The Story of the Soil; from the Basis of Absolute Science and Real Life, by Cyril G. (Cyril George) Hopkins
page 134 of 371 (36%)
page 134 of 371 (36%)
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THE following day Percy collected soil samples to represent the
common type of soil on the farm. In the main the land was nearly level and very uniform, although here and there were small areas which varied from the main type, and in places the variation was marked. Percy and his host devoted the entire day to an examination of the soils of the farm and the collection of the samples. "The prevailing soil type is what would be called a loam," said Percy, "and a single set of composite samples will fairly represent at least three-fourths of the land on this farm. "It seems to me that it is enough for the present to sample this prevailing type, and later, if you desire, you could collect samples of the minor types, of which there are at least three that are quite distinct." "A loam soil is one that includes a fair proportion of the several groups of soil materials, including silt, clay, and sand." "What is silt?" asked Mr. Thornton. "Silt consists of the soil particles which are finer than sand,--too small in fact to be felt as soil grains by rubbing between the fingers, and yet it is distinctly granular, while clay is a mere plastic or sticky mass like dough. What are commonly called clay soils consist largely of silt, but contain enough true clay to bind the silt into a stiff mass. In the main such soils are silt loams, but when deficient in organic matter they are yellow in color as a rule, and all such material is usually called clay by the farmers." |
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