124-1 Effect of Solid Cattle Manure Application Rate and Placement Method On Supply Rates of Phosphate and Nitrate At the Surface of a Black Chernozem In East-Central Saskatchewan.

See more from this Division: S04 Soil Fertility & Plant Nutrition
See more from this Session: Phosphorus and Potassium Management: I
Monday, October 17, 2011: 8:05 AM
Henry Gonzalez Convention Center, Room 213B, Concourse Level
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Thomas King and Jeffrey Schoenau, 51 Campus Drive, University of Saskatchewan, Saskatoon, SK, CANADA

Placement of solid cattle manure (SCM) may influence the supply of inorganic nutrient ions at the soil surface that are available for biological uptake and interaction with run-off water. The objective of this study was to determine the effect of different SCM placement methods on soil PO4 P and NO3-N supply rates at the soil surface over two growing seasons. Anion exchange membrane probes (PRS) were inserted at a depth of 1 cm for a 2 hr period every 2 weeks over an 8 week period in plots that had SCM applied in the spring at 60 t ha-1 using broadcast alone, broadcast and incorporated and subsurface injection placement methods. During the first 30 days after seeding, the application of SCM significantly (p≤0.10) increased the supply of P compared to control treated plots. In subsurface injection treatment in 2008, the soil PO4-P supply increased from 1.17 g P cm-2 2hr-1 immediately following seeding operations to 2.12 g P cm-2 2hr-1 six weeks after seeding. Overall, there was no significant effect of placement method on surface soil phosphate supply. Eight weeks after seeding in 2009, soil NO3-N supply rates ranged from 0.45 g NO3-N cm-2 2hr-1 in the broadcast alone treatment to 0.92 g NO3-N cm-2 2hr-1 in the subsurface banded treatment. Placement of SCM in subsurface bands resulted in higher supply rates of NO3-N compared to other placement methods possibly due to enhanced mineralization when manure is placed below the surface.