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Soil mix question..........

Posted by dancinglemons 7B (My Page) on
Wed, Jun 29, 11 at 3:29

Hello all,

I know this is the container forum but hopefully someone can be of assistance. I do use mostly containers but have a few raised beds. A new bed will be filled with a mix of 30% coir, 30% spaghum peat, 30% pine bark fines and 10% bagged "mushroom compost". My plan is to add dolomite and composted chicken manure before planting corn. The bed is 6f x 4f x 12inches tall.

Will this work?? Suggestions?? All of my other raised beds have the 'used' Earthbox/tainer mix from years past. Not enough SWC's needed emptying this year to fill this new bed.

Any and all suggestions are appreciated.


Follow-Up Postings:

RE: Soil mix question..........

Good question, and I'll be stnding with you in the peanut gallery, because I'm looking to fill some new raised beds as well, and can't seem to find a solid answer on what soil to mix/use.


RE: Soil mix question..........

i would increase the bark fines to 60% because the choir and peat will hold alot of water. every thing else sounds good. also if wanted to throw in another 10% of another kind of compost like steer.imo

RE: Soil mix question..........

  • Posted by tapla z5b-6a mid-MI (My Page) on
    Thu, Jun 30, 11 at 21:23

The coir will be very high in K, and may be salty, as will the shroom compost (salty). I generally suggest that people limit the organic fraction of their RB soils to less than 20%, and that they use OM that they know will break down slowly - e.g., finished compost or pine bark. Shrinkage is going to be significant as your100% organic mix gasses out. I would also expect it to be difficult to keep a grip on the N requirements because of considerable N immobilization. Soil temps (high) may even come into play because with 100% OM, you're going to have a lot of heat generated by the composting process.


RE: Soil mix question..........

terrybull and tapla ::

Thanks to both of you! I did not know coir was high in K -- the brand I use "Botanicare Cocogrow' claims to be low sodium but I have not been able to determine what the sodium level is. I will leave out the mushroom compost at this time. I will have access to bulk pine bark fines (composted and fresh) this weekend. Which would be better? Would adding perlite to the mix be OK?? In this particular RB I am only growing corn.

Thanks again,

RE: Soil mix question..........

composted. you can add some perlite but its not needed in your rb.

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