Use of > 1 : 1 chelator: Iron ratios and strong iron(III) chelators in hydroponic solutions for barley

Bell, Paul F., Kerven, G. L., Edwards, D. G. and Asher, C. J. (2005) Use of > 1 : 1 chelator: Iron ratios and strong iron(III) chelators in hydroponic solutions for barley. Journal Of Plant Nutrition, 28 6: 981-989. doi:10.1081/PLN-200058891


Author Bell, Paul F.
Kerven, G. L.
Edwards, D. G.
Asher, C. J.
Title Use of > 1 : 1 chelator: Iron ratios and strong iron(III) chelators in hydroponic solutions for barley
Journal name Journal Of Plant Nutrition   Check publisher's open access policy
ISSN 0190-4167
1532-4087
Publication date 2005-01-01
Sub-type Article (original research)
DOI 10.1081/PLN-200058891
Volume 28
Issue 6
Start page 981
End page 989
Total pages 9
Place of publication Philadelphia, PA, United States
Publisher Taylor and Francis
Collection year 2005
Language eng
Subject C1
300103 Soil Chemistry
620102 Barley
Formatted abstract
This study examined two guidelines for preparing hydroponic solutions to ensure adequate iron (Fe) for Poaceae plants: (1) not to add chelator in excess of Fe concentrations and (2) to use only weaker forms of Fe(III) chelators. Barley was grown in low-Fe solutions for 9 d and transferred to 59Fe-spiked nutrient solutions at pH 8.1 containing ligand:Fe μ M concentrations of 30:10, 200:10, and 500:10 for 6 h assays. Shoot 59Fe increased with increasing citrate or N,N-bis(carbozymethyl)glycine (NTA). Shoot 59Fe was higher from treatment with citrate than with corresponding NTA treatments despite the ligands' similar Fe(III) binding affinity. Soluble Fe was higher from the citrate than the NTA solutions at the two highest chelator concentrations (P < 0.05). Citrate maintained higher soluble Fe levels and provided more Fe to barley than did NTA. Results of the second experiment found adequate Fe in barley when grown in equimolar HBED:Fe treatments (HBED is the strongest Fe(III) synthetic chelator). Recommendations that only weak Fe(III) chelators be used for the hydroponic culture of barley may be made because stronger chelators result in inadequate Fe for plants after solution Fe levels drop, as plants remove only Fe and little chelator from hydroponic solutions.
Keyword Plant Sciences
Free-ion Model
Hydroponics
Solution Culture
Iron Deficiency
Acid
Citrate
Nutrition
Mechanism
Toxicity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 15 Aug 2007, 16:03:03 EST