38 BULLETIN 1473, U. S. DEPARTMENT OF AGRICULTURE 
The yields from this experiment are also shown” graphically in 
Figure 17. There is wide variation in the row yields, but the more 
Le productive na- 
ture of the rows 
with the greater 
number of plants 
is very evident. 
COMPARISON OF 
UNTHINNED AND 
BLOCKED -OUT 
ROWS 
With one ex- 
ception, the 1925 
experiments were 
comparisons of 
thinned rows 
with a closer 
spacing. The 
last experiment 
was acomparison 
of two close spac- 
ingsin unthinned 
and blocked-out 
rows. Theplants 
in the unthinned 
rows averaged 
2 to 3 inches 
apart, but in the 
blocked-out rows 
they were about 
6 inches apart. 
(Table 18.) In 12 
of the 15 compar- 
isons the two in- 
siderowsfromthe 
unthinned blocks 
gave the high- 
est yields. In 
one comparison 
the yield was 
equal, and in 
two cases the 
blocked-out rows 
gave higher 
yields. 
Considering 
yields in pounds 
of seed cotton 
from the two in- 
side rows of each 
block of each 
spacing, there is 
THINNED O07 7HINWNLO OF17 FHIMALD ClO7 a mean difter- 
Fig. 18.—Yields (in pounds) of seed cotton per row from comparison of 
unthinned and blocked-out rows Greenville, Tex., 1925 ence of 0.546 Ss 
POUNDS FL ROW 
PPOLNOS PLR COL 
POUNDS PEK RO 
