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Sulfur Nutrition of Rapeseed II. Effect of Time of Sulfur Application¹

ABSTRACT

A growth chamber pot experiment was conducted to compare the efficiency of ³⁵S labeled sulfate applied at various stages of growth (at seeding, rosette, bud, and flowering stages) in rapeseed grown on S-deficient soils. Plant uptake of fertilizer S was generally higher when S was applied at later growth stages. Much of the S applied during these stages, however, accumulated in excessive amounts within the leaves and was not retranslocated despite severe S shortages during seed formation. Seed yields were not affected by time of S application except under conditions of severe S stress where S applied after the rosette stage did not allow recovery of maximum seed yields. Plant maturity was delayed when S was applied after the rosette stage. The results suggest that S deficiency diagnosis using plant tissue analysis will allow successful amendment of S deficiency in rapeseed providing sulfate is applied during or shortly after the rosette stage.

¹ Contribution of the Saskatechewan Inst. of Pedology no. R333, Dep. of Soil Sci., Univ. of Saskatchewan, Saskatoon, Sask., S7N 0W0 Canada.

² Graduate Student and Professor, respectively.

Received for publication March 28, 1983. Accepted for publication August 4, 1983.