Journal Article

Speciation and Distribution of Phosphorus in a Fertilized Soil: A Synchrotron-Based Investigation

Armstrong, R.D, Cutler, J.N, Paterson, D, Lombi, E, Scheckel, K.G, Forrester, S

2006

Overview

Phosphorus availability is often a limiting factor for crop production around the world. The efficiency of P fertilizers in calcareous soils is limited by reactions that decrease P availability; however, fluid fertilizers have recently been shown, in highly calcareous soils of southern Australia, to be more efficient for crop (wheat [Triticum aestivum L.]) P nutrition than granular products. To elucidate the mechanisms responsible for this differential response, an isotopic dilution technique (E value) coupled with a synchrotron-based spectroscopic investigation were used to assess the reaction products of a granular (monoammonium phosphate, MAP) and a fluid P (technical-grade monoammonium phosphate, TG-MAP) fertilizer in a highly calcareous soil. The isotopic exchangeability of P from the fluid fertilizer, measured with the E-value technique, was higher than that of the granular product. The spatially resolved spectroscopic investigation, performed using nano x-ray fluorescence and nano x-ray absorption near-edge structure (n-XANES), showed that P is heterogeneously distributed in soil and that, at least in this highly calcareous soil, it is invariably associated with Ca rather than Fe at the nanoscale. \"Bulk\" XANES spectroscopy revealed that, in the soil surrounding fertilizer granules, P precipitation in the form of octacalcium phosphate and apatite-like compounds is the dominant mechanism responsible for decreases in P exchangeability. This process was less prominent when the fluid P fertilizer was applied to the soil.

• Publisher: Soil Science Society of America,American Society of Agronomy
• Subject: ABSORPTION / Agronomy. Soil science and plant productions / AVAILABILITY / Biological and medical sciences / Calcareous soils / Calcium phosphates / cation exchange capacity / Cereal crops / chemical speciation / Chemicals / Crop production / CROPS / diffusion / DILUTION / DISTRIBUTION / Earth sciences / Earth, ocean, space / EFFICIENCY / ENVIRONMENTAL SCIENCES / Exact sciences and technology / exchangeable cations / fertilizer application / FERTILIZERS / FLUORESCENCE / Fundamental and applied biological sciences. Psychology / isotope dilution technique / J200 / J500 / liquid fertilizers / nutrient availability / NUTRITION / PHOSPHATES / PHOSPHORUS / phosphorus fertilizers / PRECIPITATION / PRODUCTION / Soil science / SOILS / South Australia / spatial distribution / Speciation / SPECTROSCOPY / Studies / Surficial geology / Triticum aestivum / WHEAT / X-ray absorption near-edge structure spectroscopy / X-ray fluorescence / X-rays