[Digestion] Interaction between bio-slurry and superphosphate

[Nicolas Borchers]

Dear all,

I have a question regarding the interaction between bio-slurry and 
mineral fertilisers.

During our field trial this year, we happened to mix together bio-slurry 
with superphosphate while planting potatoes. The mixture started fizzing 
and foaming intensely. The reaction lasted for a few minutes. The 
bio-slurry came from the water chamber of a fixed-dome 10m3 household 
digester fed with pig slurry, and had a pH of 7.1. The fertiliser was 
normal superphosphate (hence a mixture of monocalcium phosphate and 
calcium sulphate). Urea was also present in the same planting hole, but 
seemed to play no direct role in the fizzing.

Could anyone shed light on the mechanism of the reaction?

Thank you for any advise,

Nico

-- 

*Nicolas Borchers *???

Organic Farming Officer ????????


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Skype: nborchers


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