140 FORAGE CROPS. 



sissippi, and while it is likely to prove worthy of an 

 important place in the agriculture of these states, it 

 is not likely that it will ever wholly supplant the 

 cowpea. But it may prove a great aid to the latter 

 in furnishing food and in renovating the soil. North 

 of the Ohio and east of the Mississippi the soy bean 

 can be grown with more or less success, even up to 

 the Canadian border. But within much of this area 

 it cannot be depended on to mature its seeds. For 

 this reason, and for the further reason that clover 

 grows well within the same area, it is likely that the 

 soy bean will not be looked upon as an indispensable 

 crop within the limits of the area that is being con- 

 sidered. When clover fails, however, it may some- 

 times prove advantageous to sow soy beans to sup- 

 ply the lack. 



In the states north of the Missouri and west of 

 the Mississippi, there is probably no place for the 

 soy bean in the economy of the farm, unless in the 

 triangle between those rivers at the juncture, which 

 includes a part of Minnesota, Iowa and South 

 Dakota. In the Rocky mountain valleys south 

 from Montana and Washington it may grow 

 well under irrigation, but the excellent crops of 

 alfalfa which grow in these valleys are likely to ren- 

 der its growth less necessary. In Canada the soy 

 bean is not likely ever to gain a permanent foothold, 

 unless its properties should become considerably 

 modified. 



Place in the Rotation. — The place in the rota- 

 tion for the soy bean is not far different from that 

 of the cowpea (see Page 131)- It is generally 

 grown as a cleaning crop, and when so grown it 

 ought to be placed between two grain crops, if it is 



