SOIL SCIENCE DISCUSSION.
Professor N. M. Coomher, of the Agricultural, Department, Leeds, England, opened a discussion on " Recent Developments in Soil Science" at a conference of horticultural organisers held at the Midland Agricultural and Dairy College. The mental picture of the soil had changed, he said, during the last ten years. The old idea was that each soil particle was surrounded by water, but recent research had shown that there was a colloid substance round each particle, and in clays this colloid layer on the particles was much thicker that on the particles in silt, or sand This to some extent explained the difference in behaviour of the different types of soil, While all sour soils were acid, all acid soils were not sour. Owing to the difference in the thirkness of the colloid layer on the particles, a small deficiency of lime in a sandy soil, as indicated by the lime requirement test, was much more serious than a similar deficiency in a clay soil
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New Zealand Herald, Volume LXII, Issue 18996, 18 April 1925, Page 17
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166SOIL SCIENCE DISCUSSION. New Zealand Herald, Volume LXII, Issue 18996, 18 April 1925, Page 17
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