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Title: Silicon nutrition of rice is affected by soil pH, weathering and silicon fertilisation
Contributor(s): Tavakkoli, Ehsan (author); Lyons, Graham (author); English, Peter Warren (author); Guppy, Christopher  (author)orcid 
Publication Date: 2011
DOI: 10.1002/jpln.201000023
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Abstract: Silicon (Si) is a beneficial element for tropical grasses such as rice ('Oryza sativa') and responses to applications of Si are common on highly weathered soils. However, the importance of pH (and hence Si speciation), weathering and fertilisation on Si uptake is still poorly understood. The responses of rice to Si fertilisation were studied in two variably weathered basalt soils (Red Ferrosol, Grey Vertosol) adjusted at different pH values (5.5-9.5) with three levels of acidulated wollastonite. Soil Si was extracted using deionised water (H₂O), 0.01 M CaCl₂, or 0.5 M NH₄OAc. Significant increases in Si uptake and rice biomass were observed in the Red Ferrosol following fertilisation (p < 0.01). Greater biomass production was observed at lower pH, due to decreased Si sorption and higher solution Si concentrations. Silicon uptake by rice was greater at low pH, despite similar extractable Si concentrations; suggesting a relationship between Si speciation and uptake. In contrast, Si uptake and rice shoot dry matter in the less weathered Grey Vertosol were unaffected by Si fertilisation (p > 0.05) except at the highest rate and lowest pH (5.5). Solution Si concentrations were controlled by precipitation/polymerisation reactions in equilibrium with specific soil pH values rather than adsorption processes. Silicon speciation effects (monosilicic acid vs. silicate ions) were unable to be measured due to an induced phosphorus deficiency in both soils at pH values > 8.5. In conclusion, weathered soils are more responsive to Si fertilisation and Si uptake is increased at low pH.
Publication Type: Journal Article
Source of Publication: Journal of Plant Nutrition and Soil Science, 174(3), p. 437-446
Publisher: Wiley-VCH Verlag GmbH & Co KGaA
Place of Publication: Germany
ISSN: 1522-2624
Field of Research (FOR): 050304 Soil Chemistry (excl Carbon Sequestration Science)
070306 Crop and Pasture Nutrition
Socio-Economic Objective (SEO): 820402 Rice
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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