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https://hdl.handle.net/2440/64266
Type: | Conference paper |
Title: | Expanding the use of diffusive gradients in thin-films (DGT) for assessing phosphorus requirements of different crop types |
Author: | Mason, S. McNeill, A. McLaughlin, M. |
Citation: | Proceedings of the 15th Australian Agronomy Conference (AAC): Food Security from Sustainable Agriculture / H. Dove and R. A. Culvenor (eds.), 15-18 November, 2010; pp.1-4 |
Publisher: | ASA |
Publisher Place: | Australia |
Issue Date: | 2010 |
Conference Name: | Australian Agronomy Conference (15th : 2010 : Lincoln, New Zealand) |
Statement of Responsibility: | Sean Mason, Ann McNeill and Mike J. McLaughlin |
Abstract: | The DGT soil test for assessing plant-available phosphorus (P) in soil has now been calibrated over three growing seasons using field-based P response trials across a range of crops (wheat, barley, canola and peas). Regression analysis of relative early dry matter production and grain yield responses demonstrated that the DGT method predicted wheat responsiveness to applied P more accurately than Colwell P and resin P. Using regression the DGT method explained 75 % of the variation in response for early dry matter and 74 % for grain. No other significant regression relationships were obtained for the other soil tests, apart from resin P which explained 40 % of the variation in response for grain. The performance of the Colwell-P test was assessed after modification using the phosphorus buffering index (PBI) and correctly predicted the crop response to P for 17 of the 30 experiments, compared to 20/30 for resin P and 26/31 for DGT. These observations suggest that the DGT technique can assess plant available P in soils with significantly greater accuracy than traditional soil P testing methods. Phosphorus response trials with other crop types including barley, canola, field peas and chickpeas have shown that different crop types have varying abilities to utilise residual P in the soil. Importantly DGT has consistently been the most accurate method for predicting P response for each of these crop types. |
Keywords: | Nutrient availability phosphorus deficiency soil testing soil fertility |
Rights: | © 2010 Australian Society of Agronomy. All Rights Reserved |
Published version: | http://www.regional.org.au/au/asa/2010/crop-production/nitrogen-phosphorus/7166_masonsd.htm |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 5 Environment Institute publications |
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