. Cyclopedia of farm crops. Farm produce; Agriculture. The double-shovel plow in 1820, used until very recently. Fig. 112. A threshing device as pictured in 1845 (Warren's horse-power and thresher). "The machines may be placed as follows, viz.: The horse-power. Fig. 1, and the pulley-box. Fig. 3. outside the barn, and the threshing machine. Fig. 2, inside any convenient distance, say c'lbout 4 ; general increase in yield was 400 to 500 per cent. This shows that a plain rotation is itself capable of increasing yield, but that a greater increase is to be expected by a combination
. Cyclopedia of farm crops. Farm produce; Agriculture. The double-shovel plow in 1820, used until very recently. Fig. 112. A threshing device as pictured in 1845 (Warren's horse-power and thresher). "The machines may be placed as follows, viz.: The horse-power. Fig. 1, and the pulley-box. Fig. 3. outside the barn, and the threshing machine. Fig. 2, inside any convenient distance, say c'lbout 4 ; general increase in yield was 400 to 500 per cent. This shows that a plain rotation is itself capable of increasing yield, but that a greater increase is to be expected by a combination of rotation and manuring. The first rotation-farming to gain wide attention in North America seems to have been the so-called Norfolk system. This was chiefly a four-crop rotation employed on the light lands of Norfolk, England, and which had grown up during a long course of years. A century and more ago this system was explained by writers and thereby became widely known, the more so because at that time the American agricultural literature was drawn chiefly from English sources. An account of " the Improvements made ill the County of Norfolk" comprised the larger part of Jared Eliot's "Fourth Essay upon Field Husbandry," published at Killingworth, Connecticut, in 1753. The exact rotation itself—comprising roots, barley, clover, wheat, in various combinaticns—was of less impor- tance to the American colonies than the fact that attention was called to the value of rotation-farming in general. At the same epoch another system of farming practice was also coming in from English sources. This was the clean- tillage system introduced by the epoch-making experiments of Jethro Tull. Between the discussions of the Tull "new husbandry" and the Norfolk rotations, agricultural practices were challenged and overhauled in the new country. One of the early explanations of the good results of rotation of crops was the doctrine that some plants exhaust the so
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