Thursday, March 19, 2009

What is Dolomite

What is Dolomite and clubroot?

Peggy from Organic Growing Pains left me a comment on my last post asking about Dolomite and it's relation to Club root in Brassicas.

So I thought I'd make a post about it and do the best I can to answer.

I might try point form and see how that works.

  • Dolomite is not a fertilizer.
  • Dolomite is a form of lime
  • Dolomite is Calcium magnesium carbonate.
  • It raises pH and supplies calcium and magnesium
  • Dolomite is a soil unlocker and will even help improve clay soils.
  • Use Dolomite only if you have acid and you need to sweeten it.
  • It is slow acting and won't react with any old manures or organic matter.
  • Clubroot affects Brassicas, including radish, seakale, swede and turnip.
  • Clubroot is a fungal disease
  • Clubroot is a soil borne slime mould, Plasmodiophora brassicae
  • Clubroot is usually introduced to the garden in soil that adheres to boots, tools, and wheelbarrows, in garden compost or manure, and directly on infected plants.
  • It is most common in soil that is acid and waterlogged.
Clubroot Symptoms
  • Swollen roots and a distorted root system not to be confused with symptons of root knot nematode attack, which are smaller lumps more evenly distributed along the roots
  • Plants affected grow very slowly and wilt quickly on hot days.
  • They may eventually collapse altogether
Controlling Clubroot
  • Improve drainage and add lime/dolomite at recommended rates.
  • Raise your own plants or use resistant plant varieties.
  • Maintain good weed control as some weeds can carry clubroot
  • Practice good crop rotation.

Hope that helps Peggy.

This is by no means a definitive work, if anyone has anything to add then please leave a comment.


Peggy said...

hi Stewart, thanks for all of the info! I have brassicas to go out soon,before I do I will check the soil PH. Knowing it is a form of lime and calcium mag.carb. at least if I need it I will know what I am looking for.
A post over and above the call of duty!

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