COTTON IN WEEVIL-CONTROL EXPERIMENTS 5 
at weekly intervals thereafter. While this method did not give the 
actual date of appearance of the first floral bud on each plant, the 
beginning of the fruiting stage of the plants may be determined with 
sufficient accuracy from the first week when the presence of squares 
was recorded. Table 2 shows the 
date when squares were first re- SAC7IOWV A SEC7TIOV ZS 
corded in each planting, together 
with the average height, number 
of nodes,! and the average number VO OME PEANTEDP? USP 
of squares formed. 
A more vigorous growth of seed- 
lings in the later plantings is shown 
by these records. The rate of 
erowth increases with each later 
planting, the rate of formation of 
nodes on the axis being more rapid, 
while the length of the internodes 
also increases. The faster devel- 
opment of nodes reduces the in- 
terval between planting and the 
appearance of the first squares. 
The more rapid formation of 
nodes on plants of the later plant- 
ings probably was due to higher 
temperatures during the early 
stages of growth. Seedlingsinthe L : 
later plantings did not encounter ee bubpes eo 
cooler weather, which may have 
checked the ; 
erowth in earlier 
CLOVE. AEE 
plantings. 
In comparing the rate of nodal 
srowth of seedlings, the period from 
ee neon of the seed to seek 
ance of squares is used. ‘Table 3 
ives ie ante when germination {| esate & LAVTED eins 
was first noted in each planting, the | 
number of days from germination = ; 
to the first record of square forma- Fic. 2.—Diagram of successive plantings of cotton 
tion, the average number of axis Ee SCHL Barc 
nodes formed during that period, and the average maximum and 
minimum temperatures for ae same period. 
CROWS. are LCV VE 
TaBLE 2.—Average development of 10 cotton plants at the beginning of the fruiting 
stage as grown in successive plantings at San Antonio on four different dates 
= Height | Number | 
Squares Pare of of nodes PETAES 
Date planted, 1923 Hts : fae plants on aye 
recorde a (centi- main 
planting meters) ae squares 
SET REE RS 2 eee a oe sae ae gL ae eae oe | June 1 43 Zed 6.5 2. 2 
Bineseie arm at ere VT ge TRE ea) | June 8 4] 23.4 7a 2.8 
LF REC See Roe eee 2 ee ae at Hao seb. i 34 22. 6 6.2 1.9 
Jun 5.9 17 
Ret hese tee ea ee core eee CN eS PARE | June 15 34 24. 4 
