SINGLE-STALK COTTON CULTURE AT SAN ANTONIO. 



17 



point is illustrated further in Plate VI, figures 1 and 2, which pre- 

 sent yields from rows in wide-spaced and single-stalk blocks, 

 respectively. 



General observations made throughout the season, comparing the 

 development of single-stalk and wide-spaced rows, showed how the 

 above conditions might be accounted for. Plants in the single-stalk 

 rows seemed sooner to take advantage of any inter-row or inter-plant 

 soil space and to more readily utilize the available soil moisture. On 

 this account plants in single-stalk rows may have gained an advantage 

 over adjoining wide-spaced rows early in the season and to a degree 

 have invaded the soil that would otherwise have been utilized by 

 the wide-spaced rows. This advantage would be cumulative, and 

 as the season progressed the plants in the single-stalk rows appeared 

 to show distinct superiority^ in this respect. This may also account 



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Fig. 3. — Diagram showing the yields from rows in wide-spaced and single-stalk blocks of Acala cotton in 

 section B, San Antonio, Tex., 1914. Wide-spaced rows are represented by double lines, single-stalk 

 rows by heavy lines. 



for the greater differences in the yields obtained from the alternate 

 rows of section A. 



Because of the effect of single-stalk rows on wide-spaced rows 

 throughout the test, it is necessary to compare the inside rows of the 

 4-row blocks of section B in order to learn the differences that might 

 be expected if the planting had been made upon a field basis. 

 It is found by doing this that the inside rows of single-stalk blocks 

 yielded from 15 to 60 per cent more seed cotton than the inside 

 rows of the wide-spaced blocks. The average difference is 47.7 per 

 cent. 



