14 BULLETIN 1473, U. S. DEPARTMENT OF AGRICULTURE 
On fertile soil with ample moisture the unusually large number of 
plants left in the unthinned rows probably would have developed into 
slender “whips” and borne little fruit. As it happened, however, the 
season was very dry and the plants were held in check, so that at 
ke they were scarcely 24 inches in height. (Table 6 and 
2. 6 
There is considerable fluctuation in the row yields and block yields 
in both pickings. There appears to be a tendency for the unthinned 
blocks to produce less cotton in the first Picking than the 6-inch 
spacings. 
Comparing the yields from the inside rows of the unthinned blocks 
with those of the 6-inch spacings, the latter gave the highest yields 
in two out of four cases. The 6-inch spacing gave higher yields than 
the 12-inch in two out of four comparisons. In one comparison they 
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Fig. 6.—Yields (in pounds) of seed cotton per row from comparison of 6-inch and 12-inch spacings - 
and unthinned rows in experiment B, at Greenville, Tex., 19 
produced the same, and in the fourth the 12-inch spacing was high- 
est. In the three comparisons of unthinned blocks with 12-inch 
spacing the unthinned gave the highest yield in each case. 
Comparing yields of the unthinned rows with the 6-inch spacing 
there is a mean difference of 0.30+0.541 pound in favor of the two 
inside rows of the 6-inch spacing. The difference is slight and is not 
significant. Comparing yields from the two inside rows of the 6-inch 
and 12-inch spacings, there is a mean difference of 0.225+0.293 in 
favor of the 6-inch one, which is not significant. Since there are 
only three comparisons between the 12-inch and the unthinned rows, 
mean differences were not calculated, but the unthinned blocks have 
produced more cotton in each case. 
The yield relations of the different spacings are shown in Figure 6, 
and the size and fruiting habits of the plants from the different spac- 
ings of the experiment are shown in Plate 2 
e° 
