50 INDIAN CORN CULTURR. 
At the Purdue University experiment station 
Prof. Latta has found the average results of 
cultivating corn for six years, at depths of one, 
two, and three inches, to have been decidedly 
in favor of shallow culture, the average yields 
being 51.06 bu. for one inch, 50.09 for two, and 
48.73 bu. for three inches.* By referring back 
to the report on frequency of cultivation at the 
Ilhnois station 1t will be noted that the shallow 
gave an increase of four bushels per acre over 
that of the deep in both ordinary and frequent 
FIG. 23. 
cultivation. Figs. 22, 25 and 24 show three in- 
teresting forms of culivators specially made for 
shallow culture. 
The root-pruning of corn directly bears 
upon the subject of depth of cultivation. Some 
years ago attention was directed to this subject. 
In 1882, at the New York experiment station, 
root-pruning of corn was compared with that 
not root-pruned, by Dr. E. L. Sturtevant, with 
* Bulletin 50, Vol. V, April, 1894, Purdue University agri- 
cultural experiment station, p. 48. 
