November 2025

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