COTTON-SPACING EXPERIMENTS 27 
plants in hills. The row yields and block yields are shown graph- 
ically in Figure 16. 
COMPARISON OF ONE PLANT EVERY 12 INCHES WITH BLOCKED-OUT ROWS 
A comparison was made of rows with one plant every 12 inches 
and rows blocked out with an 8-inch hoe, leaving the plants in clumps 
a hoe’s width apart. About half of the plants were chopped out of 
the blocked-out rows (Table 17). In 13 out of 15 comparisons of 
the two inside rows of each block, the blocked-out rows gave higher 
yields. Comparing the yields in pounds of seed cotton from the 
inside rows of the blocks of each spacing, there is a mean difference 
of 0.860 +0.148 pound in favor of the blocked-out rows. The mean 
difference corresponds to an increase of 15.7 per cent in the blocked- 
out rows, whereas the difference between the mean yields is 0.6 
pound, corresponding to an increase of about 10.9 per cent. 
TABLE 17.—Comparative ‘yields in cotion-spacing experiment with single plants 
every 12 inches and blocked-out rows, Greenville, Tex., 1925 
{The rows, which were 100 feet long, were planted Apr. 13 and thinned June 1 (when the plants were 
about 514 inches high and were bearing about seven true leaves). The first picking was Sept.4and 
the second one Oct. 17] 
| Section 1 Section 2 Section 3 
Pas. oe ie g 
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& ton (pounds) = ton (pounds) = ton (pounds) 
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