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Temporal patterns of infiltration into a water repellent soil under field conditions

Temporal patterns of infiltration into a water repellent soil under field conditions. Plant Industry / Sustainable Agriculture flagship. Phil Ward, Margaret Roper, Ramona Jongepier and Shayne Micin. April 28, 2014. Water repellency in south-western Australia. Hopetoun. DAFWA: agric.wa.gov.au.

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Temporal patterns of infiltration into a water repellent soil under field conditions

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  1. Temporal patterns of infiltration into a water repellent soil under field conditions Plant Industry / Sustainable Agriculture flagship Phil Ward, Margaret Roper, Ramona Jongepier and Shayne Micin April 28, 2014

  2. Water repellency in south-western Australia Hopetoun DAFWA: agric.wa.gov.au Infiltration into water repellent soil| Phil Ward

  3. Climate averages 1981-2010 Infiltration into water repellent soil| Phil Ward

  4. Landscape Infiltration into water repellent soil| Phil Ward

  5. Trial details 2011 (canola) - 2012 (wheat) • Zero-till versus full cultivation • Residue retained versus residue burnt • 4 replicates • Tillage and burning: 12 April 2011 and 15 April 2012 • Seeding 21 April 2011 (canola), and 14 May 2012 (wheat) • Plot size 12 m x 20 m • Crops sown between rows of previous crop – 30 cm row spacing • Measurements: • Soil carbon and water repellency (MED) ~ 6 times per year • Soil water content 0-12 cm ~ 6 times per year • Soil water content at 5 cm, at 15-minute intervals, in two replicates. 16 plots,commenced in 2008 Infiltration into water repellent soil| Phil Ward

  6. Soil water repellency 0-5 cm – Feb 2013at the conclusion of the experiment Infiltration into water repellent soil| Phil Ward

  7. TDR, in crop row and inter-row positions Residue burnt, soil cultivated Residue retained, zero-till Infiltration into water repellent soil| Phil Ward

  8. All the data... Approx. drained upper limit Approx. crop lower limit Infiltration into water repellent soil| Phil Ward

  9. July 28, 2011 – rain on wet soil7.8 mm Approx. crop lower limit Total DS (mm) 7.3 7.1 6.1 6.2 Approx. crop lower limit Infiltration into water repellent soil| Phil Ward

  10. June 7, 2012 – dry(ish) soil 7.0 mm Total DS (mm) 6.0 2.2 4.9 4.5 Infiltration into water repellent soil| Phil Ward

  11. October 2, 2011 – canola 11.2 mm Total DS (mm) 9.3 6.4 5.8 4.7 Infiltration into water repellent soil| Phil Ward

  12. September 27, 2012 – wheat 13.0 mm Total DS (mm) 6.8 3.2 5.1 5.8 Infiltration into water repellent soil| Phil Ward

  13. March 19, 2012 – rain on dry soil 7.2 mm Total DS (mm) 8.1 4.1 7.9 4.3 Infiltration into water repellent soil| Phil Ward

  14. Conclusions • On wet soils, residue and tillage treatments have little effect on patterns of infiltration. • Infiltration into dry WR sand is affected in both timing and magnitude by previous soil disturbance and arrangement of vegetation • Tillage destroys previous preferred pathways and can perturb infiltration patterns for at least 11 months. • Accounting for rainfall can be used as a measure of field expression of water repellence • Tillage in agricultural crop production should be carefully managed in water repellent sands. Infiltration into water repellent soil| Phil Ward

  15. Thank you • Plant Industry / Sustainable Agriculture Flagship

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