84 INDIAN CORN OULTURE, 
foot or mouse’s ear.” There is considerable 
significance in this in fact, as the oak is tardy 
in showing its leaves until : 
the ground has had its spring 
warming. Corn not only re- 
quires a Warm air tempera- 
ture to grow well in, but 
the soil must be reasonably 
warm. <A temperature of 
the soil to a depth of one 
inch of from 50 to 60 deg. 
Fahr. will justify planting. 
In the great corn belt plant- 
ing begins about May 1 and 
often extends over the en- 
tire month. If the ground 
is ready it is not wise to 
hurry the seed into the 
ground too soon, as the vi- 
tality of the seed or young 
plant may be seriously 1m- 
paired by being exposed to 
cold rains which often fol- 
low stretches of warm April 
weather. The fo llowing a 
table shows the results of 
early and late planting con- | 
ducted by Prof. Latta at the Purdue Univer 
experiment station* The experiment began 
Fia. 25.—HARRISON HAND CORN PLANTER. 
* Bulletin No. 50, p. 45, Purdue University agricultural 
experiment station. © 
