More Nitrogen & Polymer Coated Phosphorous

November 1, 2013

Nitrogen dynamics

Principal investigator: Robert Blackshaw, Agriculture and Agri-Food Canada, Lethbridge, AB

Collaborators: Xiying Hao, Neil Harker, John O’Donovan, Eric Johnson, and Cecil Vera

Published: Blackshaw, R. E., X. Hao, R. N. Brandt, G.W. Clayton, K. N. Harker, J. T. O’Donovan, E. N. Johnson. and C. L. Vera. 2011. “Canola Response to ESN and Urea in a Four-Year No-Till Cropping System.” Agronomy Journal. 103:92-99. Li, C., X. Hao, R. E. Blackshaw, J. T. O’Donovan, K. N. Harker, and G. W. Clayton. 2012.

“Nitrous oxide emissions in response to ESN and urea, herbicide management, and canola cultivar in a no-till cropping system.” Soil and Tillage Research 118:97-106.

Both hybrid and open-pollinated canola responded positively to higher nitrogen fertilizer rates in about 50 percent of the cases. The study also looked at the relationship between nitrogen and weeds, finding that weed tissue nitrogen concentration was often lower with ESN than with urea, indicating that crop-weed competition for soil N might be reduced if ESN were utilized.

Robert Blackshaw with Agriculture and Agri-Food Canada (AAFC) led a multi-year study to determine the merits of polymercoated urea (specifically Environmentally Smart Nitrogen (ESN) from Agrium) compared with standard urea on weed management and yield of hybrid and open-pollinated (OP) canola. Information from the study will be used to develop improved fertilization strategies for canola production on the semiarid Prairies.

Impact of Traditional and Enhanced Efficiency Phosphorus Fertilizers on Canola Emergence, Yield, Maturity and Quality

Principal investigator: Cynthia Grant, Agriculture and Agri-Food Canada, Brandon, MB

Collaborators: Jo-Anne Relf-Eckstein, Rong Zhou

The enhanced efficiency phosphorus fertilizers evaluated in this study provided little economic benefit compared to traditional monoammonium phosphate (MAP) or ammonium polyphosphate (APP) fertilizers. The polymer coated controlled-release MAP (CRP) product may reduce the risk of seedling toxicity if it is necessary to exceed safe levels of seed-placed phosphorus (P) fertilizer to optimize crop yield.

Cynthia Grant with Agriculture and Agri-Food Canada (AAFC) led field studies from 2008 to 2010 to evaluate the effect of various enhanced efficiency P fertilizers on seedling toxicity, yield and quality of canola.

Open the PDF to read the entire research summary from the 2013 Science Issue of Canola Digest

You can also read the 2013 Science Issue of Canola Digest as a flipbook

Visit the Canola Research Hub website to search the database of grower funded research

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