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Published online 17 July 2007
Published in J Environ Qual 36:1281-1288 (2007)
DOI: 10.2134/jeq2006.0347
© 2007 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sources of Phosphorus Lost from a Grazed Pasture Receiving Simulated Rainfall

R. W. McDowella,*, D. M. Nashb and F. Robertsonc

a AgResearch Limited, Invermay Agricultural Centre, Private Bag 50034, Mosgiel, New Zealand
b Victorian Dep. of Primary Industries–Ellinbank, RMB 2460 Hazeldean Road, Ellinbank, Victoria 3821, Australia and e-Water CRC, Univ. of Canberra, ACT 2601, Australia
c Victorian Dep. of Primary Industries–Hamilton, Mount Napier Road, Hamilton, Victoria 3300, Australia


Figure 1
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  		Fig. 1. Variation in the mean time to overland flow, the mean time taken to generate 1.5 L of flow and mean suspended sediment concentration with time since the start of the experiment. Bars represent the standard error of the mean. The number of asterisks indicates significance of line fit: *, **, *** are P < 0.05, P < 0.01, and P < 0.001, respectively.

 

Figure 2
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  		Fig. 2. Variation in the mean concentration of P fractions with time since the start of the experiment. Bars represent the standard error of the mean. The number of asterisk indicates significance of line fit: *, **, *** are P < 0.05, P < 0.01, and P < 0.001, respectively.

 

Figure 3
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  		Fig. 3. Modeled load of P lost in overland flow from events measured during 2002 and 2003 for a dairy cattle grazed trial in Southland, New Zealand. Arrows indicate when superphosphate fertilizer was applied in September each year.

 




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Copyright © 2007 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.