Evaluation of industrial wastes as sources of fertilizer silicon using chemical extractions and plant uptake

Haynes, Richard J., Belyaeva, O. N. and Kingston, G. (2013) Evaluation of industrial wastes as sources of fertilizer silicon using chemical extractions and plant uptake. Journal of Plant Nutrition and Soil Science, 176 2: 238-248. doi:10.1002/jpln.201200372


Author Haynes, Richard J.
Belyaeva, O. N.
Kingston, G.
Title Evaluation of industrial wastes as sources of fertilizer silicon using chemical extractions and plant uptake
Journal name Journal of Plant Nutrition and Soil Science   Check publisher's open access policy
ISSN 1436-8730
1522-2624
Publication date 2013-04-01
Year available 2013
Sub-type Article (original research)
DOI 10.1002/jpln.201200372
Open Access Status Not Open Access
Volume 176
Issue 2
Start page 238
End page 248
Total pages 11
Place of publication Weinheim, Germany
Publisher Wiley - VCH
Language eng
Formatted abstract
Six inorganic industrial-waste materials (coal fly ash, bauxite-processing mud, steel slag, two samples of air-cooled blast furnace [BF] slag, and one sample of water-cooled BF slag), along with wollastonite, were evaluated as fertilizer-Si sources. Evaluation was carried out by analyzing total and extractable Si fractions in the materials, by incubating them at two rates with a Si-deficient soil and measuring potentially available extractable Si and by measuring yield and Si uptake by two successive rice crops grown in the fertilized soils. Of the waste materials used, fly ash had the highest total Si content (29%) but a negligible quantity was present in extractable forms. Steel slag and bauxite-processing mud had only 5%–7% Si content while BF slags contained 14%–18% Si. All materials, other than fly ash, increased the amount of extractable Si present in the soil. Additions of steel slag and bauxite-processing mud caused greater increases in Si extractability than the air-cooled BF slags while water-cooled BF slag–treated soils contained notably high acid-extractable Si. Because of the alkaline nature of the materials, and their reaction products, there was a positive relationship between extractable soil Si and soil pH. However, an equilibration experiment using NaSiO3 as the Si source confirmed that Si solubility in the soil decreased with increasing pH. Dry-matter yields of rice, at the lower rate of Si addition, were increased by all treatments other than fly ash. The higher rates of steel slag and bauxite-processing mud caused yield depressions. Total Si uptake by rice was increased by all treatments, other than fly ash, and was greater at the higher rate of Si addition. It was concluded that the BF slags are the most effective waste materials as fertilizer-Si sources and that, in slag-amended soils, CaCl2 and NH4 acetate are the most reliable soil-test extractants.
Keyword Silicon fertilizers
Rice
Silicon soil tests
Blast furnace slag
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2014 Collection
 
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