A new slow-releasing iron fertilizer |
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Authors: | Partha K Chandra Kunal Ghosh Chandrika Varadachari |
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Affiliation: | aRaman Centre for Applied and Interdisciplinary Sciences, 16A Jheel Road, Calcutta 700 075, India;bDepartment of Agricultural Chemistry & Soil Science, University of Calcutta, 35 BC Road, Calcutta 700 019, India |
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Abstract: | This paper describes the development of an environment-friendly, slow-release fertilizer of the micronutrient iron. The compound is water insoluble, and is based on a polymeric phosphate structure. Kinetics and solubility of products in the goethite FeO(OH)]–H3PO4 and FeO(OH)]–MgO–H3PO4 systems were studied at 170–300 °C. Polymerization patterns were complex. The presence of Mg as additive, improved product properties. The fertilizer was prepared by polymerization of goethite, magnesium oxide and phosphoric acid to an optimized chain length at 200 °C, followed by neutralization with magnesia. The fertilizer was soluble in citrate and DTPA. A significant increase in the yield of wheat and uptake of iron was observed at a dosage of 2 kg/ha Fe as the slow-release fertilizer. |
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Keywords: | Micronutrient Iron Polyphosphate Slow-release Water insoluble XRD |
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