1084 
Journal of Agr icultural Research 
Vol. XXVIII, No. 11 
2-inch spaced plants in each of the three sections of blocks No. 3 and 5. The 
2-inch led in half of the six comparisons of the first, second, and total pickings. 
While the total yields recorded from blocks No. 3, 4, and 5 show that the 
2-inch spaced plaints outyielded the 12-inch spacing, the yields of the different 
sections of the 2-inch spaced blocks were not consistently higher than correspond¬ 
ing sections of 12-inch spacing. The three sections of block No. 4, where plants 
were spaced 12 inches, yielded 65.2, 69.5, and 111.2 pounds, respectively, giving 
a total of 245.9 pounds. In block No. 3, 2-inch spacing, the yields of sections 
A and C were less than those of the corresponding sections in block No. 4, and 
in block No. 5, 2-inch spacing, the yield of section C was less than that of the 
same section in block No. 4. But the total yields of blocks No. 3 and 5 were 
248.9 and 253.0 pounds, respectively, the increase above the yield of 12-inch 
spacing being 3 pounds and 7.1 pounds, respectively. 
Summarizing the total yields, the average yield of the three 2-inch blocks is 
found to be 252.8 pounds, while the yield of the 6-inch block is 246.3 pounds, 
and the 12-inch block 245.9 pounds, showing an increase of 3.2 per cent of 2-inch 
over 6-inch, and 2.8 per cent of 2-inch over 12-inch spacing. 
However, these increases in the yield of 2-inch over 6- and 12-inch spaced plants, 
though rather consistent, are very small and an examination of Table I and figure 
1 will show that there was considerable variation in the row yields. In order to 
compare the yields of the different spacings as a whole, the average yield of 25 
feet of each section of each row was computed. This gave 12 yields in each block 
to calculate the mean yield of 25 feet of row length. These determinations 
follow in Table II. 
The difference between the blocks in the average yield of 25 feet of row is so , 
small that no significant difference can be shown between the different spacings 
As there is no significant difference between the three 2-inch blocks they can be 
treated as one array, showing the mean yield of 25 feet of the 2-inch spacing to be 
4.1683 ±0.0485 pounds, calculated on 36 cases, while the mean yield of 25 feet 
of 6-and 12-inch spacing are 4.051 ±0.083 and 4.059±0.118 pounds, respectively. 
Even with the lower probable error of the new mean of the 2-inch spacing no 
significant difference between any of the spacings can be found. Under the con¬ 
ditions of the experiments a difference of only 7.5 per cent would have been 
significant, but as the increase of 2- over 6-inch spaced plants was only 3.2 per cent 
and 2- over 12-inch spaced plants only 2.8 per cent, the different spacings must 
be regarded as yielding the same, and from a biometric standpoint there would 
be no assurance that the results would stand in the same order if the experiment 
were repeated under the same conditions. 
The yields secured from this experiment show that plants spaced as close as 2 
inches in the row yielded as well as the wider-spaced plants, indicating that no 
matter what the spacing the yields tend to be the same under the irrigated, long- 
season conditions of the Coachella Valley. It should also be noted that all blocks 
gave good yields, the highest, a 2-inch spaced block, yielding at the rate of 
1,958.56 pounds of seed cotton or about 653 pounds of lint per acre. 
