20 



TILE DBAINAGE. 



ral and horticultural crops will not feed below the top level 

 of frequent saturation. Fart of my apple orchard is tiled, 

 part not. On the untiled part the roots run close to the sur- 

 face, get less nourishment, are more disturbed by tillage 

 operations, and over four times as many have died out or 

 been killed by tillage as in the tiled part immediately adja- 



Fig. 6. Corn roots, sh allow on Fig. 7. Corn roots running- deep 

 clayey soil not tiled, in a wet in a tile-drained soil, he the sea- 

 season, son wet or dry. 



