. Cyclopedia of farm crops. Farm produce; Agriculture. 86 OUTLINE OF CROP MANAGEMENT are grown for the special purpose of being turned under, root and top, and are not usually a definite part of the rotation; but, so far as it goes, the root-and-stubble part of similar crops employed in the rotation answers the same purpose. (6) Well-considered rotation schemes reduce the necessity of excessive use of concentrated or chemi- cal fertilizers. On the other hand, they may utilize such fertilizers to greater advantage than do the con- tinuous-cropping schemes, as has been shown by the Ohio Experime
. Cyclopedia of farm crops. Farm produce; Agriculture. 86 OUTLINE OF CROP MANAGEMENT are grown for the special purpose of being turned under, root and top, and are not usually a definite part of the rotation; but, so far as it goes, the root-and-stubble part of similar crops employed in the rotation answers the same purpose. (6) Well-considered rotation schemes reduce the necessity of excessive use of concentrated or chemi- cal fertilizers. On the other hand, they may utilize such fertilizers to greater advantage than do the con- tinuous-cropping schemes, as has been shown by the Ohio Experiment Station. (7) A good rotation provides for the making of farm manures, because it grows crops for the feed- ing of live-stock. As a general practice, it is better to market the hay and straw crops in the form of ani- Fig. 120. Four-row beet cultivator of today. ^^]^ ^j. j^^j^^j products than to put them on the mar- ket directly ; for the farmer not only has the opportunity to make an extra profit by an extra process, but he gains the manure with which to maintain the fertility of his lands. He raises the crop to feed. his stock to secure manure to raise a better crop. In stock farmer has the great advantage of the horticul- latter must resort to special practices or special pur cing power of his land. (8) Rotation is a cleaning process. Cer- tain weeds follow certain crops. Chess and cockle are common weeds in old wheat-lands. The life-cycle of these plants is so similar to that of wheat that they thrive with the wheat; and the seeds may not be removed from wheat-seed in the ordinary cleaning process. These weeds are soon eliminated by the grass-course in the rotation, or by some clean-tillage course. Most weeds are eradicated in the course of a good rotation ; in fact, a rotation cannot be considered to be good unless it holds the weeds in check. With crops which are not grown as a part of a rotation, as rice, it is sometimes necessary to the maintaining of fertility, the li
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