Experimental Error in Crop Tests 35 
Fig. 10 — Alternating three-row plats of Hogiie's Yellow Dent and Pride 
of the North corn. 1914. Pride of the North on the right. Compe- 
tition between test plats may be avoided and correct relative yields 
obtained by discarding the outside rows of three-row plats 
In 1912 Hogue's Yellow Dent and Pride of the North 
corn were gro^\ni in alternating single rows and in alternating 
three-row plats at the rate of three plants per hill in each case. 
These were also compared for yield by growing one plant of 
each variety in the same hill. For this reason the variety 
yields per acre in the hill method are on a different basis than 
in case of the rows and blocks, but nevertheless they are com- 
parable. The three-row plat tests were replicated 10 times, 
the single row plats 20 times, and the hills 1,000 times. The 
results are contained in Table 15. 
In alternating three-row plats, Pride of the North yielded 
85 per cent as much as Hogue's Yellow Dent, while in alter- 
nating single-row plats it yielded 66 per cent as much as the 
Hogue's Yellow Dent. Within the same hill. Pride of the 
North yielded 47 per cent as much as Hogue's Yellow Dent. 
Due to competition Pride of the North yielded relatively 44.7 
per cent too low in the same hill, and 22.4 per cent too low 
in the alternating rows. 
