Bulletin Volume 147-155

Bulletin Volume 147-155

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...the subsurface soil and subsoil may be expected to be basic also, 'for the surface soil is much more apt to lose its content in bases through leaching or otherwise. There are several explanations which might be given for the occurrence, but the most plausible is that in these cases the loess was thin and underlaid by the poor Kansan or Illinoisan drift, remains of old glaciations. These old glaciated soils are well-known for their low content of plant food, because of the extensive leaching to which they have been subjected, and it is reasonable to suppose that their content of lime should also be low. Bearing this in mind, the acidity in the subsurface soils and subsoils in these cases does not appear so remarkable as the nonacidity of the surface soil. Evidently these particular soils at some time accumulated lime, probably through the growth of shell-fish in ponds which may have located here and there, or it may be that because of insufficient drainage there was a very much smaller loss of lime than that ordinarily occurring in this loess soil. But whatever the reason, the condition of the subsurface soils and subsoils are not necessarily the same as that of the surface soil, as far as acidity is concerned, and may be the direct opposite. Tests should be made at each depth, therefore, to ascertain the total deficiency of lime in the soil and the future need of lime. The three soils which were not acid at the surface but were acid at the lower depths should probably be considered with the acid samples from the fact that they showed no large content of calcium according to complete analyses reported elsewhere1 and hence would rather quickly be in need of lime. The total number of acid samples then becomes twenty-three out of twentysix...show more

Product details

  • Paperback | 150 pages
  • 189 x 246 x 8mm | 281g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123674263X
  • 9781236742636