14 



Journal of Agricultural Research 



Vol. xir, No. I 



Table III. — Percentage composition of Big Stem sweet potatoes in the ground during 

 the latter part of the growing season — Continued 



Date. 



Oct. 30 



Nov. 



Nov. 13 



Nov. 20 



Nov. 27 



Sweet potato No. 



f3i 



32 



3Z 



34 



35 



Average 



36 



37 



38 



39 



40 



Average 



41 



42 



43 



44 



U5 



Average 



[46 



47 



48 



49 



^50 



Average 



5i---- 



52 



53 



54 



155 



Average 



Mois- 

 ture. 



77 



75 



78 



77 



78 



99 



14 



78 



78.93 



On the basis of dry matter. 



Starch. 



64, 



63 



55 



SO' 



65 



58 



27 



73 



46. 20 



Cane 

 sugar. 



10. 65 

 11.77 

 10. 56 

 14.47 

 8.76 



II. 24 



14.65 



14- 15 

 14.44 

 11.82 

 13-67 



13-75 



15.24 

 18.56 

 18. 20 

 20. 08 

 19-93 



lb. 40 



20. 99 



25-31 

 19.72 

 25. 16 

 24-39 



23. II 



Reduc- 

 ing 

 sugar 

 as glu- 

 cose. 



2.87 

 2.81 



2. 91 

 4.24 

 2.98 



3- 16 



3-40 

 2.68 



2-95 

 1.86 

 2.58 



2. 69 



2-59 

 2.99 



2-45 



3-40 

 5-03 



3-29 



3-30 

 3- 75 

 2.79 



3-41 

 2. 76 



3- 20 



28. 10 

 26.59 

 26. 61 



25-52 

 23.48 



26. 06 



5.08 

 3.60 

 4.04 

 3.61 

 2. 91 



3-85 



Total 

 carbo- 

 hy- 

 drates. 



79 



80, 



76 



77 



05 



19 



96 



03 



76. II 



On the basis of fresh 

 material. 



Starch. 



15-07 

 14-37 

 14-57 

 12. 67 

 15.22 



14.38 2 



Cane 

 sugar. 



14.97 

 15-51 

 14.49 

 16.44 



14.95 



15-27 



13.09 



11-95 

 13.06 

 10. 91 

 11-54 



12. 06 

 10. 04 

 13-30 

 9. 61 

 11.56 



II. 31 



8.77 

 10. 22 



9. 00 

 10. 18 

 10.58 



9-75 



49 



29 



5-48 



Reduc- 

 ing 

 sugar 



as glu- 

 cose. 



0.66 

 .62 



•65 

 .90 

 .67 



70 



.81 

 .64 

 .69 



•47 

 .61 



.64 



•57 

 •65 

 •56 

 .72 

 I. 09 



72 



.76 



•78 

 .67 

 •70 

 •63 



71 



I. 02 



•77 

 .82 

 .78 

 .64 



An examination of Table III shows that the sweet potatoes exhibit 

 some individual fluctuation in composition, but these variations are not 

 sufficiently great to obscure the seasonal trend. They show, however, 

 that small deviations in the general contour of the seasonal changes are 

 to be expected where so small a number of individuals is examined. The 

 significant changes lie clearly outside the limits of the individual fluctua- 

 tions. The seasonal changes in the percentage of the various constitu- 

 ents of the sweet potato as shown by the table are briefly described 

 below. 



