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OBJECTIVE: Avoid nitrogen deficiency

  • If leaves are becoming yellow and if more than 30% of plants are not showing nodules, apply nitrogen (this means that inoculation did not work).
  • Depending on the soil nitrogen supply, apply (in one or 2 applications) 80 to 150 units between stage R1 (beginning of flowering) and stage R3 (first pods), if possible prior to irrigation. Use of the perlure (urea) form is recommended.
  • Critical areas: obtain information specific to each region to establish whether it is permitted to apply nitrogen to legumes.

To find out more, download our soybean technical guide: click here.