In May 1997, a project was implemented at the ANC Mayerthorpe site to determine whether the sludges can economically replace a portion or all of a commercial fertilizer application to achieve a target yield. The three-year treatment included replicated treatments of barley with:
- A one time sludge application of 50 t/ha in 1997
- Fertilizer application of 200 kg/ha 35-15-0 applied annually in the spring of 1997, 1998, and 1999.
- One time sludge application resulted in plant available nitrogen levels similar to those supplied by annual fertilizer application.
- Fertilizer nitrogen added in the spring of each year was utilized by the barley crop by the time the harvest was completed
- The sludge released adequate amounts of nitrogen to sustain the crop yields 3 years after application.
*Fertilizer - 200 kg/ha of 35-15-0 fertilizer applied annually
**Sludge - One time application of 50 t/ha in May, 1997
May 12, 1997
|May 20, 1997||59||140|
|Aug 27, 1997||56||43|
|April 30, 1998||149||50|
|May 8, 1998||-||165|
|Aug 14, 1998||53||41|
|May 25, 1999||68||35|
|May 26, 1999||-||177|
|Aug 27, 1999||22||36|
- The yield results over a three year period (1997 to 1999) demonstrated that a one time sludge application of 50 t/ha would result in the same barley yield as the application of 200 kg/ha 35-15-0 annually, indicating cost savings associated with annual fertilizer applications.
- The feed quality of the grain and straw was similar for both the fertilized and sludge amended treatments.
- Barley yields were similar for the two treatments over the three year period.