Wheat .45
field, which is not so fertile, as a rule. Contrary to the general
belief, a crop of tobacco does not take as much plant food
from the soil as a crop of corn which the same soil is capable
of producing. Soil which will produce 1,500 pounds of ·
tobacco per acre should produce 75 bushels of corn per acre. _
The tobacco contains approximately 48 pounds nitrogen,12
pounds phosphoric acid and 66 pounds potash, while the corn,
includlng the stover, contains approximately 111 pounds
nitrogen, 40 pounds phosphoric acid and 64 pounds potash.
It is therefore evident that tobacco land is in much better
physical condition and contains more moisture and available
plant food than the corn land. It is moisture and available
plant food that the wheat crop needs to start it off in the -
fall. Moreover, it is impossible to put the soil of the corn
field in good condition for wheat on account of the interfer-
ence of the stalks, and besides there is a great waste of
· space in the ground occupied by the corn shocks in case the
. corn is cut. Again, there is more or less injury to the wheat
by the gathering of the corn and stover. The tobacco land ,
is easily put in ideal condition for wheat.
To obtain the best results, it is our belief that wheat
should not follow corn in any rotation, for the reasons >
enumerated above. The Experiment Station has adopted a
rotation of corn followed by rye for a winter cover crop,
which is turned under in the spring when the ground is `
prepared for soy beans ( or cowpeas) for the second year
crop. Soy beans are followed by wheat for the third year, ·
and wheat by clover for the fourth year. This rotation gives
a clover sod for corn, and allows a green crop of rye to be
turned under. The rye prevents the loss of available plant
food left in the corn field and prevents washing during the
winter. The soy beans leave the ground in as fine condition
for wheat as tobacco, and being a legume, do not draw so
heavily upon the soil nitrogen as tobacco. Thus in this
rotation there is the advantage of one rye cover crop and two
legume crops in four years. In a corn, wheat and clover
rotation there is no cover crop to be turned under, and only
one legume crop. The experience on the Experiment Station