. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. Fig. 449. Cottonwood (Populus deltoides).. \ Fig. 450. Box elder (Acer AV gundo). truck-farming. At a smaller expenditure of labor, forest land is capable of producing at the same time an equal, if not a greater amount of useful vegetable substance than farm land. Thus, common farm crops yield on an average 3,400 to 4,600 pounds of vegetable substance per acre ; of this, only a
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. Fig. 449. Cottonwood (Populus deltoides).. \ Fig. 450. Box elder (Acer AV gundo). truck-farming. At a smaller expenditure of labor, forest land is capable of producing at the same time an equal, if not a greater amount of useful vegetable substance than farm land. Thus, common farm crops yield on an average 3,400 to 4,600 pounds of vegetable substance per acre ; of this, only about one-third (1,000 to 1,500 pounds) is in ^ the form of grain. An acre of forest produces under human care 8,000 to 10,000 pounds of vegetable substance annually, and of this about one-half is in the form of wood, the re- mainder being roots (450 pounds), and leaves (3,000 pounds). Deducting from the wood the amount of water held by it mechanically, there re- mains 1,500 to 3,600 pounds (dry weight) of vegetable sub- stance, as the product of one acre in one year. Putting these facts together with the Census fig- ures, according to which there is one man for every forty acres of improved farm land, the inference may be drawn that in agriculture the labor of one man is instrumen- tal in raising annually 40,000 to 60,000 pounds of useful vegetable substance ; the same amount of labor expended in Hard o^fugS maple growing wood crops could pro- (Acer sacckannum). .^/^ 0 Fig. 451. Silver or soft maple (Acer dasycarpuvi).. 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 Bailey, L. H. (Liberty Hyde), 1858-1954. New York : Macmillan
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