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https://hdl.handle.net/2440/1997
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Type: | Journal article |
Title: | Mobility and lability of phosphorus from granular fluid monoammonium phosphate differs in a calcareous soil |
Author: | Lombi, E. McLaughlin, M. Johnston, C. Armstrong, R. Holloway, R. |
Citation: | Soil Science Society of America Journal, 2004; 68(2):682-689 |
Publisher: | Soil Sci Soc Amer |
Issue Date: | 2004 |
ISSN: | 0361-5995 1435-0661 |
Statement of Responsibility: | E. Lombi, M. J. McLaughlin, C. Johnston, R. D. Armstrong and R. E. Holloway |
Abstract: | Phosphorus availability is a major factor limiting crop production in highly calcareous soils. Recent field trials on calcareous soils in southern Australia have shown that fluid fertilizers may provide a useful alternative to granular fertilizer products. Fluid sources of P enhance P uptake and yield when compared with granular fertilizers applied at the same rate. This work aimed to compare the behavior of one fluid (technical grade monoammonium phosphate, TG-MAP) and one granular (monoammonium phosphate, MAP) form of P fertilizer in a highly calcareous soil. Changes in soil pH, P diffusion, solubility, and lability (using isotopic dilution techniques) were determined at different distances from the point of application over 5 wk. Furthermore, reaction products in MAP granules were investigated using spectroscopic techniques. The results indicated that P from fluid TG-MAP diffused more and was more available than P supplied as granular MAP. Also, X-ray diffraction (XRD) and energy dispersive X-ray microanalyses (EDXMA) of the MAP granules indicated that a significant percentage (12%) of the initial P remained in the granules even after 5 wk of incubation in the soil. The enhanced P availability of fluid fertilizers observed in field trials compared with granular forms is discussed in relation to differences in the dissolution, diffusion, and reaction processes in soils. |
Rights: | © 2004 Soil Science Society of America |
DOI: | 10.2136/sssaj2004.6820 |
Published version: | http://soil.scijournals.org/cgi/content/abstract/68/2/682 |
Appears in Collections: | Aurora harvest 2 Earth and Environmental Sciences publications Environment Institute publications |
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