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Pot evaluation of synthetic nanosiderite for the prevention of iron chlorosis
Author(s) -
SánchezAlcalá Inmaculada,
del Campillo María C,
Barrón Vidal,
Torrent José
Publication year - 2012
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.5569
Subject(s) - chlorosis , goethite , lepidocrocite , siderite , calcareous , chemistry , environmental chemistry , agronomy , mineralogy , geology , calcite , paleontology , organic chemistry , adsorption , biology
BACKGROUND: Iron chlorosis is a problem that affects crops grown on calcareous soils. In this work, we assessed the effectiveness of nanosized siderite (FeCO 3 ) to prevent iron chlorosis, the underlying hypothesis being that the oxidation products of siderite in soil are poorly crystalline, and hence plant‐available, iron oxides. RESULTS: Nanosized siderite was prepared by mixing FeSO 4 and K 2 CO 3 solutions, either pure or doped with phosphate (siderite SID and SIDP, respectively). The average specific surface area was ∼140 m 2 g −1 for SID and ∼220 m 2 g −1 for SIDP. Experimental oxidation in a calcite suspension yielded goethite for SID and a mixture of lepidocrocite and goethite for SIDP. Two pot experiments in which a SID or SIDP suspension was applied to a calcareous soil at a rate of ∼2 g Fe kg −1 showed nanosiderite to prevent iron chlorosis in chickpea. In a pot experiment with five successive crops, one initial application of ∼0.7 g Fe kg −1 soil in the form of SID or SIDP was as effective as FeEDDHA in preventing Fe chlorosis. The residual effect of nanosiderite when applied to the first crop alone clearly exceeded that of FeEDDHA. CONCLUSION: Nanosiderite suspensions applied at rates of ∼0.7 g Fe kg −1 soil were highly effective in preventing iron chlorosis and have a great residual effect. Copyright © 2012 Society of Chemical Industry