New York AGRICULTURAL EXPERIMENT STATION. 101 
Comments on the table.—A study of the above table reveals the 
following: (1) In each of the five sections the five-sprayed row 
yielded more than the three-sprayed row, the difference varying 
from 31 to 55 bushels per acre. _ 
(2) In each section the sprayed rows yielded more than twice 
as much as the unsprayed row. The five-sprayed row outyielded 
the adjacent unsprayed row by 203 to 252 bushels per acre. 
(3)In different sections the yields of rows treated in the 
Same way varied considerably. The yield of the unsprayed rows 
varied from 141 to 161 bushels per acre; on the rows sprayed three 
times it varied from 324 to 365 bushels per acre; and on the rows 
sprayed five times from 360 to 405 bushels. When it is considered 
that the rows of each series were treated in all respects in the 
Same way as nearly as possible it is plain that these variations in 
yield must have been due to slight variations in the soil in differ- 
parts of the field, although it is not known why such soil 
variations should exist. They were not evident to the eye. There 
were neither dead furrows nor back furrows in the field and the 
soil appeared uniform. It is obvious that confidence should be 
placed only in averages. 
(4) Another interesting fact brought out in the table is the 
smaller quantity of culls on the sprayed rows in each section. 
On the average there were less than half as many culls on the 
sprayed rows as there were on the unsprayed. Owing to the 
premature death of the unsprayed plants many tubers on those 
rows did not finish their growth, 
Yield by series.—The five rows sprayed three times constitute 
Series I and the average yield of these five rows makes the yield 
of Series I. The yields given for Series II and III have been 
computed in the same manner. The yield by series is shown in 
the following table: 
TaBLE VI.—YIELD BY SERIES AT GENEVA. 



SERIES. Rows. Dates of spraying. Yield per acre. 
‘ Bu. lbs 
| Ee a ee Freee Seek O SAL nes UY 1G, 72k AU CAUE RL alent onans & ais 344 30 
iE aS acs Seen 2 O Selene t4agae | Jy Ss, 2a ANoe dl) ol brand 29 aces 386 40 
Re een. eo. On y a 2eanch. Low, ian) UNSpPrayed eames he ose eee etre Be 153 25 



Increase in yield due to spraying three times, 191 bu. per acre. 
Increase in yield due to spraying five times, 233 bu. per acre. 
