Brian Johns

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since Feb 17, 2015
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Recent posts by Brian Johns

Hi Gilbert,

I ran your numbers from the other thread through my interpretation of the excess cation worksheet
now take my calculations with a grain of salt as i'm doing this more as an exercise for me to help understand the connections.

you say your ideal soil would be 76,10,5 (Ca,Mg,K) = 91% of cec...I've been working on 80-85% total cations & 76,8,4
there was no sodium level in your post so i used Na = 0.

i calculate you at roughly 80, 5, 12 = 97% of tcec
but what i get from it is your soil is in Potassium excess by 1011-323 = 688ppm (323 ppm ideal via my take on the excess cation worksheet)

i'd be buffering the cations with anions (Sulphur & Phosphorus) and nitrogen

you say you've added some manure and woodchips... they'll be a store for Sulphur, Phosphorus and Nitrogen until it breaks down.
so the benefit of those additions might not show for a season or so until they've fully composted and start to give back the initial drawdown.

manganese, calcium, and boron will be tied up by the excess potassium, so look for those deficiencies as potential clues.

red clover grows well in excess potassium apparently, maybe you could intentionally mine the excess potassium via red clover and feed it to the chooks and make use of the eggs offsite.
the roots of the clover will give some nitrogen back.

g/l

Brian


9 years ago
Hi Gilbert,

I've been reading the "intelligent gardener" by steve solomon and have been inspired by the notion of soil balancing.

39.5 cec sounds dreamy...

just wondering why you don't try and buffer the cations with some sulphur?
from what i gather the excess cations will tie up as sulphates.
same may be achieved with nitrogen to nitrates, i gather.

my ground is the other end of the scale - low in available magnesium and very loose.

how's the soil life and fungals they might help you buffer the cations too.

g/l
9 years ago