18 BULLETIN 1458, U. S. DEPARTMENT OF AGRICULTURE 
CORN 
AVERAGE YIELD PER ACRE IN BUSHELS 
5-YEAR PERIODS, 1885-89 —1920 “24 
BUSHELS 
KANSAS 
ONS. Os Fi aN Oy Oh SS GUE ER Gs AG erg = Ob oF 1) FS ON ane 
POD BD SRK US. (SUS Lap oVol= i) ol eiaiia Gol OM eats 
Mie Secs cabs alle aD ace Naame T era Metet jak at Pied ele heed ye) eek! Ges ace ee a 
2 =O. )2.© 1b. CO. 10 10 w -O cin tOr-O; 04 Yr Oo 1n = O') Int 5O) (INT ko rn9 19 
ana oO d0O0->- -— A @ 8) erro Yor —— 1 ser, Ur ONe On oe 
aoa ooaoeoensa om onan ow 9D DHA VWF OD 
Fie. 7.—Outstanding changes have occurred in the level of corn yields during the last 
four decades in the northeastern portion of the United States. In the northern portion 
of the South Atlantic States (Maryland, Virginia, and North Carolina) the rise in 
the level of corn yields per acre has been relatively even more marked than in the 
northeastern United States. In the East South Central States yields have remained 
either stationary or have risen slightly in some States 
