Publisher's Synopsis
Excerpt from Parallelism of the Soils Developed on the Gray Drifts of Minnesota: A Thesis Submitted to the Faculty of the Graduate School of the University of Minnesota, in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy
As the common farm crops in southern Minnesota derive not only their mineral constituents but also their supply of water chiefly from the first three feet and almost exclusively from within the first five feet, we scarcely need to consider the portion below the fifth foot. As most of the crops draw more or less upon the third foot for these and hence the whole of the first three foot section is to be considered as well within the root zone so that a study of the soil should include sections to at least this depth.
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