66 THE OLIVER PLOW BOOK 



plow his ground and cultivate to keep the surplus away 

 from the surface, but in such shape that the plants can 

 draw upon it. 



The illustrations on the opposite page are photo- 

 graphs of an experiment to bring about the value of 

 plowing in July for fall wheat. This land was a light, 

 sandy and gravelly river bottom loam poorly adapted to 

 small grains. The farm was situated in the northern 

 part of Indiana. The field treated in this manner showed 

 an increase of twenty per cent, over the rest of the field 

 which was plowed early in September in the ordinary 

 manner. The seeding and fertilizing over the entire field 

 were exactly alike. 



No. 1 The field plowed on July 18. Observe the foul condition of 

 the unplowed ground. It is full of milk weeds and dock- 

 No. 2 Later in the day the disk harrow and pulverizer were called 

 into play to put the seed bed in shape. 



No. 3 Observe that the weeds are buried deep in the furrow and the 

 disked and rolled section is compacted away from the unplowed section 

 showing that the seed bed is compact from top to bottom. 



No. 4 Photograph taken June 25, the following year. The portion 

 of the field plowed, disked and rolled. Observe the lack of milk weeds 

 and dock- 

 No. 5 A few of the wheat heads selected at random from the field 

 shown in No. 4. These heads produced twenty per cent, more per acre. 



No. 6 The section of the field that was plowed and harrowed in the 

 ordinary manner. Observe the appearance of milk weeds. This section 

 was photographed the same day as the field shown in No. 4. 



No. 7 A few of the heads selected at random from the portion of the 

 field shown in No. 6. Observe how much bigger and better the heads 

 are in No. 5. 



