Uptake of silicon by sugarcane from applied sources may not reflect plant-available soil silicon and total silicon content of sources

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dc.citation.doiDOI: 10.3389/fpls.2017.00760en_ZA
dc.contributor.authorKeeping, M.G.
dc.date.accessioned2017-10-04T08:31:16Z
dc.date.available2017-10-04T08:31:16Z
dc.date.issued2017-05
dc.description.abstractSoils of the tropics and sub-tropics are typically acid and depleted of soluble sources of silicon (Si) due to weathering and leaching associated with high rainfall and temperatures. Together with intensive cropping, this leads to marginal or deficient plant Si levels in Si-accumulating crops such as rice and sugarcane. Although such deficiencies can be corrected with exogenous application of Si sources, there is controversy over the effectiveness of sources in relation to their total Si content, and their capacity to raise soil and plant Si concentrations. This study tested the hypothesis that the total Si content and provision of plant-available Si from six sources directly affects subsequent plant Si uptake as reflected in leaf Si concentration. Two trials with potted cane plants were established with the following Si sources as treatments: calcium silicate slag, fused magnesium (thermo) phosphate, volcanic rock dust, magnesium silicate, and granular potassium silicate. Silicon sources were applied at rates intended to achieve equivalent elemental soil Si concentrations; controls were untreated or lime-treated. Analyses were conducted to determine soil and leaf elemental concentrations. Among the sources, calciumsilicate produced the highest leaf Si concentrations, yet lower plant-available soil Si concentrations than the thermophosphate. The latter, with slightly higher total Si than the slag, produced substantially greater increases in soil Si than all other products, yet did not significantly raise leaf Si above the controls. All other sources did not significantly increase soil or leaf Si concentrations, despite their high Si content. Hence, the total Si content of sources does not necessarily concur with a product’s provision of soluble soil Si and subsequent plant uptake. Furthermore, even where soil pH was raised, plant uptake from thermophosphate was well below expectation, possibly due to its limited liming capacity. The ability of the calcium silicate to provide Si while simultaneously and significantly increasing soil pH, and thereby reducing reaction of Si with exchangeable Al3+, is proposed as a potential explanation for the greater Si uptake into the shoot from this source.en_ZA
dc.description.librarianEM2017en_ZA
dc.identifier.citationKeeping M.G. 2017. Uptake of silicon by sugarcane from applied sources may not reflect plant-available soil silicon and total silicon content of sources. FRONTIERS IN PLANT SCIENCE 8, Article Number 760.en_ZA
dc.identifier.issn1664-462X (Online)
dc.identifier.urihttp://hdl.handle.net/10539/23225
dc.journal.titleFRONTIERS IN PLANT SCIENCEen_ZA
dc.journal.volume8en_ZA
dc.language.isoenen_ZA
dc.publisherFrontiers Media S.A.en_ZA
dc.rights© 2017 Keeping. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).en_ZA
dc.subjectAcid soilsen_ZA
dc.subjectAluminumen_ZA
dc.subjectCalcium silicateen_ZA
dc.subjectLimingen_ZA
dc.subjectPlant stressen_ZA
dc.subjectSilicon uptakeen_ZA
dc.subjectSoil pHen_ZA
dc.subjectThermophosphateen_ZA
dc.titleUptake of silicon by sugarcane from applied sources may not reflect plant-available soil silicon and total silicon content of sourcesen_ZA
dc.typeArticleen_ZA
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