42 THE PLOW AND PLOWING 



and the kind of crops to be grown. Clay land, plowed 

 in the fall, is better for wheat to be planted in the 

 spring, and, on the other hand, spring-plowed land 

 seems to produce better crops of corn or potatoes. 

 Some soils may be spoiled if plowed when too wet, and in 

 some instances a poor crop may be produced if too 

 much of the subsoil is turned out on top of the land. 



Kind of plows. Many men are working to improve 

 the plow. There are two general kinds of plows, 

 called moldboard plows and disk plows. Different 

 kinds of plows are used for different kinds of land. 

 They vary from heavy, wood plows to the light sod 

 breaker with rods instead of moldboard, and from the 

 simple disk plow to the heavy, deep tilling machine. 

 Inventors are giving attention to rotary plows. 



QUESTIONS 



1. What results are obtained by plowing? 



2. In your locality to what depth is the land plowed for each 

 of the leading crops? 



3. What is the effect of plowing when the soil is too wet ? 



4. Under what conditions is it well to plow the ground in the 

 fall for crops that are planted in the spring ? 



