Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 10. — Upper figure represents nitrous ferment prepared by Winogvodsky from soil from CiteLower figure represents nitric ferment from the same source. (Wiley Soils.) 92 FOREST PHYSIOGRAPHY The bacteria live as parasites within the roots of the host plant fromwhich they derive their carbohydrate food supply. The presence ofthe parasites stimulates the development, by the root, of the peculiarswellings known as root nodules or root tubercles. These becomefilled with a bacterial mass consi
Forest physiography; physiography of the United States and principles of soils in relation to forestry . Fig. 10. — Upper figure represents nitrous ferment prepared by Winogvodsky from soil from CiteLower figure represents nitric ferment from the same source. (Wiley Soils.) 92 FOREST PHYSIOGRAPHY The bacteria live as parasites within the roots of the host plant fromwhich they derive their carbohydrate food supply. The presence ofthe parasites stimulates the development, by the root, of the peculiarswellings known as root nodules or root tubercles. These becomefilled with a bacterial mass consisting principally of swollen and ab-normal (hypertrophied) Bacteroids having forked outlines, but inpart also of bacteria which remained in their normal condition.^ Fora time the nodule increases in size and the bacteria continue to furnisha steady supply of nitrogenous material to the host plant. Ultimatelythe nodules cease growing, the Bacteroids degenerate, and their sub-stance is absorbed by the host. Normal bacteria, however, remainand provide for future reproductions. When the root nodules c
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
