Plant and Soil

, Volume 337, Issue 1–2, pp 243–258 | Cite as

Prediction of wheat response to an application of phosphorus under field conditions using diffusive gradients in thin-films (DGT) and extraction methods

  • Sean Mason
  • Ann McNeill
  • Mike J. McLaughlin
  • Hao Zhang
Regular Article

Abstract

The ability of the Diffusive Gradients in Thin Films (DGT) technique and two other established testing methods (Colwell, resin) to predict wheat responsiveness to applied P from 35 field trials across southern Australia was investigated. Regression analysis of relative early dry matter production and grain yield responses demonstrated that the DGT method predicted plant responsiveness to applied P more accurately than Colwell P and resin P at sites where maximum yields were reached with P rates used (20 out of 35). The measured concentration in soils at the DGT surface, CDGT, explained 74% of the variation in response for both early dry matter and grain, compared to 7% for early dry matter and 35% for grain using the resin P method. No significant relationships could be obtained for Colwell P although modifying the Colwell test data using Phosphorus Buffering Index resulted in a correct response prediction for 11 of the 20 field sites compared to 18 for DGT and 14 for resin P. These observations suggest that the DGT technique can assess plant available P in soils with significantly greater accuracy than traditional soil P testing methods. The critical P threshold, expressed as CDGT, was 255 μg L−1 for early dry matter and 66 μg L−1 for grain.

Keywords

Nutrient availability Phosphorus deficiency Soil testing Soil fertility 

Abbreviations

DGT

Diffusive Gradients in Thin-Films

PBI

Phosphorus Buffering Index

AEM

Anion Exchange Membrane

WHC

Water Holding Capacity

ICP-MS

Inductively Coupled Plasma Mass Spectrometer

ICP-OES

Inductively Coupled Plasma Optical Emission Spectrometer

EC

Electrical Conductivity

MBL

Mixed Binding Layer

DI

Deionised

DM

Dry Matter

RY

Relative Yield

GS30

Growth Stage 30

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Sean Mason
    • 1
  • Ann McNeill
    • 1
  • Mike J. McLaughlin
    • 1
    • 2
  • Hao Zhang
    • 3
  1. 1.School of Earth and Environmental SciencesUniversity of AdelaideAdelaideAustralia
  2. 2.CSIRO Land and WaterGlen OsmondAustralia
  3. 3.Lancaster Environment CentreLancaster UniversityLancasterUK

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