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Relationship between phosphorus concentration in surface runoff and a novel soil phosphorus test procedure (DGT) under simulated rainfall

Citation

Dougherty, WJ and Mason, SD and Burkitt, LL and Milham, PJ, Relationship between phosphorus concentration in surface runoff and a novel soil phosphorus test procedure (DGT) under simulated rainfall, Soil Research, 49, (6) pp. 523-528. ISSN 1838-675X (2011) [Refereed Article]


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DOI: doi:10.1071/SR11151

Abstract

There is a need to be able to identify soils with the potential to generate high concentrations of phosphorus (P) in runoff, and a need to predict these concentrations for modelling and risk-assessment purposes. Attempts to use agronomic soil tests such as Colwell P for such purposes have met with limited success. In this research, we examined the relationships between a novel soil P test (diffuse gradients in thin films, DGT), Colwell P, P buffering index PBI), and runoff P concentrations. Soils were collected from six sites with a diverse range of soil P buffering properties, incubated for 9 months with a wide range of P additions, and then subjected to rainfall simulation in repacked trays growing pasture. For all soil and P treatment combinations, the relationship between DGT (010 mm) and runoff P was highly significant (P < 0.001, r2 = 0.84). Although there were significant curvilinear relationships between Colwell P and runoff P for individual soils, there were large differences in these relationships between soils. However, the inclusion of a P buffering measure (PBI) as an explanatory variable resulted in a highly significant model (P < 0.001, R2 = 0.82) that explained between-soil variability. We conclude that either DGT, or Colwell P and PBI, can be used to provide a relative measure of runoff P concentration.

Item Details

Item Type:Refereed Article
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Soil Chemistry (excl. Carbon Sequestration Science)
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Sparseland, Permanent Grassland and Arid Zone Land and Water Management
Author:Burkitt, LL (Dr Lucy Burkitt)
ID Code:72914
Year Published:2011
Web of Science® Times Cited:13
Deposited By:Agricultural Science
Deposited On:2011-09-04
Last Modified:2014-12-01
Downloads:0

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