a BULLETIN 1473, U. S. DEPARTMENT OF AGRICULTURE 
The row yields in all spacings showed some very wide fluctuations 
(fig. 9). These differences may be attributed partly to sporadic 
damage done by boll weevils, which were present in this experiment 
throughout the lat- 
ter half of the grow- 
ing season. 
Comparing the 
sum of the yields of 
the two inside rows 
from each block, the 
unthinned in five 
comparisons pro- 
duced more cotton 
than adjoining 
blocks of the 12-inch 
spacing and blocked- 
out rows. In two 
out of three compari- 
sons the 12-inch 
blocks gave higher 
yields than the 
blocked-out ones. In 
three comparisons of 
blocked-out with un- 
Fic. 9.—Yields (in pounds) of seed cotton per row from comparison thinned, the unthin- 
of 12-inch spacing and blocked-out and unthinned rows, Greenville, ned produced more 
Tex., 1923. : 
cotton in each case. 
In the only two comparisons available the unthinned blocks pro- 
duced more cotton than the 12-inch spacing. 
Since not more than three comparisons are available between the 
different spacing, mean differences have not been calculated. The 
mean row yields from the different spacings show a slight difference 
in favor of the unthinned rows, but this difference is not significant, 
and each spacing may be regarded as yielding equally well. 
AVA 
REN GES 
POUNDS PER ROW 
I JS h 
NINAAE AQ 
: SS ER! he | 
palean =| 
x N oR 
. NYS SSS EYSSSASSS 
OT 
