NORTHRUP, KING & CO’S KINGSCROST HYBRID SEED CORN 
Maturity of Hybrids 
Corn Maturity Belts 
in Wisconsin 
No matter how good a hybrid is 
it must be of proper earliness to be 
best for any particular farm. The best 
basis for selecting a hybrid of proper 
earliness is to compare its earliness 
with regular varieties which have 
been grown in the area in question 
over a long period of time. 
From 1930 to 1936, every season 
has been much warmer than average. 
In such seasons it is possible to ma¬ 
ture a later corn than in seasons 
with average heat. 
Since most farmers have first grown hybrids 
during these years, many have selected hybrids 
considerably later maturing than their native 
varieties but have been able to mature them. 
Later maturing hybrids, of course, have a yield 
advantage over earlier ones. 
In order to give a proper perspective, the 
chart on page 11 is presented. It shows amount 
of heat during the 5 corn growing months each year from 1820 to 1936— 
116 years. The average heat units for 116 years is 76. The average for the 
7 years, 1930 to 1936, is 94 or 24% over normal. The years 1925-1926, 
1928-1929, are near average seasons. 
To show how these hot and cold seasons affect time when the corn 
crop ripens, on page 12 is a table showing when Standard Minn. No. 13, 
Strains of hybrids have been de¬ 
veloped to meet the needs of the 
several maturity belts in the state. 
From Wisconsin Circular 282. 
