COTTON IN WEEVIL-CONTROL EXPERIMENTS 91 
The rows in this test were divided into two 100-foot sections by 
a line stretched across the field, and the weight of seed cotton was 
recorded from each section of each row. Section A includes the 
western half of the field and section B the eastern half, where the 
plants were notably larger. The weight of seed cotton and the 
number of plants are stated in Table 12. These data are also shown 
graphically in Figure 7. In comparing the yields of the four plant- 
ings the weight of seed cotton from only the four inside rows of each 
block is used., The yields of the outside rows vary to a considerable 
extent, being affected by adjoining blocks of earlier or later planted 
cotton. 
The highest yield of seed cotton was obtained from the April 19 
planting, the yields from three 4-row blocks having been 51.39, 46.62, 
and 43.81 pounds, respectively. The yields from the April 28 and 
May 5 plantings were about equal. Two blocks of the April 28 
planting yielded 35.28 and 35.21 pounds, while the May 5 planting 
Peydured 35.31 and 36.56 pounds. Very low yields were recorded 
rom the May 12 planting, the two blocks having produced only 12.06 
and 13.92 pounds of cotton, respectively. 
Consistent differences in the yield of the east and west sections of 
rows occurred in all plantings. The lower yields from the west sec- 
tion of rows were due to the presence of Johnson grass, which retarded 
the growth of plants in this part of the field. 
In the May 12 planting no thinning was done in parts of rows 
where a stand was obtained, so that the plant counts are not com- 
7 parable with those obtained from the other plantings. Though the 
ow yields of the May 12 planting may be ascribed very largely to 
the poor stand of plants, the larger proportion of bolls injured by the 
weevils was also a factor. 
The higher yields obtained from the cotton planted on April 19 
may also be ascribed, at least in part, to the smaller percentage of 
injured bolls, showing that the weevil conditions were not as severe 
during the early period of boll development. 
Nearly the same numbers of flowers and shed bolls were recorded 
from the April 19, April 28, and May 5 plantings, and the totals of 
the yields from the four 50-foot sections of rows of each planting 
from which these records were obtained were nearly the same, having 
been 12.68 pounds from the April 19 planting, 12.15 pounds from the 
planting of April 28, and 11.67 pounds from that.of May 5. Never- 
theless, the total block yields were considerably higher on the April 
19 planting. 
It seems possible that the higher yields obtained from the 50-foot 
sections of rows in the April 28 and May 5 plantings, as compared 
with the total block yields, may have been due to the fact that all 
of the weevil-infested squares were picked up under the 50-foot sec- 
tions during July for record purposes. 
The additional protection that may have been given to the 50-foot 
sections by collecting the weevil-shed squares would not render the 
yields less significant. On the contrary, the yields that were secured 
from these sections of rows may be more indicative of the results that 
might have been secured if the later plantings had been apart from 
the earliest planting and had not been subjected to the weevil infesta- 
tion from the early cotton. 
