Sulfur Nutrition of Rapeseed II. Effect of Time of Sulfur Application1
- H. H. Janzen and
- J. R. Bettany2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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