SWEET-POTATO STORAGE STUDIES. 



15 



The sweet potatoes in the bins were kept longer than those in 

 crates. If the latter had been kept the full length of time (171^ 

 days) the shrinkage would have been a little greater, since during 

 the last month of storage the average shrinkage of the three varieties 

 at 55° to 60° F. was a little more than 1 per cent, as shown in Table 

 6. The results with the Nancy Hall are for one year only, since 



1918- 1919^ 



PERIODS OF SEVEN DAYS EACH 



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THERMOGRAPH SHEET FOR THE PERIOD A-B. 



Fig. ■''.. — Diagrams showing the temperature in the interior of the bins (solid lines) as 



compared to the temperature of the air (broken lines) in 1918-19 a< the Arlington 



rlmental Farm, Va. The upper diagram gives (he average temperature tor Hie 



storage season, by weekly periods. Th< middle diagram gives (lie sai lata by daily 



averages, in tfaese diagrams each square indicates a period of seven days. The lower 

 diagram Is a typical thermognipb sheet, in this ease for the period A-H. 



there was no bin test of (his variety in 1917-18. The shrinkage of 

 tin- v.irietv was low in both the bins and crates in 1918-10. 



RELATION OF THE TEMPERATURE IN THE BINS TO THE TEM- 

 PERATUBE OF THE SURROUNDING AIR. 



Air-soil thermographs were employed to ascertain (he differences, 

 if any, between the temperature in (he center of the bins and the 



temperature of the air in (he sioin^e house. Figure •"' and I show 



