ROTATION OF CROPS 235 



economic farming, and should not be lost sight of in 

 planning rotations. 



322, Economic Use of Manures. Farm manure 

 should be applied to those crops which experience has 

 shown to be the most benefited by its use. At least 

 once during a five years' rotation the land should receive 

 a dressing of stable or some other manure. If com- 

 mercial fertilizers are used, they should be applied to 

 the crops which require the most help in obtaining 

 food. With the growing of clover and the use of 

 farm manures, only the poorer kinds of soil will re- 

 quire commercial fertilizers for general crop produc- 

 tion. It is more economical to reenforce the farm 

 manures with fertilizers especially adapted to the soil 

 and crop, than to purchase complete fertilizers for all 

 crops. 



323. Salable Crops. In all farming, something 

 must be sold from the farm. It should be the aim to 

 sell products which remove the least fertility, or if 

 those are sold which remove large amounts, to return 

 in cheaper forms the fertility sold. In a good rotation 

 it is the plan to have at least one salable crop each 

 year. The whole farm need not undergo the same 

 rotation at the same time and the rotation may be 

 subject to minor changes as circumstances require. 

 To illustrate, wheat and flax occupy about the same 

 position in a rotation. If at seeding time the indica- 

 tions are that wheat will be a poor paying crop and 

 flax command a high price, flax should be sown. 

 The rotation should be such that one of two or three 

 crops may be grown as circumstances require. 



