COTTON-SPACING EXPERIMENTS 2. 5 5 
In this experiment the bolls opened early in the season, and the 
entire crop was harvested at one picking. An unusually heavy boll- 
weevil infestation destroyed most of the bolls set late in the season 
and accounts for the crop being harvested in one picking. 
A comparison of the yields, which are given in Table 1 and shown 
graphically in Figure 1, shows that the 6- “inch spacing outyielded the 
12-inch spacing. In the 7 side-by-side comparisons of the two inside 
rows the 6-inch spacings gave higher yields in 5 cases. The mean 
increase in pounds of seed cotton from the two inside rows of each 
block of the 6-inch spacing over the two inside rows of adjacent 
blocks of the 12-inch spacing is 0.828+0.240 pound, a difference of 
3.45 times the probable error. In this comparison the inside rows 
of the 6-inch spaced plants produced 18.7 per cent more seed cotton 
than the 12-inch spaced plants. . 
SPACING EXPERIMENTS IN _ 1922 
Two comparisons of unthinned rows with rows in which the plants 
were spaced 6 and 12 inches apart in the drill and one experiment 
with plantings in hills were made in 1922. 
The summer of 1922 was very dry at Greenville, the only rain of 
importance being 1.37 inches, which fell on August 7, after many 
cotton bolls were already open. Because of the very dry weather the 
plants grew to a height of only about 2 feet. 
SMe OF 6-INCH AND 12-INCH SPACINGS AND UNTHINNED ROWS 
EXPERIMENT A 
Yields from a test comparing unthinned with ete and 12-inch 
spaced plants (experiment A) are given in Table 2 and are shown 
graphically in Figure 2. 
There is considerable fluctuation in the row yields, but the tendency 
for the 6-inch spacing to produce more cotton than the 12-inch spac- 
ing and unthinned rows is evident. In five out of six comparisons 
the two inside rows of the blocks spaced 6 inches have produced 
more cotton than the two inside rows of adjoining unthinned blocks. 
The mean increase of the 6-inch spacing over the unthinned was 
0.283 +0.104 pound, which is not significant. In making a similar 
comparison of 6-inch and 12-inch spacings, the 6-inch spacing gave 
higher yields in four out of six comparisons and also shows a 
mean increase over the 12-inch spacing of 0.283+0.161 pound, 
which is not significant. In three out of four comparisons of the 
two inside rows of the 12-inch with unthinned blocks the 12-inch 
spacing produced more cotton, giving a mean increase of 0.275 
+0.159 pound over the unthinned. This difference is also small and 
not significant. . 
Yields from adjoining rows in close-spaced and wider spaced blocks 
show that the outside rows of the close-spaced blocks often gave 
higher yields than the outside rows of the wider spacing, and also 
higher yields than the inside rows of the same blocks (fig. 2). For 
this reason the outside rows are not included in comparing yields of 
the different spacings. 
Since no significant differences were obtained between the three 
spacings compared in this experiment, they may be considered as 
producing equally well. When yields are equal between thinned and 
unthinned comparisons the advantage would be in favor of the un- 
thinned rows, as a part of the cost of chopping would be saved. 
