. Cyclopedia of farm crops. Farm produce; Agriculture. 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
. Cyclopedia of farm crops. Farm produce; Agriculture. 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 live- turist or other special farmer, for the chases in order to maintain the produ-. Fig. 121. stubble digger, to fit land for a succeeding crop, 1906. interject another Insects and follow all crops. Nearly all continu crop for a year or two in order to clean the land. plant diseases follow certain crops. There are no insects or diseases that Therefore a rotation cleans the fields of many of these troubles and pests, ous-cropping schemes run into these difticulties sooner or later. A short and sharp rotation, for example, is the best means of contending with wire- worms. It is not uncommon sometimes to find onions failing year after year in the best onion regions. The trouble is likely to be due to pests or diseases. Two or three years of celery or other crop may clean up the difficulty. The horticulturist is particularly liable to suffer from insects and plant diseases, especially if he is an orchardist, because he cannot well practice a definite rota- tion. The larger part of the spraying devices and materials are devised to meet the necessities of the h
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