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THE OLIVER PLOW BOOK 



Figure 3 



The clods are larger than those shown in either of the two previous 

 illustrations. The air spaces at the bottom of the furrow slice are more 

 pronounced, and the furrow slice shows cloddy formations rather than 

 pulverization. 



The work in Figure 3 shows that the earth was 

 turned up into clods. There is little pulverization. 

 The bottom used in doing this work pulled 13% lighter 

 than the one that did the work shown in Figure 1 . 



Figure 4 



Clods are larger than in Figure 3. The furrow slices are unevenly 

 formed. They are merely larger clods intermingling with smaller ones 

 and the finer soil particles. There is no indication of pulverization 

 which is necessary for the proper aeration of the soil. 



The plowing done in Figure 4 shows the ground broken 

 into large clods, little or no pulverization and very im- 

 perfect furrow slices. This job required less power by 

 1 4% than the one shown in Figure 1 . 



