4 BULLETIN 1320, U. S. DEPARTMENT OF AGRICULTURE 
200 feet in length and were spaced 4.1 feet apart. (The location of 
this test with relation to other cotton plantings on the experiment 
farm is shown in Figure 1, and the planting diagram of the test is 
shown in Figure 2. 
Conditions were favorable for the germination of the seed in the 
first three plantings, and good stands were obtained. Dry weather, 
following rains which occurred during the last week in April, dried 
out the soil to a considerable depth, and a stand of about 30 per cent 
resulted irom the planting of May 12, the remainder of the seed lying 
in the ground until germinated by a rain on May 30. The seedlings 
produced from the seed that germinated first grew rapidly and pro- 
duced vigorous plants. The moisture supply in the surface soil was 
inadequate to support growth of the seeds that germinated late, and 
ne of the resulting seedlings died or remained stunted throughout 
the season. 
0. 
TESTS OF COTTON EROS TEST OF 
FLANTED APRIL EY 
TESTS OF 
COTTON SCOLGHO/T 
PLANTED 
AVRIL EF 4 N 
PLATS OF 
COTTON 
APAIL 1/2 
POTAT/ION 
SCALE, /"= 300° 
FALLOW CRASS 
a4 
Minahe sr 
Fic. 1.—Diagram of part of the United States San Antonio Field Station, showing the location of successive 
plantings and the separate late-planting test of cotton with relation to other cotton plantings 
The first three plantings were thinned to two plants in a hill with — 
the hills 12 inches apart. Thinning was done by hand in order to | 
obtain as regular spacing as possible. The fourth planting was not 
thinned, as the poor stand rendered this unnecessary. 
The April 19, April 28, and May 5 plantings were thinned on May 
25, June 4, and June 8, respectively. At the time of thinning, the 
plants in the first two plantings had from five to seven true leaves 
and averaged about 20 centimeters in height. The plants in the 
third planting were slightly larger when thinning was done, averaging” 
22.5 centimeters in height and having from six to eight true leaves. | 
\ 
GROWTH RATE OF SEEDLINGS ~ 
In order to compare the rate of development during the seediing 9 
stage, the height and number of nodes on 10 representative plants in §j 
each planting were recorded when the first floral buds, or squares, 9 
appeared. ‘The plants in each planting were examined on June 1 and § 
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