BY ROBERT CLIEN
THE LINK
I had a brief correspondence with Dr N. Sai Bhaskar Reddy from India on his trials on alkaline soils which I am copying here.
I think that sizing is not a particularly critical factor, except for convenience. This is a bit of a surprise as I would have expected that fine grained powder would maximize the overall homogeneity of the soil. What appears to be happening is that the root system responds to the presence of the charcoal even at some tangible remove. This clearly suggests that while fines are likely preferred in special cases, they are not at all necessary.
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