10 BULLETIN 1209, U. S. DEPARTMENT OF AGRICULTURE. 
of 20. For rows having 18 plants or less, however, the production 
was calculated to a basis of 20 plants. The yields on the basis of 
corrected stand have been used in all later computations. Yields of 
shelled grain calculated to a basis of 12 per cent moisture were com- 
puted from ear-corn data by the factors obtained from the shelling 
and moisture determinations. 
The relative yields were calculated according to the formula — 
actual yield , . . , , 
-^relative yield, 
( c 'py 
in which c x and c 2 are the yields of the adjacent row on each side and 
C is the total average production of the strain (or strains) planted in 
c t and c 2 . Thus, in row 2, section 1 — 
14.4 
/ U.8+1L4 v ID - D ' 
VlO.3+12.7/ 
in which 10.3 is the average actual yield of No. 201, check, and 12.7 
the average actual yield of Whatley, these being the strains grown in 
rows 1 and 3. 
The average plat yields in the summaries (Table 1) are converted 
to the ''bushels per acre" basis by multiplying by 324, the number 
of such plats in an acre, and dividing by 56, the standard bushel 
weight of corn. 
DISCUSSION OF DATA. 
The actual and relative yields agree very well, as is shown graphically 
in Figure 1. The greatest discrepancy is in the case of No. 201, F l; 
77 
75 
73 
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59 
57 
55 
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ACTUAL 
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Fig. 1.— Diagram showing the actual and relative yields of Whatley and St. Charles White corn, the 
crosses between these varieties, and successive generations of No. 201. 
which was replicated only 10 times. Even in this case the difference 
is less than twice the probable error of the actual yield. It seems, 
therefore, that the number and distribution of replications largely 
equalized the soil variation. The relative yields are to be preferred, 
both because they take more definite cognizance of soil variation and 
because of stand corrections. In rows having deficient stands the 
adjacent rows are benefited to approximately the same extent as the 
