30 BULLETIN 1473, U. S. DEPARTMENT OF AGRICULTURE 
Each experiment was limited to a comparison of two spacings 
arranged in alternating 4-row blocks triplicated. The plantings in this 
series of experiments were made April 13 at the rate of 45 pounds of 
seed to the acre. The usual rate of planting is 25 to 30 pounds of 
seed, but some difficulty in obtaining good stands had been experi- 
enced in former years, and this unusually heavy rate of planting was 
made to insure a more uniform stand of plants. Also, since unthinned 
rows, or the original stand from plantings of 25 to 30 pounds to the 
acre, had shown a tendency to produce more cotton than thinned 
rows, it appeared desirable to plant more seed to the acre and to 
study the behavior of the plants under still closer spacings. 
COMPARISON OF ONE PLANT EVERY 12 INCHES WITH UNTHINNED ROWS 
In the first experiment one plant every 12 inches was compared 
with unthinned rows. (Table 14.) This test affords 15 side-by-side 
comparisons, and in every case the two inside rows of the unthinned 
blocks produced more cotton than the two inside rows of-the 
adjoining blocks, which were thinned to one plant every 12 inches. 
TABLE 14.—Comparative yields in cotton-spacing experiment with unthinned rows 
and 12-inch spacing, 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. 4 and the 
second one Oct. 8] 
Section 1 | Section 2 Section 3 
2 2 2 
q Yield of seed cot- S| Yield of seed cot- ra Yield of seed cot- 
| S ton (pounds) < ton (pounds) < ton (pounds) 
Spacing | ss = | Ss 
OF naa MH = het 
Ze) ee eee See ee eee | eee pee ee ee 
am | ou] 3 See Sue ANS sli tal Stel Sis) ie 
BS esi eo kes |e (eee ae) Seles leeds 
a | 7, Aa|} nr i= Z, aA} ne H i, a, | na, = 
1 471) 17) 1.7) 3.4] 512] 24) 0.9) 3.3) 432 2.3 0.6| 2.9 
Sages 9 l' 515 | 20 1 108 |) 808) ata 23 WA | 42.0" anol \o Sanuier ene 
Unthinned (block 1)---/) 3) 535] 9.51 1.7| 4.2| 466| 23! .9| 3.2| 437|/ 2.8] .7|] 3.5 
4 \ ag) 1.8 M24) alo nod) 263°) wesc] Bon) Manel aoe ieee ecesanl 
Gta ee ae aie 2,039 | 8.0| 7.6 | 15.6 |1,805| 9.3| 3.7 | 13.0|1,779| 97] 281] 12.5 
i Gli cml ean anys Reece ana 6. ni2s4 HG Wee On Ga mae 
One plant every 12 |}2,). 98] 1.7] 1.9) 3.61 100] 2.0 71 27\| 97! 2.2) :7| 29 
inches (blocks 2) 063th Or) 1. 9 ede 12316), 09) ages 6 le 4 Voseleocds ls ug tees 
4 100)\--2.0)| 12 2.2 | 10K 8 £7 2:9 ie tosela Saline pal aes 
Mgt alaeeseoe cleanin 328 | 7-4.| 6:d|13,8 | 308\| 7.4 | 2.31 Op)|o4ppl| Bo |e atone 
en Gon Orem cM nCpekcll anu Dace) ae 
2| 579| 1.9) 20).39 1) 4681.25 |. .8+] 3.31) 58Gb oo 7 ee seen 
Unthinned (block 3)---/) 3 | 559] 22] 1.7! 3.9| 542] 25| 16] 3.1] 549| 26| .6| 3.2 
4.1560) | 1.62.1 \e Ba7 | 48810 226-8 |orat) s0ye | asa agelaaesess 
Moyle were ue = 22 |2)342))/ 78.0 | 81/| 16.1 |1,958 | 10.6| 3.0] 13.6 |2,10831103] 28] 13.1 
it eo ra leo ee eae ni ena oes) PstralmiGa lla ose 
One plant every 12|}1/| 98] 1.0/ 14] 2.4] 103] 1.6 7/ 231 108| 19| .8| 2.7 
inches (block 4)--_-|) 3| 101] 1.5] 15] 30] 103) 1.7 Bil Dbel 1o4 e181 oS aoe 
4| lol] 16) 1.2) 28] 101]| 1.6 7( 28) Wr ie2 0) eae 
Motale esse ae _...| 400| 5.3| 64/107] 408| 65] 28) 93] 415| 771 28) 105 
1) B62) 28) ioral Sol | Ais eel eeiwaul steel eain monn ne almeraeey 
2| 542) 27) 10] 3.7 | 514] 0241. 16) 301-610) 3:0) sere 37 
Unthinned (block 5)---) 3 | 591 | 29.6] .9| 3.5) 525/ 2.1] .7| 28] 532| 26) .7| 3.3 
41 479| 2.5 9| 341 440/ 23] .9| 3:2] 570| 2.4| 19] 3.3 
OLA ewan e .---|2,104 | 10.0} 4.5 | 14.5 |1,892| 9.4] 3.2] 12.6 |2,253| 10.3] 3.1| 13.4 
1 [F992 a4 6s! Coro eogulmaieyuley as: /aoloa NEDO mn aah ReetEn anon 
One plant every 12|}2| 100| 22] .8/] 3.0] 104| 20] .7| 2:7] 102] 17] Lo] 27 
inches (block 6)---.|) 3| 101| 2.2] .8| 3.0] 102| 20] .9| 29] 102] 1.5| 1.0] 2.5 
41 109.142: 4) (5 9295) 03. 34> gots 1/8] vo |e aes | tog Alsen enine el ameoen 
Totale stots vee ....| 402 | 8.2] 31/113] 403] 7.5| 28/103] 402] 63] 3.9/ 10.2 
