Archive image from page 366 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 \ 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
Archive image from page 366 of Cyclopedia of farm crops . Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada cyclopediaoffarm00bailuoft Year: 1922, c1907 \ 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 ofugS maple growing wood crops could pro- (Acer sacckannum). ./ 0 Fig. 451. Silver or soft maple (Acer dasycarpuvi).
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