Placement and source effects of phosphate fertilizers on phosphorus availability and reaction products in two reduced-till soils: A greenhouse study

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dc.contributor.author Khatiwada, Raju
dc.contributor.author Hettiarachchi, Ganga M.
dc.contributor.author Mengel, David B.
dc.contributor.author Fei, Mingwei
dc.date.accessioned 2015-05-18T11:55:49Z
dc.date.available 2015-05-18T11:55:49Z
dc.date.issued 2015-05-18
dc.identifier.uri http://hdl.handle.net/2097/19250
dc.description.abstract Crop yields are limited primarily by unavailability of nutrients in agricultural soil. Adoption of reduced tillage and no-tillage systems leads to stratification of nutrients in surface soil, so management of phosphorus (P) in these systems is a major issue. The objective of this research was to understand the influence of placement (broadcast vs. deep-placed P) and fertilizer source (granular versus liquid P) on the reaction products of P under greenhouse conditions using soil columns. Phosphorus was added at a rate of 75 kg/ha to two soils: an acid soil from Manhattan, KS, and a slightly acid to neutral soil from Ottawa, KS. At 5 weeks after P application soil pH, resin-extractable P, and speciation of P in soils were determined at different distances from the point of fertilizer application. Scanning electron microscope with energy dispersive X-ray analysis(SEM-EDXA) and synchrotron-based X-ray absorption near-edge structure (XANES) spectroscopy were used to understand P speciation. Results for P fertilizer sources and placement with respect to resin-extractable P showed no clear differences between the treatments except for granular broadcast and granular deep-placed treatments in the Ottawa soil.Reaction products formed after application of P in two soils showed some clear differences. The XANES speciation revealed that Fe-P-like forms dominated in the acidic soil, whereas adsorbed and Fe and Ca-P-like forms dominated in the neutral to slightly acid soil. No clear trends in reaction products were detected with respect to P source or the P placement method. Furthermore, SEM-EDXA analysis of incubated fertilizer granules extracted from soils at 5 weeks showed enrichment of Al, Fe, and Ca in the zones of remaining P in incubated granules, indirectly indicating that these cations enter and or remaining in the granules and begin to react with P before the granules dissolve completely. en_US
dc.language.iso en_US en_US
dc.relation.uri http://journals.lww.com/soilsci/Abstract/2014/03000/Placement_and_Source_Effects_of_Phosphate.4.aspx en_US
dc.rights This is a non-final version of an article published in final form in (Khatiwada, R., Hettiarachchi, G. M., Mengel, D. B., & Fei, M. (2014). Placement and source effects of phosphate fertilizers on phosphorus availability and reaction products in two reduced-till soils: A greenhouse study. Soil Science, 179(3), 141-152.) Retrieved from http://journals.lww.com/soilsci/Abstract/2014/03000/Placement_and_Source_Effects_of_Phosphate.4.aspx. en_US
dc.subject Phosphorus en_US
dc.subject Phosphorus speciation en_US
dc.subject Reduced tillage en_US
dc.subject Phosphorus placement en_US
dc.subject X-ray absorption near edge structure spectroscopy en_US
dc.title Placement and source effects of phosphate fertilizers on phosphorus availability and reaction products in two reduced-till soils: A greenhouse study en_US
dc.type Article (author version) en_US
dc.date.published 2014 en_US
dc.citation.doi 10.1097/SS.0000000000000055 en_US
dc.citation.epage 152 en_US
dc.citation.issue 3 en_US
dc.citation.jtitle Soil Science en_US
dc.citation.spage 141 en_US
dc.citation.volume 179 en_US
dc.contributor.authoreid ganga en_US
dc.contributor.authoreid dmengel en_US


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