1090 
Journal of Agricultural Research 
Vol. XXVIII, No. 11 
The comparisons show that in the first picking the different spacings gave about 
the same yield, and that 2-inch spaced plants outstripped the wider spaced plants 
in the second picking, which gave the 2-inch spaced plants a greater total yield. 
Comparisons of the total block yields show that the two blocks of 12-inch 
spaced plants were outyielded by three adjacent blocks of 2-inch spaced plants 
15.1, 9.9, and 8.6 per cent, respectively. The increase of 2-inch over 6-inch 
spaced blocks was not so great. The two blocks of 6-inch spaced plants 
were outyielded by three adjacent blocks of 2-inch spaced plants 3.8, 8.5, 
and 3.5 per cent, respectively, but in one instance (block No. 8) an adjacent 
block of 2-inch spacing gave a decrease of 0.8 per cent. However, the mean yield 
of the four 2-inch spaced blocks is 315.67 pounds, of the two 6-inch blocks 304.25 
pounds, and of the two 12-inch blocks 282.35 pounds, showing an increase of 
3.7 per cent of 2-inch over 6-inch spaced plants, 11.8 per cent of 2-inch over 12- 
inch spaced plants, and an increase of 6-inch over 12-inch spaced plants of 7.8 
per cent. 
All spacings, however, gave good yields, the average production of the 2-inch 
spacing being at the rate of 2,651 pounds of seed cotton, or about 883 pounds of 
lint, which is a little over a bale and three-quarters per acre. 
There are four rows 123.5 feet long in each of the three sections of each block, 
and mean yields of the first, second, and total picking of the twelve 123.5-foot 
rows in each block are given in Table IV. 
Table IV.— Mean yield of twelve 123.5-foot row sections of blocks of 2-, 6-, and 
12-inch spaced plants , Coachella Valley , Calif., 1923 
Block 
No. 
Spacing 
First 
picking 
Second 
picking 
Total yield 
1 
12-inch_ .. .. ... 
Pounds 
14.56 ±0.42 
Pounds 
7.90±0.16 
Pounds 
22.48±0. 59 
2 
2-inch___ _ 
15.18db . 44 
10.68dt .36 
25.87=b . 33 
3 
6-inch______ 
16.12dh . 30 
8.79± . 34 
24.91± .29 
4 
2-inch__ _ .. . 
15. 77± . 55 
11.27± .55 
27.03± .60 
5 
12-inch____ _ 
15.87± . 26 
8. 72± . 38 
24. 59db . 37 
6 
2-inch____ _ 
14.93db . 55 
11. 79± . 54 
26. 72db . 32 
7 
6-inch_____ 
16.17± . 51 
9. 63± . 58 
25.80ab .84 
8 
2-inch________ 
16.33db .43 
9. 27± . 58 
25. 59± . 52 
In the first picking there is no significant difference between the two blocks 
of 12-inch spaced plants and any of the three adjacent blocks of 2-inch spaced 
plants, which was also the case with the two 6-inch spaced blocks in comparison 
with the four adjacent 2-inch spaced blocks. 
Neither is there any significant difference in the yield of the first picking 
between the four 2-inch blocks, between the two 6-inch blocks, or between the 
two 12-inch blocks, though the difference in the latter instance is 1.31 ±0.494 
which is almost three times the probable error. 
Since there is no significant difference between blocks of like spacing each 
spacing can be treated as one array, but even with the reduced probable errors 
secured in this way there is no significant difference between any of the spacings 
in the yield of the first picking. 
In the second picking 2-inch blocks showed increases in yield over adjacent 
12-inch blocks of 2.78 ±0.394, 2.55 ±0.667, and 3.07 ±0.66 pounds, all of which 
are considered significant differences, being 7.06, 3.83, and 4.65 times the prob¬ 
able error respectively. 
The increase in yield of 2-inch spaced blocks over adjacent 6-inch blocks of 
the second picking was not so great as the increase over 12-inch spaced blocks. 
The differences in favor of the 2-inch are 1.90±0.495, 2.49±0.647, and 2.16± 
0.792 pounds. The first two differences are to be considered significant as they 
are 3.84 and 3.85 times the probable error, but the last one in only 2.73 times 
