Canola (Brassica napus) production in Oklahoma has sharply increased in recent years due to its benefits as a winter rotation crop for continuous wheat producers. However, limited research exists about sulfur requirements of canola in the Southern Great Plains and producers are being encouraged to apply S regardless of soil test results. The objectives of this two‐year study were to evaluate the effect of two sources of S and four application rates of 0, 11.2, 22.4, and 33.6 kg/ha on yield, seed oil content, and tissue N and S concentrations of two canola cultivars. Field experiments were conducted during the 2009‐2010 and 2010‐2011 growing seasons in Lahoma and Perkins, OK. In 2009 and 2010, the combined average total soil sulfate sulfur for the experimental site was 48 and 63 kg/ha at Perkins and 51 and 108 kg/ha at Lahoma, respectfully. There were no statistical yield differences between S sources and among rates for either canola cultivar over both growing seasons. The lack of canola yield and oil content response to applied S was probably due to the adequate supply of sulfate sulfur in the soil. Therefore, it is important to take soil samples before deciding if S fertilizer is needed.
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