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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Tarlok Singh Sahota
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DOI:10.17265/2161-6264/2023.02.001
Lakehead University Agricultural Research Station (LUARS), Thunder Bay, Ontario, Canada
Spring canola (Brasica napus L.) would become an important oilseed crop adapted to the Northwestern Ontario cropping systems. Newly released high yielding varieties have a potential for higher seed yield as long as nitrogen (N) does not become a limiting factor. Urea, the main N fertilizer source, does not have the ability to sustain N requirements throughout the growing season, and Environmentally Smart Nitrogen (ESN), a polymer-coated urea, alone might release N too slowly during the colder spring. Both of these two N sources could be a more environmentally sustainable mixture to provide the higher rates of N needed for the highest yielding canola varieties. A plant growth regulator (PGR) applied at the four to six leaf stages could help reduce the excessive vegetative growth at higher rates of N. Field studies in a randomized complete block design conducted over three years (2016-2017-2018) at the Lakehead University Agricultural Research Station in Thunder Bay, Northwestern Ontario, were used to evaluate the impacts of urea and urea + ESN at different rates, with or without the addition of a PGR (chlormequat chloride) on the seed yield, biomass yield, harvest index seed nutrient utilization efficiency, plant height, lodging, days to flower and maturity of Canola. Canola seed yield was highly responsive to increased N fertilizer rates in the three years for both sources of N. The highest canola seed yield response was determined at N rate 240 kg/ha from urea producing ~9,600 kg/ha seed and at N rate 180 kg/ha urea + ESN producing ~9,000 kg/ha seed. Averaged over three years, urea + ESN @ 180 kg N/ha produced 600 kg/ha more canola seed yield than urea @ 180 kg N/ha. The PGR had no effect on canola height and reduced biomass production in two of the three years. Focusing on the costs of N fertilizers, using urea or a mixture of urea + ESN over a PGR is preferable to achieve the economic benefit.
Canola, nitrogen management, PGR, urea, ESN, Northwestern Ontario.
Sahota, T. S. 2023. "Influence of Nitrogen Sources or Plant Growth Regulator on Improving Spring Canola Yield in Northwestern Ontario." Journal of Agricultural Science and Technology B 13 (2023): 27-40.
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