. Bulletin. 1901-13. Agriculture; Agriculture. REDUCED ABSORPTIVE SURFACE OF BLUEBERRY ROOTS. 41 even when enlarged 5,900 diameters. Notwithstanding the fact, therefore, that the blueberry roots are fine and numerous, their actual absorptive capacity would appear to be small, in consequence of the absence of root hairs. It is found by a computation that a sec- tion of a blueberry rootlet having no root hairs presents about one-tenth the absorp- tive surface of an equal area of a wheat rootlet bearing root hairs, and the thick- ness of the surface membranes in the wheat is certainly not more th
. Bulletin. 1901-13. Agriculture; Agriculture. REDUCED ABSORPTIVE SURFACE OF BLUEBERRY ROOTS. 41 even when enlarged 5,900 diameters. Notwithstanding the fact, therefore, that the blueberry roots are fine and numerous, their actual absorptive capacity would appear to be small, in consequence of the absence of root hairs. It is found by a computation that a sec- tion of a blueberry rootlet having no root hairs presents about one-tenth the absorp- tive surface of an equal area of a wheat rootlet bearing root hairs, and the thick- ness of the surface membranes in the wheat is certainly not more than a quarter that in the blueberry. Furthermore, the blueberry rootlet grows only about inch (1 mm.) a day under favorable conditions, while the wheat rootlet often grows twenty times as fast. In all this provision for rapid food absorption in the one plant and retarded absorption in the other we find a reason for. Fig. 14.—Root of a blueberry plant. (Natural size.). 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 United States. Bureau of Plant Industry, Soils, and Agricultural Engineering. Washington Govt. Print. Off
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