. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. CHAPTER I THE SOIL AND ITS ORIGIN What Soil Is.—In its broad meaning, soil is that friable, upper stratum of the earth composed for the most part of mineral matter resulting from the breaking up and decay of rocks. It extends to sohd rock—varying in depth from an inch or so to many hundreds. FiQ. 1.—A spiral nekiula. It is believed that the earth was at one time a revolving mass of gaseous material. of feet. Mixed with this mineral matter/ especially at the surface, is more or less organic
. Productive soils; the fundamentals of successful soil management and profitable crop production. Soils. CHAPTER I THE SOIL AND ITS ORIGIN What Soil Is.—In its broad meaning, soil is that friable, upper stratum of the earth composed for the most part of mineral matter resulting from the breaking up and decay of rocks. It extends to sohd rock—varying in depth from an inch or so to many hundreds. FiQ. 1.—A spiral nekiula. It is believed that the earth was at one time a revolving mass of gaseous material. of feet. Mixed with this mineral matter/ especially at the surface, is more or less organic matter incorporated through the subsequent growth of vegetation. Soil Is Forming All the Time.—The fact that soil is derived from rocks implies that it is one of the later products of creation. All soil, however, was not formed in some particular period in the early history of the earth—some of it was formed millions of years ago and some is being formed today. 1 Generally speaking, mineral matter is any substance not formed by plants or animals. Organic matter is any substance formed by plants or animals. 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Weir, Wilbert Walter, 1882-. Philadelphia London, J. B. Lippincott company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectsoils, bookyear1920
