Corn Investigations 
59 
Table 18. — Summary of first and second generation hybrids of 
pure lines of Hogue’s Yellow Dent corn. 1916-1917. 
Yield per acre (bushels) 
Pure lines crossed 
First 
Second 
2 -year 
generation 
generation 
average 
1916 
1917 
1916 
1917 
Fi 
f 2 
(1) 
(2) 
(3) 
(4) 
(5) 
(6) 
(7) 
4 X 12 
38.8 
60.6 
21.6 
32.0 
49.7 
26.8 
4X1 
53.2 
41.6 
31.4 
26.4 
47.4 
28.9 
12 X 5 
44.6 
48.5 
15.9 
22.8 
46.5 
19.3 
8X2 
66.2 
51.9 
38.3 
30.0 
59.0 
34.1 
12 X 2 
58.0 
59.4 
28.0 
32.1 
58.7 
30.0 
10 X 12 
51.5 
53.6 
24.1 
29.9 
52.5 
27.0 
2 X 10 
58.2 
45.2 
24.0 
32.7 
51.7 
28.3 
Average 
52.9 
51.5 
26.2 
29.4 
52.2 
27.8 
Original 
37.5 
46.0 
37.5 
46.0 
41.7 
41.7 
HOGUE’S YELLOW DENT “LEAF AREA’’ PURE LINES AND HYBRIDS 
ORIGINAL STOCK 
The origin of these selections dates back to 1905. In that 
year a large number of ordinary wind fertilized Hogue’s Yellow 
Dent corn plants were measured individually for leaf area and 
for dry matter. The ratio of leaf area (in square inches) to dry 
matter (in grams) was calculated as a basis for type selection. 
The ears from two plants having a low ratio of leaf area per 
gram dry matter served as the foundation for “low leaf area” 
selections, while the ears from two plants having a high ratio 
of leaf area per gram dry matter formed the foundation for the 
“high leaf area” selection. The four ears were planted indi- 
vidually in ear-to-row plats in 1906 and a number of individual 
plants of their respective types selected from the progeny for 
planting ear-to-row plats in 1907. During 1907, 1908, and 1909, 
the “low leaf area” selections were planted in one isolated group 
of ear-to-row plats while the “high leaf area” selections were 
grown in another isolated group. This permitted free pollina- 
tion between the strains selected for their respective types but 
avoided cross-pollination between the high and the low leaf area 
selections. In 1909, after three years’ continuous selection re- 
spectively for high and low ratio of leaf area to dry matter, 
