Campbell's 1902 Soil Culture Manual. 



25 



No. 6, we show a hill of potatoes which has been grown by shallow culti- 

 vation. It is proper to add that this -ground was first plowed eight 

 inches deep, having been previously disced, the plow followed with a sub- 

 surface packer, and the whole portion made thoroughly fine and firm. In 

 securing this illustration, the lateral roots of many different hills were 

 washed out. The main roots running from the stock were almost inva- 



Cut No. 6. 



riably found to have traversed in quite a uniform distance from the sur- 

 face of moisture; the little branches running out from the main roots 

 taking various directions, some lateral and some down. This illustration 

 quite perfectly shows all these important facts. Notice the two and a-half 

 inch mulch, and the very fine, uniform condition of the balance of the 

 furrow or plowed portion, where may be seen numerous roots. This rep- 

 resents a hill of potatoes taken from a field grown on our farm in Brown 

 County, South Dakota, in 1894, when thirty-two acres of high, level prairie 



