Increase of available soil silicon by Si-rich manure for sustainable rice production
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Depletion of bioavailable silicon, Si, in paddy soils can decrease the yields of rice. A potential solution is to amend soil with Si-rich organic wastes such as manure from animals fed with rice crop residues. Here, we studied Si in soils from 2000 to 2010 field experiments without manure, with 5 and 10 years of manure, in Eastern China. Results showed that available Si in soils increased from 130 to 270 mg kg−1 after 10 years of manure amendment. This finding is explained either by direct input of available Si or by Si produced by mineralization of Si minerals. To conclude, our results show that amending soil with Si-rich manure in the long term is a solution for sustainable rice production.
KeywordsSilicon bioavailability Fractionation Noncrystalline Si Paddy soil Pig manure Sustainable rice production
We are grateful for support from the National Natural Science Foundation of China (41103042), Program for the Distinguished Young and Middle-Aged Academic Leaders of Higher Education Institutions of Zhejiang Province (PD2013240), Program for the Top Young Talents of Zhejiang Agricultural and Forestry University, and the Field Frontier Project of Institute of Geochemistry, Chinese Academy of Sciences.
Conflict of interest
The authors have declared no conflict of interest.
- Lu RK (2000) Methods of soil agricultural chemical analysis. China Agricultural Science and Technology, Beijing (in Chinese)Google Scholar
- Matichenkov VV, Calvert DV (2002) Silicon as a beneficial element for sugarcane. J Am Soc Sugar Tech 22:21–30Google Scholar
- Nelson RE, Sommers LE (1982) Total carbon, organic carbon, and organic matter. In: Page AL, Miller RH, Keeney DR (eds) Methods of soil analysis, part 2, 2nd edn. Agron. Monogr. 9. ASA and SSSA, Madison, pp 539–579Google Scholar
- Prakash N.B. (2002) Status and utilisation of silicon in Indian rice farming. In: Proceedings of the second silicon in agriculture conference, Tsuruoka, Yamagata, Japan. Japanese Society of Soils and Plant Nutrition, pp. 266–273Google Scholar