EXPERIMENTS WITH SINGLE-STALK COTTON CULTURE. 



29 



materially with the size of the seed if the abundance of lint on the 

 surface of the seed remained constant. Conversely, if the abundance 

 of lint were not constant, the lint percentages might appear uniform 

 even though the size of seed varied considerably. Thus it is desir- 

 able to know whether the size of seed and the amount of lint per seed 

 were affected by single-stalk culture. The weight in grams of 100 

 seeds taken from each of the samples discussed in connection with 

 Table XXII is shown in Table XXIII, together with the lint indexes, 

 or the grams of lint on 100 seeds, of the same samples. 



Table XXIII. — Weights of 100 seeds and lint indexes (grams of lint on 100 seeds) of 

 five different varieties of cotton as determined from samples of seed cotton grown in 

 five single-stalk culture experiments with cotton conducted in Louisiana, Arkansas, 

 and North Carolina. 



Sample. 



Weight of 100 seeds (grams). 



R. K. 

 Boney. 



John 

 He- 



bert. 



J. E. 

 Tan- 

 ner. 



H. D. 

 Sloan. 



L. M. 

 San- 

 derson. 



Lint indexes= weight of lint on 100 seeds 

 (grams). 



R. K. 

 Boney. 



John 

 He- 



bert. 



J. E. 

 Tan- 

 ner. 



h. r>. 



Sloan. 



L. M. 



San- 

 derson. 



Old method: 



No. 1 



No. 2 



No. 3 



No. 4 



No. 5 



Single atalk: 



No. 1 



No. 2 



No.3 



No. 4 



No. 5 



Average:. 



Old method 

 Single stalk 



9.1 



9.7 

 9.4 

 10.2 

 9.6 



9.5 

 8.9 

 9.9 

 9.5 

 10.6 



9.7 

 9.8 

 9.7 

 9.7 

 8.9 



10.2 

 9.9 

 9.4 

 9.8 

 9.0 



12.0 

 13.1 

 12.8 

 12.6 

 13.5 



12.7 

 11.9 

 11.2 

 12.6 

 12.2 



9.7 

 9.4 

 10.2 

 10.6 

 10.3 



10.3 



9.6 



9.8 



11.1 



10.1 



12.4 

 11.2 

 11.8 

 11.7 

 12.6 



11.8 

 11.8 

 11.7 

 11.2 

 10.2 



4.9 

 5.7 

 5.1 

 5.7 

 5.9 



6.1 

 5.2 

 5.6 

 5.6 

 5.0 



5.2 

 5.1 



4.8 



5.3 

 4.9 

 4.6 

 4.8 

 4.4 



6.8 

 6.8 

 6.3 

 7.1 

 6.6 



6.3 



6.2 

 6.0 

 6.0 

 6.3 



9.60 

 9.68 



9.56 

 9.66 



12.80 

 12.12 



10.04 

 10.18 



11.94 

 11.34 



5.46 

 5.50 



4.90 

 4.80 



6.72 

 6.16 



5.7 

 5.1 

 5.7 

 5.7 

 5.5 



5.5 

 5.2 

 6.0 

 7.1 

 5.9 



5.54 

 5.94 



7.0 

 6.6 

 6.9 

 7.5 



7.4 



6.7 

 7.0 

 6.3 

 6.6 

 6.0 



7.08 

 6.52 



It will be seen from Table XXIII that, while there was con- 

 siderable variation in the weights of seed representing either of the 

 systems of culture, the average weight of 100 seeds was about the 

 same for each system. This fact, in addition to the fact that there 

 was no significant difference in the percentage of lint, would indicate 

 that the density of lint on the seeds was about the same under the 

 different systems of culture. That is, we would expect to find 

 that the weight of lint per seed did not vary significantly. The 

 figures in the second part of Table XXIII show that such was the 

 case. The lint index, or the number of grams of lint on 100 seeds, 

 is seen to vary only slightly and in direct proportion to the size of 

 seed. 



GRADE AND LENGTH OF LINT. 



Samples of lint in each of the experiments discussed in connection 

 with Tables XXII and XXIII were submitted to Mr. Fred Taylor, 

 cotton technologist of the Bureau of Markets, for a report on the 

 grade and length of the lint produced by the different systems of 

 culture. Mr. Taylor's report is embodied in Table XXIV. 



