EXPERIMENT ON SOIL IMPROVEMENT. 6 5 
General deductions.—From the results of this experiment it 
will be seen that clover had a high value when used to plow 
under as manure for potatoes. By sowing the clover seed 
amongst the corn in July, this crop was grown mainly between 
the seasons of the regular crop of the rotation. Although the 
clover at the time of plowing under was only three or four 
inches high, it proved to be a very valuable manure. The 
advantages in growing clover in this way for use as green 
manure are mainly four: (1) The expense is very little as the 
catch crop of clover does not interfere with the regular system 
of rotation and no additional plowing or harrowing is neces- 
sary. (2) The clover tends to prevent the loss of nitrogen 
through leaching or washing during that portion of the year 
when the soil is usually bare. (3) The clover growing on the 
soil will prevent washing and cutting of the surface of the soil. 
(4) The clover takes up considerable nitrogen from the air 
which, when the crop is plowed under, becomes available to 
the succeeding crops. 
