- 5 - 



(Editor's Note: In the Northeast, where the plum curculio is a. severe 

 problem, this program would not be advisable for two reasons; (1) under 

 our eonditions, a Calyx (petal fall) spray is needed for curculio and 

 (2) Gutliion is not as effective as dieldrin under curculio conditions 

 encountered in some of our orchards.) 



*************** 



CARBON DIOXIDE UPTAKE OF STORED LIME 



William J. Lord, Dept. of Plant and Soil Sciences 



and 

 Bertram Gersten, Feed and Fertilizer Control Service 



Is lime that has been stored of value for carbon dioxide (CO2) re- 

 moval from CA storages? In an effort to find an answer to this question, 

 lime samples from bags obtained in the fall of 196^1, but not used in a 

 lime scrubber during the 1964-1965 storage season, were analyzed in 

 September, 1965. 



Even though the CO^ content of air is very slight (0.025%), it is 

 apparent in Table 1 that considerable uptake of CO^ occurred over a 

 1-year period. Also, as one would suspect, the CO2 content of the outer 

 portions of lime in the bag was greater than that of a composite lime 

 sample from the entire contents of the bag. 



Table 1. Carbon dioxide content of lime in September, ige^, and after 

 approximately 1 year storage in packing shed. 



Lime" 



Carbon dioxide content of lime 



Composite sample 

 Sept. 1961+ 



Composite sample 

 Sept. 1965 



Sample of periphery 

 of bag contents 

 Sept. 1965 



0/ 





% 



m- 



9.7 



20.3 



A 

 A 

 B 

 B 

 C 

 D 



1.4 

 1.4 

 1.6 

 1.6 

 6.2 

 2.1 



7.9 

 5.9 

 7.0 

 3.8 

 8.0 

 8.0 



21.5 

 25.4 

 20.4 

 9.2 

 20.0 

 12.6 



There were 3 bags oi Lime A, 2 of Lime B, and ] each of Limes C and D. 



