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365. Anon.. 1990. Canola's sulfur requirements.. Agrichemical Age, February 1990 p. 24-25.
Experience from western Canada indicates the importance of proper sulfur fertilization for rotations including canola. Canola has a high sulfur requirement. A 35 bu. canola crop removes 20-25 lb S/ac, about twice that of a 50 bu. wheat crop. Canola is highly responsive to sulfur fertilization. Soil testing can help determine S needs, as can early season tissue testing. Researchers suggest that the tissue contain one part S for every 7 parts N. Sulfur deficiency symptoms in most crops first appear on younger, upper leaves. Signs unique to canola are delayed and prolonged flowering; pale, whitish flowers; erect leaves on the upper part of the plant; young leaves cup inward and develop a pink, reddish or even purple color on the underside; seed pods will be small and poorly filled.