Sunflowers drive acid dissolution of rock phosphate when banded with ammonium zeolite

Fujinuma, R., Hunter, M. and Menzies, N. (2015). Sunflowers drive acid dissolution of rock phosphate when banded with ammonium zeolite. In: R. A. Criley, XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposium on Ornamental Horticulture in the Global Greenhouse. International Horticulture Congress, Brisbane, QLD, Australia, (21-27). 17-22 August 2014. doi:10.17660/ActaHortic.2015.1104.4


Author Fujinuma, R.
Hunter, M.
Menzies, N.
Title of paper Sunflowers drive acid dissolution of rock phosphate when banded with ammonium zeolite
Conference name International Horticulture Congress
Conference location Brisbane, QLD, Australia
Conference dates 17-22 August 2014
Proceedings title XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposium on Ornamental Horticulture in the Global Greenhouse   Check publisher's open access policy
Journal name Acta Horticulturae   Check publisher's open access policy
Place of Publication Leuven, Belgium
Publisher International Society for Horticultural Science
Publication Year 2015
Sub-type Fully published paper
DOI 10.17660/ActaHortic.2015.1104.4
Open Access Status Not Open Access
ISBN 9789462610903
ISSN 0567-7572
Editor R. A. Criley
Volume 1104
Start page 21
End page 27
Total pages 8
Language eng
Formatted Abstract/Summary
Ammonium exchanged clinoptilolite (zeolite) with rock phosphate (RP) has been known to accelerate the process of RP dissolution and enhance plant growth responses; however, the mechanism underlying accelerated RP dissolution remains unclear. The present study examined whether the discharge of protons by plant roots and, to a lesser extent, by soil bacteria drives RP dissolution in this system. A total of 14 combinations consists of P-source (rock phosphate or calcium orthophosphate), placement (vertical band or dispersed), exchanged zeolite (untreated or exchanged with NH4, K or Ca), and plant (with or without plant) were installed in 1-L pots containing peat and perlite. Growth responses of sunflower (Helianthus annuus L. ‘Hysun 25’) were greatest after 27 days in banded and dispersed orthophosphate treatments, but RP banded with ammoniated zeolite treatments yielded 20% less total leaf length. The pH of the soil solution in RP and ammoniated zeolite bands decreased by two units concomitant with a highly significant four-fold increase in solution P concentration. Root growth proliferated in RP and ammoniated zeolite bands. Sunflower growth was very slow in all other RP treatments with little change in pH or solution P concentration. These data indicate that P dissolution from RP was mainly plant driven by proton excretion following ammonium absorption. Hence, RP banded with ammoniated zeolite could be used as an efficient plant-driven controlled-release fertiliser in pot (container) plant culture.
Keyword Nitrogen
Phosphorus
Controlled release fertiliser
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collections: School of Agriculture and Food Sciences
Official 2016 Collection
 
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Created: Fri, 11 Mar 2016, 22:23:26 EST by Ryosuke Fujinuma on behalf of School of Agriculture and Food Sciences