6 



BULLETIN 644, U. S. DEPARTMENT OF AGRICULTURE. 



pound of fiber from 10,785 to 8,089. This reduction of 2,696 seeds 

 is equal to 67 bolls of 40 seeds each, or 60 bolls of 45 seeds each, or 

 an average of 64 bolls, which means a saving* of 25 per cent in the 

 number of bolls to be picked. 



Table II- 



-Relation of the lint index to the number of seeds and of 5-locked 

 bolls required to produce 1 pound of cotton fiber. 



.Lint index. 



Required to produce 1 pound of fiber. 



Number 

 of seeds. 



Number of bolls. 



Bolls of 

 40 seeds. 



Bolls of 

 45 seeds. 



Average. 



Average 

 differ- 

 ence in 



number 

 of bolls for 



each 10 

 points 

 in lint 

 index. 



Weight of 



100 seeds, 

 the Lint 

 percent- 

 age. 

 being 33. 



4.0. 

 4.2. 

 4.4. 

 4.6. 

 4.8. 

 5.0. 



5.2. 

 5.4. 

 5.6. 

 5.8. 

 6.0. 



6.2. 

 6.4. 

 6.6. 

 6.8. 

 7.0. 



7.2. 

 7.4. 

 7.6. 

 7.>. 

 8.0. 



Total reductions due to an increise 

 of 4 grams in weight of 100 seeds. . . 



11.3:5 



in. 7-.-, 



10,295 

 9,847 

 y,437 

 9,060 



8.711 

 8,388 



8,089 

 7,S10 

 7,550 



7,306 

 7,078 

 6,s64 

 6,661 

 6,472 



6,291 

 6.121 

 5,960 



' • " 



E 



2 ; 3 

 269 

 257 

 246 

 235 

 226 



217 

 209 

 202 

 195 



182 

 176 

 171 

 166 

 161 



157 

 153 

 149 

 145 

 141 



251 

 239 

 228 

 218 

 209 

 201 



193 



1S6 

 179 

 173 

 167 



162 

 157 

 152 

 148 

 143 



139 

 136 

 132 

 129 



125 



54 



30 



Grams. 

 8.1 

 8.5 

 8.9 

 9.3 

 9.7 

 10. 1 



10.5 

 10.9 

 11.3 

 11.8 

 12.2 



12.6 

 13.0 

 13.4 

 13.8 

 14.2 



14.6 

 15.0 

 15.4 

 15.8 

 16.2 



5,653 



126 



134 



Increasing the lint index from 4 to 5 reduces the number of seeds 

 to be harvested to secure 1 pound of cotton fiber from 11,325 to 9,060, 

 or from 267 bolls to 213 bolls. Expressed in terms of bolls to be 

 picked, this is an average reduction of 54 bolls per pound of fiber. In 

 other words, a variety with a lint index of 4 will run 25.3 per cent 

 more bolls to the pound of fiber than a variety with a lint index of 5. 

 In terms of labor employed, this means that if two men are picking 

 at the same rate or number of bolls per hour, the one picking in a 

 variety having a lint index of 5 will gather the same quantity of fiber 

 in 8 hours that the other, working in a variety with a lint index 

 of 4. will gather in 10 hours. 



If a variety having a lint index of 6 be compared with one having a 

 lint index of 4, it will be seen that 90 bolls more, or 50.8 per cent, must 

 be gathered in the smaller seeded variety than in the larger seeded in 

 order to secure a pound of fiber. In the one case the laborer must 

 pick 88,500 bolls, while in the other he must gather some 133,500 bolls 

 to get a bale of lint cotton. We have seen from Tablp I that the same 



