16 BULLETIN 976, U. S. DEPARTMENT OF AGRICULTURE. 
The crop of 1915 has the highest percentage of suckers. That year 
thin stands were obtained and the season was favorable for luxuriant 
growth. 
The data on erect heads include only the results for five years, from 
1914 to 1918, inclusive. During this period the proportion of erect 
heads ranged from 89.6 to 100 per cent in 10 of the 15 plats for which 
such data are recorded. In the remaining five plats it is much lower, 
ranging from 70.6 to 80.2 per cent. No one date of seeding produced 
the highest percentage of erect heads in all these years, this depend- 
ing to some extent upon conditions at heading time. It has been 
observed that more pendent heads occur when the crop is making 
very rapid growth at heading time than where normal growth only 
60 
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10 
^ /9/^ /B/S /S/G /9/7 /&/S /&/& 
Fig. 7. — Annual and average yields per acre, in bushels, of feterita 
(C. I. No. 182) in the date-of-seeding experiments at the Amarillo 
Cereal Field Station in the 6-year period from 1914 to 1919, inclusive. 
Horizontal lines show averages for the period. 
is being made. This may be explained in part by the fact that under 
conditions which promote rapid growth the sheath unfolds from 
around the peduncle before it is strong enough to support the head 
without bending. The degree of curvature of the head depends 
largely on the strength of the peduncle at the time it is released by 
the sheath. 
The height of the plants ranges from 2 to 4^ feet. The time of 
seeding apparently has little to do with the height of the plants. 
The yield is recorded in three ways: First, the total crop; second, 
the grain yield in pounds; and, third, the grain yield in bushels of 58 
pounds each. The yields are influenced by seasonal conditions to 
such an extent that no one date of seeding is best for all years and 
under all conditions. This can be studied best from Table IX, which 
