4 BULLETIN 1473, U. S. DEPARTMENT OF AGRICULTURE 
~It may appear that the effects of the different spacings may be 
determined more accurately by increasing the number of rows in the 
blocks so that the extent of the robbing or competition between the 
rows can be ascertained. 
One of the experiments in 1923 was made with 5-row blocks, but 
different spacings yielded nearly the same, and the stands were irregu- 
lar, so that no consistent differences were detected between the inside 
and the outside rows. 
SPACING EXPERIMENTS IN 1921 
COMPARISON OF 6-INCH AND 12-INCH SPACINGS 
In 1921 a comparison was made of 6-inch with 12-inch spacing. 
The date of planting, date of thinning and size of plants at thin- 
g 
POUNDS PER ROW 
\y 
CMWCK f21WC4 E1NCH 12104 
SWCA (21WCA8 EMEA (216i 
Fic. 1.—Yields (in pounds) of seed cotton per row from comparison 
of 6-inch and 12-inch spacings, Greenville, Tex., 1921 
ning, the spacing, 
leneth of rows, num- 
ber of plants per 
row, and yields of 
seed cotton by rows 
and blocks are given 
in Table 1. The 
yields are also shown 
graphically in Fig- 
ure 1. The same 
plan will be followed 
in presenting similar 
data regarding all of 
the experiments. 
TABLE 1.—Comparative yrelds from cotton plants in 6-inch and 12-inch spacings, 
Greenville, Tex., 1921 
The rows, which were 100 feet long, were planted May 10 and thinned June 6 when the plants were 
about 6 inches high and were bearing an average of about four true leaves] 
| | 
‘ Yield of | < Pe 
es Row ; Number |, ree Row | Number | __ seed 
spacins No. | of plants bear seer SRLS No. | of plants! cotton 
pounds) | | 
i} | (pounds) 
2 1 | 210 2.8 | 1| 189 2.4 
G-ineh (block 1) -..----- Peatonied anor 35 | 6inch (block 5) -__.---- pi aa 
How dss 212 352i 4 188 | 205 
| == 
2 otal eae 818 11.8 | Otale ast ye oer Seu ee 776 10. 1 
i(esr} Pe ae 2011 1 105 | 2.5 
12-inch (block 2) ~___-_- : | 18 a | 12-inch (black: 6) 22 5 8 | Z 
[Neat 106 2.6 |: 4 103 2.0 
Dota) 28s ois ee | 430 9.4 AD Opa OA Qa Ea 424 | 8.5 
| 1 “184 | 3.0. 1 204. 3.3 
6:inch (block 3) ---_ 3 Bs 3-2 || 6-inch (block 7) --...---| A aS se 
| 198 2.4 || 4 | 197 | 3.6 
Poetal cscs pee 796 11.4 | Totalew tit OI eee Pe gre 12.7 
% 1 130 2.0 || 1,| 111 | 2.5 
12-inch (block 4) ------- eal av 2.8 || 12-inch (block 8) ------- Bee +e < 
oe 108 | 2.4 | 4 | 104 a5 
otal | uiviad 454 | 10.4 | Motake sents ee eee | 448 | 9.4 
! } oH 
eS 
