236 
Row No. 2. The majority of the roots were within 12 inches of 
the surface. A few were traced to the depth of 27 inches. Later- 
als extended about 12 inches on each side of the plant. 
Oct. 17. Row No. 1. Corn fully matured. The roots filled the 
soil to the depth of 24 inches also on each side of the plant the same 
distance. Several roots were traced to the depth of 34 inches. Lat- 
erals extended horizontally three feet from the plant. There were 
numerous fibrous roots the entire length of the laterals that grew 
upwards to the surface. 
Row No. 2. The majority of the roots reached the depth of 17 
inches. A few were traced to the depth of 30 inches. Numerous 
laterals extended 45 inches from the plants on each side. 
Oct. 19. Lona Rep Mancet WurtzeLt. The majority of the 
fibrous roots reached the depth of 16 inches. Many of them ex- 
tending horizontally 39 inches from the plant, nearly filling the 
soil with fine fibrous roots to the depth of 8 inches from the sur- 
face. The tap roots were traced to the depth of 26 inches. Nu- 
merous roots about the size of a wheat straw extended horizontally 
from the tap root about 8 inches below the surface. 
Lone Rep MaNnGet WurRtrzEL, root pruned. The tap roots ex- 
tended to the depth of 26 inches. Laterals extended horizontally 
about 4: inches. There appeared to be but little difference in the 
root growth of this and the plant not root pruned, owing perhaps 
to the fact that the roots had not extended latterally sufficiently to 
have been cut off by the spade. 
CARROTS AND Parsnip. Carrots and parsnip seeds were planted 
in four inch drain tiles so as to prevent the formation of all except 
vertical roots. 
Carrot grown in a four inch drain tile 14 inches long, the tap 
root after reaching below the tile sent out several roots from which 
the fibrous ones grew upward to the surface. The tap root extend- 
ing deeper into the soil. 
Parsnip grown in two lengths of four inch drain tile. The tap 
root extend the entire length of the tiles, sending several roots be- 
tween the tiles where they joined together. Fine fibrous roots ex- 
tended from these both upward toward the surface and also down- 
ward into the subsoil. Roots also grew from below the second 
length of tile upward toward the surface. The parsnip measured 
30 inches in length and about 14 inches in diameter, being of an 
uniform size its entire length. 
Topacco. To observe the effect of manure upon the root growth 
of tobacco, two plants were prepared in the following manner : 
Plat G. 16, was covered with stable manure. ‘he manure was 
spaded in to the depth of 8 inches. After setting the plants, the 
surface was mulched with hay. 
Plat G. 17, had the surface mulched with stable manure after 
setting the plants. 
Sept. 19. Plat G. 16. Roots extended nearly perpendicularly 
downward to the depth of 24 inches. Roots extended horizon- 
tally about the same distance. The majority of the fibrous roots 
were within ten inches of the surface, very few extending below 12 
inches. Roots of the size of a lead pencil were numerous. 
