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https://hdl.handle.net/2440/102215
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Type: | Journal article |
Title: | Placement and source effects of phosphate fertilizers on phosphorus availability and reaction products in two reduced-till soils: a greenhouse study |
Author: | Khatiwada, R. Hettiarachchi, G. Mengel, D. Fei, M. |
Citation: | Soil Science: an interdisciplinary approach to soils research, 2014; 179(3):141-152 |
Publisher: | Lippincott Williams & Wilkins |
Issue Date: | 2014 |
ISSN: | 0038-075X 1538-9243 |
Statement of Responsibility: | R. Khatiwada, G.M. Hettiarachchi, D.B. Mengel, and M. Fei |
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 vs. 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 and synchrotron-based X-ray absorption near-edge structure 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 X-ray absorption near-edge structure 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, scanning electron microscope with energy-dispersive X-ray 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. |
Keywords: | Phosphorus; phosphorus speciation; reduced tillage; phosphorus placement; X-ray absorption near-edge structure spectroscopy |
Rights: | Copyright © 2014 Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited |
DOI: | 10.1097/SS.0000000000000055 |
Published version: | http://ovidsp.tx.ovid.com/sp-3.22.1b/ovidweb.cgi?QS2=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 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 3 |
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