122 



ELEMENTAKY AGRICULTURE 



Keeping the Weeds Down. A few days after 

 planting, the field should be harrowed to kill the 

 grass and weeds that are ready to sprout, because 

 they grow faster than the corn. When the corn is 

 a few inches high the harrow must be used again to 

 break the crust and to supply air to the soil as well 

 as to keep the weeds and grass down. 



Plowing the Corn. The field should be cultivated 

 two or three times more, but after the corn roots 

 have spread out between the rows, it is not safe to 

 plow too clo^e to the row or too deep> for fear of 

 breaking off millions of little rootlets that are feed- 

 ing the plant. This applies also to the raising of sweet 

 corn or pop corn and other crop?? needing tillage. 



Fig. 66. Sprinp-tooth harrow. 



