PASTURES, MEADOWS, AND FORAGE 



195 



are generally worthless as forage plants, although some species 

 in the West and South afford acceptable cattle ranges when 

 grass is not to be had. Figs. 74 and 75 show 

 common types of sedges, such as are frequent in 

 swales. 



305a. In specialty-farming (4a), abundance of 

 plant -food and humus material can be added to 

 the soil, and rotations may not be needed ; but 

 in general or mixed husbandry some kind of rota- 

 tion is essential. Read Chapter xv., "Fertility of 

 the Land." 



3056. The kind of rotation must be determined 

 by the soil and many other factors. A four-year 

 rotation, in which an exacting crop follows a less 



Fig. 76. 



' Timothy (Phlntm 

 pratente) x%. 



Fig. 



. June-grass or blue-grass 

 (Poa praUntit) x%. 



