Experimental Error in Crop Tests 
21 
plats. A similar comparison was also made between Turkey 
Red and Nebi'aska No. 28 winter wheat. 
Turkey Red is the standard bearded hard winter variety 
for normal Nebraska conditions, while Big Frame is one of 
the best beardless varieties of rather similar growth habits. 
The Nebraska No. 28 is an early wheat ripening about ten 
days before Turkey Red, and is normally six inches shorter. 
The relative growths of these varieties differ somewhat in 
different years according to their response to varying cli- 
matic conditions. This will account for one variety outyield- 
ing in one season, and another variety in a different season. 
For example, in 1913 the Nebraska No. 28 wheat grew fully 
as tall as Turkey Red, because it had attained its maximum 
height before dry weather set in, which somewhat stunted the 
more slowly developing Turkey Red wheat. The season of 
1914 was more favorable for the Turkey Red wheat, which 
produced a normal, relatively greater vegetative growth. 
Table 4 gives the two years' results with Turkey Red 
and Big Frame wheat. When grown in alternating single 
rows in 1913, the Big Frame yielded 7 per cent more grain 
than the Turkey Red wheat, while in alternating five-row 
plats, the Big Frame yielded 3 per cent less than the Tur- 
key Red. Due to competition, the Big Frame yielded rela- 
tively 10.3 per cent too high in single-row plats. 
In 1914, the Big Frame yielded 85 per cent as much 
grain as Turkey Red when compared in alternating one-row 
plats, while it yielded 97 per cent as much in five-row plats. 
Competition in rows with Turkey Red caused the Big Frame 
to yield relatively 12.4 per cent too low. 
The straw yields for 1914 give results similar to those 
for grain. In alternating rows the ratio of Turkey Red to 
Big Frame straw yields was 100:90. In five-row plats this 
ratio was 100:97. 
Table 5 gives the relative yields of Turkey Red and Ne- 
braska No. 28 wheat during 1913 and 1914. The ratio of 
Turkey Red to Nebraska No. 28 grain yield was 100:107 in 
1913, both when grown in alternating single-row plats and 
alternating five-row plats. The growth of the two varieties 
this year was so similar that competition appears to have 
been a negligible factor. 
In 1914 the Nebraska No. 28 yielded 63 per cent as much 
as the Turkey Red when compared in alternating single-row 
plats, while it yielded 85 per cent as much in alternating 
