Diagnosing manganese deficiency in canola
Canola is less susceptible to manganese deficiency than cereals but it has been seen more in recently heavily limed soils.
What to look for
- Pale plants with interveinal paleness that is seen on newly limed areas.
- The whole plant becomes paler.
- Younger leaves develop interveinal paleness to yellowing, but veins remain green
Where does it occur?
- As canola has an extensive network of fine feeder roots that can secrete organic acids that enhance nutrient uptake, deficiency is not common.
- Heavy lime applications can induce deficiency in the year of application.
How can it be monitored?
- There is no reliable soil test for manganese. Soil test manganese is generally poorly related to grain yield increase so that critical concentrations can't be determined.
Page last updated: Wednesday, 6 May 2015 - 11:34am