The evaluation of the carbon sequestration by rice roots under silicon fertilization

Abstract

The problem of elaboration and implementation of innovative, feasible, ecologically friendly nature-like technologies aiming at an increase in carbon (C) stock and significant reduction in greenhouse gas (GG) emission from all agricultural areas, including those under rice cultivation, is critically important. In field tests conducted in Hunan Province, China, carbon dioxide (CO₂) sequestration by roots of rice plants was evaluated as influenced by silicon (Si) fertilizers. The amount of additional CO₂ sequestrated was dependent on the content of plant-available Si in agrochemicals, frequency and duration of their application and granulometric composition of soil. The data obtained evidences the potential of Si fertilizers to promote the process of C sequestration and reduction in GG emission under rice cultivation. Their application provided an increase in rice yield by 12,1 to 71,2% and in the CO₂ fixation by root system by 0,95 to 14,9 t ha^-1 over one season. Returning C to soil and fertility reproduction could be provided via enhanced plant root system development and increased root debris after harvesting. Agrochemicals containing silicon available for plants should be included in the technology for the implementation of 4R-STRATEGY of mineral nutrition of agricultural crops.

References

1. Adrees М., АН S., Rizwan М. et al. Mechanisms of silicon-mediated alleviation of heavy metal toxicity in plants: A review // Ecotoxicol. Environ, safety. 2015. Vol. 119.

2. Аli M.A., Sattar M.A., Islam M.N., Inubushi К Integrated effects of organic, inorganic, and biological amendments on methane emission, soil quality and rice productivity in irrigated paddy ecosystem of Bangladesh: field study of two consecutive rice growing seasons // Plant and soil. 2014. Vol. 378 (1-2).

3. Bauer P., Elbaum R., Weiss I.M. Calcium and silicon mineralization in land plants: transport, structure and function // Plant sci. 2011. Vol. 180 (6).

4. Dakua T.B., Rangan L., Mitra S. Greenhouse gases emission from rice paddy ecosystem and their management // Crop improvement under adverse conditions. N.Y., 2013.

5. Dentener F., Kinne T., Bond O. et al. Emissions of primary aerosol and precursor gases in the years 2000 and 1750 prescribed data-sets for AeroCom // Atmosph. Chem. physics. 2006. Vol. 6 (12).

6. Haynes R.J. Significance and role of Si in crop production //Adv. in agronomy. 2017. Vol. 146.

7. Ma J.F., Takahashi E. Soil, fertilizer, and plant silicon research in Japan. Amsterdam, 2002.

8. Mullin J.B., Riley J.P. The colorimetric determination of silicate with special reference to sea and natural waters // Analyt. chimica acta. 1955. Vol. 12.

9. Song A., Fan F., Yin C. et al. The effects of silicon fertilizer on denitrification potential and associated genes abundance in paddy soil // Biol. Fertil. Soils. 2017. Vol. 53 (6).

10. Sparks D.L., Page A.L., Helmke P.A. et al. Methods of Soil Analysis. Part 3. Chemical Methods. Ser. 5.3. Medison, 1996.

11. Yagi K. Frontline research in mitigating greenhouse gas emissions from paddy fields // Soil sci. plant nutrit. 2018. Vol. 64(1).

12. Zhao S., Lou Y., Zhang Y. et al. Effect of silicate supply on CH4 and N2O emissions and their global warming potentials in a Chinese paddy soil under enhanced UV-B radiation //Acta ecol. sinica. 2017. Vol. 37 (14).